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Chronological Publications |  Ph.D. Theses

2014, 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000, 1999, 1998, 1997, 1996, 1995, 1994, 1993, 1992, 1991, 1990, 1989, 1988, 1987 and prior years


Last update: July 2, 2014

2014

Blanch, Juan, Walter, Todd, and Enge, Per
Exclusion for Advanced RAIM: Requirements and a Baseline Algorithm
Presented January 2014 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Chen, Yu-Hsuan, Lo, Sherman, Akos, Dennis M., Choi, Myungjun, Blanch, Juan, Walter, Todd, and Enge, Per
Development of a Real-time GNSS Software Receiver for Evaluating RAIM in Multi-constellation
Presented January 2014 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Lo, Sherman, Chen, Yu-Hsuan, Segal, Ben, Peterson, Benjamin, Lilley, Robert, Erikson, Robert, and Enge, Per
Techniques for Mitigating DME Multipath to Alternative Position Navigation and Timing (APNT)
Presented January 2014 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Phelts, R.E., Blanch, J., Walter, T., and Enge, P.
The Effect of Nominal Signal Deformations on ARAIM User Performance
Presented January 2014 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Walter, Todd, Blanch, Juan, and Enge, Per
Reduced Subset Analysis for Multi-Constellation ARAIM
Presented January 2014 at the ION Institute of Navigation International Technical Meeting, San Diego, CA



2013 (Top)

Bang, Eugene, Lee, Jinsil, Lee, Jiyun, Seo, Jiwon, and Walter, Todd
Constructing Ionospheric Irregularity Threat Model for Korean SBAS
Presented April 2013 at the ION Institute of Navigation Pacific PNT Meeting in Honolulu, HI

Blanch, Juan, Walter, Todd, and Enge, Per
Results on the Optimal Detection Statistic for Integrity Monitoring
Presented January 2013 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Blanch, Juan, Walter, Todd, Phelts, R. Eric, and Enge, Per
Near Term Improvements to WAAS Availability
Presented January 2013 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Chen, Yu-Hsuan, Lo, Sherman, Akos, Dennis, De Lorenzo, David, and Enge, Per
Validation of a Controlled Reception Pattern Antenna (CRPA) Receiver Built from Inexpensive General-purpose Elements During Several Live Jamming Test Campaigns
Presented January 2013 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Chen, Yu-Hsuan, Lo, Sherman, Akos, Dennis, Wong, Gabriel, and Enge, Per
A Testbed for Studying Automatic Dependent Surveillance Broadcast (ADS-B) Based Range and Positioning Performance to Support Alternative Position Navigation and Timing(APNT)
Presented September 2013 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

Lee, Chaiwei, Chen, Yu-Hsuan, Wong, Gabriel, Lo, Sherman, and Enge, Per
Multipath Benefits of BOC vs. BPSK Modulated Signals Using On-Air Measurements
Presented January 2013 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Lo, Sherman, Chen, Yu-Hsuan, Enge, Per, Peterson, Benjamin, Erikson, Robert, and Lilley, Robert
Distance Measuring Equipment Accuracy Performance Today and for Future Alternative Position Navigation and Timing (APNT)
Presented September 2013 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

Phelts, R. Eric, Wong, Gabriel, Walter, Todd, and Enge, Per
Signal Deformation Monitoring for Dual-Frequency WAAS
Presented January 2013 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Pullen, Sam, Enge, Per, and Lee, Jiyun
Local-Area Differential GNSS Architectures Optimized to Support Unmanned Aerial Vehicles (UAVs)
Presented January 2013 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Pullen, Sam
Managing Separation of Unmanned Aerial Vehicles Using High-Integrity GNSS Navigation
Presented February 2013 at the ENRI International Workshop on ATM/CNS (EIWAC 2013), Tokyo, Japan

Pullen, Sam, and Lee, Jiyun
Guidance, Navigation, and Separation Assurance for Local-Area UAV Networks: Putting the Pieces Together
Presented April 2013 at the ION Institute of Navigation Pacific PNT Meeting in Honolulu, HI

Pullen, Sam, and Enge, Per
Using Outage History to Exclude High-Risk Satellites from GBAS Corrections
Published in Navigation, Vol. 60, No. 1, Spring 2013, pp. 41-51

Pullen, Sam, Enge, Per, Shaw, Stuart, Frey, Charles, Frye, John, and Souder, Michael
The Impact of GPS Modernization on Standalone User Performance and Integrity with ARAIM
Presented September 2013 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

Ramakrishnan, Shankararaman, Reid, Tyler, and Enge, Per
Leveraging the L1Composite Signal to enable autonomous navigation at GEO and beyond
Presented September 2013 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

Reid, Tyler, Walter, Todd, and Enge, Per
L1/L5 SBAS MOPS Ephemeris Message to Support Multiple Orbit Classes
Presented January 2013 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Reid, Tyler, Walter, Todd, and Enge, Per
Qualifying an L5 SBAS MOPS Ephemeris Message to Support Multiple Orbit Classes
Presented September 2013 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

Walter, Todd, Blanch, Juan, Choi, Myungjun, Reid, Tyler, and Enge, Per
Incorporating GLONASS into Aviation RAIM Receivers
Presented January 2013 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Walter, Todd, Blanch, Juan, and Enge, Per
Implementation of the L5 SBAS MOPS
Presented September 2013 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN



2012 (Top)

Azoulai, L., Neri, P., Milner, C., Macabiau, C., and Walter, T.
SBAS Error Modeling for Category I Autoland
Presented September 2012 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

Bang, E., Lee, J., Seo, J., Pullen, S., and Close, S.
Automated Ionosphere Front Velocity Estimation Algorithm for Ground-Based Augmentation Systems
Presented January 2012 at the ION Institute of Navigation International Technical Meeting, Newport Beach, CA

Blanch, Juan, Walter, Todd, and Enge, Per
Optimal Positioning for Advanced RAIM
Presented January 2012 at the ION Institute of Navigation International Technical Meeting, Newport Beach, CA

Blanch, Juan, Walter, Todd, and Enge, Per
Satellite Navigation for Aviation in 2025
Published in Proceedings of the IEEE, Vol. 100, Special Centennial Issue, pp.1821-30

Blanch, Juan, Walter, Todd, Enge, Per, Lee, Young, Pervan, Boris, Rippl, Markus, and Spletter, Alex
Advanced RAIM User Algorithm Description: Integrity Support Message Processing, Fault Detection, Exclusion, and Protection Level Calculation
Presented September 2012 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

Borowski, H., Isoz, O., Eklöf, F.M., Lo, S., and Akos, D.
Detection of False GNSS Signals Using AGC
Published by GPS World in April 2012

Chen, Yu-Hsuan
A Study of Geometry and Commercial-Off-The-Shelf (COTS) Antennas for Controlled Reception Pattern Antenna (CRPA) Arrays
Presented September 2012 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

Chen, Y-H., Juang, J-C., Seo, J., Lo, S.C., Akos, D.M., De Lorenzo, D.S., and Enge, P.
Design and Implementation of Real-Time a Software Radio for Anti-Interference GPS/WAAS Sensors
Published in Sensors, No. 12, pp. 13417-40, 2012

Chu, Jiangping
Mixed One-way and Two-way Ranging to Support Alternative Position Navigation and Timing
Presented September 2012 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

De Lorenzo, David, Rife, Jason, Lo, Sherman, and Enge, Per
Calibrating adaptive antenna arrays for high-integrity GPS
Published by GPS Solutions, Vol. 16, No. 2, pp. 221-30, DOI 10.1007/s10291-011-0224-x

Gao, Grace Xingxin, Gunning, Kazuma, Walter, Todd, and Enge, Per
Impact of Personal Privacy Devices for WAAS Aviation Users
Presented September 2012 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

Heng, Liang, Gao, Grace X., Walter, Todd, and Enge, Per
Statistical Characterization of GLONASS Broadcast Clock Errors and Signal-In-Space Errors
Presented January 2012 at the ION Institute of Navigation International Technical Meeting, Newport Beach, CA

Heng, Liang, Gao, Grace X., Walter, Todd, and Enge, Per
Automated Verification of Potential Signal-In-Space Anomalies Using Ground Observation Data
Presented May 2012 at the IEEE/ION Position Location and Navigation Symposium (PLANS), Monterey, CA

Heng, Liang, Gao, Grace X., Walter, Todd, and Enge, Per
GLONASS Signal-in-Space Anomalies Since 2009
Presented September 2012 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

Heng, Liang, Gao, Grace X., Walter, Todd, and Enge, Per
GPS Signal-in-Space Integrity Performance Evolution in the Last Decade: Data Mining 400,000,000 Navigation Messages from a Global Network of 400 Receivers
Published in IEEE Transactions on Aerospace and Electronic Systems, Vol. 48, No. 4, Oct 2012

Kim, M., Lee, J., Pullen, S., and Gillespie, J.
Data Quality Improvements and Applications of Long-Term Monitoring of Ionospheric Anomalies for GBAS
Presented September 2012 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

Lee, J., Jung, S., Kim, M., Seo, J., Pullen, S., and Close, S.
Results from Automated Ionospheric Data Analysis for Ground-Based Augmentation Systems (GBAS)
Presented January 2012 at the ION Institute of Navigation International Technical Meeting, Newport Beach, CA

Lo, Sherman, and Enge, Per
Signal Structure Study for a Passive Ranging System using Existing Distance Measuring Equipment (DME)
Presented January 2012 at the ION Institute of Navigation International Technical Meeting, Newport Beach, CA

Narins, Mitch and Lo, Sherman
The Benefit of Alternative Position, Navigation, and Timing (APNT) to Aviation and Other User Communities for Precise Time and Frequency Services
Published by Proceedings of the Integrated Communications Navigation and Surveillance (ICNS) Conference in Alexandria, VA, April 2012

Narins, Mitch and Lo, Sherman
The Need for a Robust Precise Time and Frequency Alternative to Global Navigation Satellite Systems
Presented September 2012 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

Pullen, Sam, Gao, Grace, Tedeschi, Carmen, and Warburton, John
The Impact of Uninformed RF Interference on GBAS and Potential Mitigations
Presented January 2012 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Pullen, Sam, and Gao, Grace X.
GNSS Jamming in the Name of Privacy: Potential Threat to GPS Aviation
Published by Inside GNSS March, April 2012

Seo, Jiwon, Lee, Jiyun, Pullen, Sam, Enge, Per and Close, Sigrid
Targeted Parameter Inflation Within Ground-Based Augmentation Systems to Minimize Anomalous Ionospheric Impact
Published in Journal of Aircraft, Vol. 49, No. 2, March/April 2012

Sundlisaeter, Tale, Reid, Tyler, Johnson, Christopher, Wan, Stephanie
GNSS and SBAS System of Systems: Considerations for Applications in the Arctic
Presented October 2012 at the 63rd International Astronautical Congress, Naples, Italy.

Walter, et al.
Innovation: Ionospheric Scintillations
Published in GPS World, April 2012

Walter, Todd, Blanch, Juan, and Enge, Per
A Framework for Analyzing Architectures that Support ARAIM
Presented September 2012 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

Walter, Todd, Blanch, Juan, and Enge, Per
L1/L5 SBAS MOPS to Support Multiple Constellations
Presented September 2012 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN

Walter, Todd
GNSS Augmentations: When A Signal in Space Isn't Enough
Published in Inside GNSS, September/October 2012

Wong, Gabriel, Chen, Yu-Hsuan, Phelts, R. Eric, Walter, Todd, and Enge, Per
Measuring Code-Phase Differences Due to Inter-Satellite Hardware Differences
Presented September 2012 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Nashville, TN



2011 (Top)

Blanch, Juan, Walter, Todd, and Enge, Per
Optimization of a Vertical Protection Level Equation for Dual Frequency SBAS
Presented January 2011 at ION Institute of Navigation International Technical Meeting in San Diego, CA

Blanch, Juan, Walter, Todd, and Enge, Per
A Clock and Ephemeris Algorithm for Dual Frequency SBAS
Presented September 2011 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Blanch, Juan, Walter, Todd, Enge, Per, Waller, Stefan, Fernandez, Francisco, Dellago, Riccardo, Ioannides, Pervan, Boris, Hernandez, Ignacio, Belabbas, Boubeker, Spletter, Alexandru, and Rippl, Markus
A Proposal for Multi-Constellation Advanced RAIM for Vertical Guidance
Presented September 2011 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Chen, Yu-Hsuan, Juang, Jyh-Ching, De Lorenzo, David, Seo, Jiwon, Lo, Sherman, Enge, Per, and Akos, Dennis
Real-Time Dual-Frequency (L1/L5) GPS/WAAS Software Receiver
Presented September 2011 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Choi, Myungjun, Blanch, Juan, Walter, Todd, and Enge, Per
Advanced RAIM Demonstration using Four Months of Ground Data
Presented January 2011 at ION Institute of Navigation International Technical Meeting in San Diego, CA

Choi, Myungjun, Blanch, Juan, Akos, Dennis, Heng, Liang, Gao, Grace, Walter, Todd, and Enge, Per
Demonstrations of Multi-Constellation Advanced RAIM for Vertical Guidance Using GPS and GLONASS Signals
Presented September 2011 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Gao, Grace X., Heng, Liang, Walter, Todd, and Enge, Per
Breaking the Ice: Navigation in the Arctic
Published by Inside GNSS Magazine, Vol. 6, No. 5, pp. 60-64, Sept/Oct 2011

Heng, Liang, Gao, Grace, Walter, Todd, and Enge, Per
Statistical Characterization of GPS Signal-In-Space Errors
Presented January 2011 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Heng, Liang, Gao, Grace, Walter, Todd, and Enge, Per
Statistical Characterization of GLONASS Broadcast Ephemeris Errors
Presented September 2011 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Heng, Liang, Gao, Grace X., Walter, Todd, and Enge, Per
Digging into GPS Integrity: Charting the Evolution of Signal-in-Space Performance by Data Mining 400,000,000 Navigation Messages
Published by GPS World, Vol. 22, No. 11 pp. 44-9, November 2011

Lee, Jiyun, Jung, Sungwook, and Pullen, Sam
Enhancements of Long Term Ionospheric Anomaly Monitoring for the Ground-Based Augmentation System
Presented January 2011 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Lee, Jiyun, Seo, Jiwon, Park, Young Shin, Pullen, Sam, and Enge, Per
Ionospheric Threat Mitigation by Geometry Screening in Ground-Based Augmentation Systems
Published in Journal of Aircraft, 2011

Lo, Sherman, and Enge, Per
Capacity Study of Two Potential Alternative Position Navigation and Timing (APNT) Technologies for Aviation
Presented January 2011 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Lo, Sherman, Peterson, Benjamin, Akos, Dennis, Narins, Mitch, Loh, Robert, and Enge, Per
Alternative Position Navigation & Timing (APNT) Based on Existing DME and UAT Ground Signals,
Presented September 2011 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Pullen, Sam, Walter, Todd, and Enge, Per
SBAS and GBAS Integrity for Non-Aviation Users: Moving Away from "Specific Risk"
Presented January 2011 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Pullen, Sam, Walter, Todd, and Enge, Per
Integrity for Non-Aviation Users
Published in GPS World, July 2011

Pullen, Sam, and Enge, Per
Using Outage History to Exclude High-Risk Satellites from GBAS Corrections
Presented September 2011 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Seo, Jiwon, Yu-Hsuan Chen, De Lorenzo, David, Lo, Sherman, Enge, Per, and Akos, Dennis
Real-Time Software Receiver Using Massively Parallel Processors for GPS Adaptive Antenna Array Processing (PRESENTATION)
Presented January 2011 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Seo, Jiwon, Walter, Todd, and Enge, Per
Correlation of GPS signal fades due to ionospheric scintillation for aviation applications
Published in Advances in Space Research, No. 47, pp. 1777-88, July 2011

Seo, Jiwon, Walter, Todd, and Enge, Per
Availability Impact on GPS Aviation due to Strong Ionospheric Scintillation
Published in IEEE Transactions on Aerospace and Electronic Systems, 2011

Seo, Jiwon, Yu-Hsuan Chen, De Lorenzo, David, Lo, Sherman, Walter, Todd, Enge, Per, Akos, Dennis, and Lee, Jiyun
A Real-Time Capable Software-Defined Receiver Using GPU for Adaptive Anti-Jam GPS Sensors
Published in Sensors, 2011

Thoelert, Steffen, Erker, Stefan, Furthner, Johann, and Meurer, Michael (DLR German Aerospace Center), Gao, Grace X., Heng, Liang, Walter, Todd, and Enge, Per (Stanford University)
First Signal in Space Analysis of GLONASS K-1
Presented September 2011 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Walter, Todd, Blanch, Juan, Phelts, R. Eric, and Enge, Per
Evolving WAAS to Serve L1/L5 Users
Presented September 2011 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Wong, Gabriel, Phelts, R. Eric, Walter, Todd, and Enge, Per
Alternative Characterization of Analog Signal Deformation for GNSS-GPS Satellites
Presented January 2011 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Wong, Gabriel, Phelts, R. Eric, Walter, Todd, and Enge, Per
Bounding Errors Caused by Nominal GNSS Signal Deformations
Presented September 2011 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR



2010 (Top)

Becker, G.T., Lo, S.C., De Lorenzo, D.S., Enge, P.K., and Paar, C.
Secure Location Verification -- A Security Analysis of GPS Signal Authentication
Published in Proceedings of DBSec 2010, the IFIP WG 11.3 Conference on Data and Applications Security, pp. 366-73.

Blanch, Juan, Walter, Todd, and Enge, Per,
RAIM with Optimal Integrity and Continuity Allocations Under Multiple Failures
Published in IEEE Transactions on Aerospace and Electronic Systems, Vol. 46, No. 3, July 2010, pp. 1235-47.

Blanch, Juan, Choi, Myungjun, Walter, Todd, Enge, Per, and Suzuki, Kazushi
Prototyping Advanced RAIM for Vertical Guidance
Presented September 2010 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Chen, Yu-Hsuan, Juang, Jyh-Ching, De Lorenzo, David, Seo, Jiwon, Lo, Sherman, Enge, Per, and Akos, Dennis
Real-Time Software Receiver for GPS Controlled Reception Pattern Antenna Array Processing
Presented September 2010 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Datta-Barua, Seebany, Lee, Jiyun, Pullen, Sam, Luo, Ming, Ene, Alexandru, Qiu, Di, Zhang, Godwin, and Enge, Per
Ionospheric Threat Parameterization for Local Area Global-Positioning-System-Based Aircraft Landing Systems
Published in Proceedings of the AIAA Journal of Aircraft, Vol 47, No. 4, pp. 1141-51, July-August 2010

De Lorenzo, David, Lo, Sherman, Seo, Jiwon, Chen, Yu-Hsuan, and Enge, Per
The WAAS/L5 Signal for Robust Time Transfer: Adaptive Beamsteering Antennas for Satellite Time Synchronization
Presented September 2010 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Eldredge, L., Enge, P., Harrison, M., Kenagy, R., Lo, S., Loh, R., Lilly, R., Narins, M., and Niles, R.
Alternative Positioning, Navigation, and Timing (PNT) Study
International Civil Aviation Organization (ICAO) navigation Systems Panel (NSP) Working Group Meetings, Montreal, Canada May 2010

Gao, Grace X., Heng, Liang, Wong, Phelts, Eric, Gabriel, Blanch, Juan, Walter, Todd, Enge, Per, Erker, Stefan, and Thoelert, Steffen
GPS in Mid-life with an International Team of Doctors: Analyzing IIF-1 Satellite Performance and Backward-Compatibility
Presented September 2010 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Heng, Liang, Gao, Grace X., Walter, Todd, and Enge, Per
GPS Ephemeris Error Screening and Results for 2006-2009
Presented January 2010 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Heng, Liang, Gao, Grace X., Walter, Todd, and Enge, Per
GPS Signal-in-Space Anomalies in the Last Decade: Data Mining of 400,000,000 GPS Navigation Messages
Presented September 2010 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Khanafseh, Samer, Yang, Fan, Pervan, Boris, Pullen, Sam, and Warburton, John
Carrier Phase Ionospheric Gradient Ground Monitor for GBAS with Experimental Validation
Presented September 2010 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Kim, Euiho, Walter, Todd, and Enge Per
Unaugmented GPS-Based Flight Inspection System
Published in IEEE Transactions on Aerospace and Electronics Systems, Vol. 46, No. 2, April 2010

Lee, Jiyun, Jung, Sungwook, Bang, Eugene, Pullen, Sam, and Enge, Per
Long Term Monitoring of Ionospheric Anomalies to Support the Local Area Augmentation System
Presented September 2010 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Lo, Sherman, Enge, Per, Niles, Frederick, Loh, Robert, Eldredge, Leo, and Narins, Mitchell
Preliminary Assessment of Alternative Navigation Means for Civil Aviation
Presented January 2010 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Lo, Sherman and Enge, Per
Authenticating Aviation Augmentation System Broadcasts
Presented May 2010 at the IEEE/ION Position Location and Navigation Symposium (PLANS), Palm Springs, CA

Murphy, Tim, Harris, Matt, Park, Young Shin, and Pullen, Sam
GBAS Differentially Corrected Positioning Service Ionospheric Anomaly Errors Evaluated in an Operational Context
Presented January 2010 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Narins, Mitch, Eldredge, Leo, Enge, Per, Harrison, Mike, Kenagy, Randy, and Lo, Sherman
Alternative Positioning Navigation and Timing -- The Need for Robust Radionavigation
Published in Proceedings of the Royal Institute of Navigation NAV10, Westminster, London, UK November-December 2010

Park, Young Shin, Pullen, Sam, and Enge, Per
Enabling LAAS Airport Surface Movement: Mitigating the Anomalous Ionospheric Threat
Presented May 2010 at the IEEE/ION Position Location and Navigation Symposium (PLANS), Palm Springs, CA

Park, Young Shin, Pullen, Sam, and Enge, Per
A Study of Severe Multipath Errors for the Proposed GBAS Airport Surface Movement Application
Presented September 2010 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Peterson, Benjamin, Lo, Sherman, and Enge, Per
Simple Loran Cycle Error Detection Algorithms for Maritime Harbor Entrance Approach Operations
Presented January 2010 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Phelts, R. E., Gao, Grace X., Wong, Gabriel, Heng, Liang, Walter, Todd, and Enge, Per (Stanford University), Erker, Stafen, and Thoelert, Steffen (DLR-German Aerospace Center)
Aviation Grade: Chips off the Block IIF (Evaluating the IIF-1 for Aviation Users)
Published by Inside GNSS July/August 2010

Powell, J. D., and Walter, Todd
Space Weather: Its Effect on GNSS, DGNSS, SBAS, and Flight Inspection
Presented June 2010 at the International Flight Inspection Symposium (IFIS), Beijing, China

Pullen, Sam, Luo, Ming, Walter, Todd, and Enge, Per
Using SBAS to Enhance GBAS User Availability: Results and Extensions to Enhance Air Traffic Management
Published in Proceedings of the ENRI International Workshop on ATM/CNS in Tokyo, Japan, September 2010

Seo, Jiwon
Overcoming Ionospheric Scintillation for Worldwide GPS Aviation
Ph.D. Dissertation, Stanford University, June 2010

Suzuki, Kazushi, Pullen, Sam, Enge, Per, and Ono, Takeshi
Evaluation of Dual-Frequency GBAS Performance using Data from Public Receiver Networks
Presented September 2010 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Tang, Haochen, Pullen, Sam, Enge, Per, Grattton, Livio, Brenner, Mats, Scheitlin, and Kline, Paul
Ephemeris Type A Fault Analysis and Mitigation for LAAS
Presented at the IEEE/ION Position Location and Navigation Symposium (PLANS) in Indian Wells, CA, May 2010

Thoelert, Steffen and Erker, Stafen (DLR-German Aerospace Center), Heng, Liang, Phelts, R. E., Gao, Grace X., Wong, Gabriel, Walter, Todd, and Enge, Per (Stanford University)
On the Air: New Signals from the First GPS IIF Satellite
Published by Inside GNSS July/August 2010

Walter, Todd, Blanch, Juan, and Enge, Per
Coverage Improvement for Dual Frequency SBAS
Presented January 2010 at the ION Institute of Navigation International Technical Meeting, San Diego, CA

Walter, Todd, Enge, Per and Blanch, Juan
Future Augmented
Published in GPS World March 2010

Walter, Todd, Blanch, Juan, and Enge, Per
Evaluation of Signal in Space Error Bounds to Support Aviation Integrity
Published in NAVIGATION, Vol. 57, No 2., Summer 2010, pp. 101-113

Walter, Todd, Blanch, Juan, and Enge, Per
Vertical Protection Level Equations for Dual Frequency SBAS
Presented September 2010 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR

Wong, Gabriel, Phelts, Eric, Walter, Todd, and Enge, Per
Characterization of Signal Deformations for GPS and WAAS Satellites
Presented September 2010 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Portland, OR



2009 (Top)

Becker, Georg, Lo, Sherman, De Lorenzo, David S., Qiu, Di, Par, Christoff, and Enge, Per
Efficient authentication mechanisms for navigation systems — a radio-navigation case study
Presented September 2009 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Blanch, Juan, Mayer, Christoph, Lo, Sherman Walter, Todd, Enge, Per
Hysteresis in RAIM
Presented September 2009 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

De Lorenzo, D. S., Lo, S. C., Enge, P. K., Feuerstein, M., Bhattacharya, T., Spain, S., and Kang, Z.
Design and Performance of a Minimum-Variance Hybrid Location Algorithm Utilizing GPS and Cellular Received Signal Strength for Positioning in Dense Urban Environments
Presented January 2009 at the Institute of Navigation (ION) International Technical Meeting, Anaheim, CA

De Lorenzo, D.S., Lo, S.C., Cohen, M., Chang, J., Inan, U.S., and Enge, P.
A Miniaturized Loran H-field Antenna for Handheld Devices
Presented October 2009 at the International Loran Association 38th Annual Meeting, Portland, ME

Gao, Grace X., Heng, Liang, De Lorenzo, David, Lo, Sherman, Akos, Dennis, Chen, Alan, Walter, Todd, Enge, Per, and Parkinson, Bradford
Modernization Milestone: Observing the First GPS Satellite with an L5 Payload
Published by Inside GNSS Magazine, Vol. 3, No. 4, pp. 60-64, May/June 2009

Gao, Grace X., Tang, Haochen, Blanch, Juan, Lee, Jiyun, Lo, Walter, Todd, and Enge, Per
Methodology and Case Studies of Signal-in-Space Error Calculation: Top-down Meets Bottom-up
PRESENTATION (in PDF)

Presented September 2009 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Gao, Grace X., Chen, Alan, De Lorenzo, David, Lo, Walter, Todd, and Enge, Per
Compass-M1 Broadcast Codes in E2, E5b, and E6 Frequency Bands
Published by IEEE Journal of Selected Topics in Signal Processing, Vol. 3., No. 4, pp. 599-612

Jan, S.S., Chan, W., and Walter, T.
MATLAB Algorithm Availability Simulation Tool
Published by GPS Solutions, Vol. 13., No. 4, September 2009

Lee, Jiyun, Pullen, Sam, and Enge, Per
Sigma Overbounding using a Position Domain Method for the Local Area Augmentation of GPS
Published in Proceedings of the IEEE Transactions on Aerospace and Electronic Systems, Vol 45, No 4, pp. 1262-74, October 2009.

Lo, Sherman, Peterson, Benjamin, and Enge, Per
Assessing the Security of a Navigation System: A Case Study using Enhanced Loran
PRESENTATION (in PDF)

Presented May 2009 at the European Navigation Conference GNSS, Naples, Italy

Lo, Sherman, De Lorenzo, David, Enge, Per, Akos, Dennis, and Bradley, P.
Signal Authentication: A Secure Civil GNSS for Today
Published by Inside GNSS, Sept/Oct 2009, pp. 30-39.

Lo, Sherman, Peterson, Benjamin and Enge, Per
Loran PF, SF, ASF for the Radio Technical Committee Maritime (RTCM)
Presented October 2009 at the International Loran Association 38th Annual Meeting, Portland, ME

Lo, Sherman, Wenzel, Robert and Enge, Per
Analysis and Modeling of Skywave Behavior
Presented October 2009 at the International Loran Association 38th Annual Meeting, Portland, ME

Park, Young Shin, Pullen, Sam, and Enge, Per
Enabling the LAAS Differentially Corrected Positioning Service (DCPS): Design and Requirements Alternatives
Presented September 2009 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Phelts, R. Eric
Sensitivity of Code Tracking Methods to PRN Differences
Presented May 2009 at the European Navigation Conference GNSS, Naples, Italy

Phelts, R. Eric, Walter, Todd, and Enge, Per
Characterizing Nominal Analog Signal Deformation on GNSS Signals
Presented September 2009 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Pullen, Sam
Providing Integrity for Satellite Navigation: Lessons Learned (Thus Far) from the Financial Collapse of 2008-2009
Presented September 2009 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Pullen, Sam, Park, Young Shin and Enge, Per
Impact and mitigation of ionospheric anomalies on ground-based augmentation of GNSS
Published in the AGU Electronic Journal, Radio Science, 44, RSOA21, 2009

Qiu, Di, De Lorenzo, David, Lo, Sherman, Boneh, Dan, and Enge, Per
Physical Pseudo Random Function in Radio Frequency Sources for Security
Presented January 2009 at the Institute of Navigation (ION) International Technical Meeting, Anaheim, CA

Qiu, Di, Boneh, Dan, Lo, Sherman, and Enge, Per
Robust Location Tag Generation from Noisy Location Data for Security Applications
Presented January 2009 at the Institute of Navigation (ION) International Technical Meeting, Anaheim, CA

Qiu, Di, Lo, Sherman, De Lorenzo, David S., and Enge, Per
Pattern Classification for Geotag Generation
Presented September 2009 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Seo, Jiwon, Walter, Todd, and Enge, Per
Availability Benefit of Future Dual Frequency GPS Avionics under Strong Ionospheric Scintillation
Presented September 2009 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Seo, Jiwon, Walter, Todd, Chiou, Tsung-Yu, and Enge, Per
Characteristics of deep GPS signal fading due to ionospheric scintillation for aviation receiver design
Published in the AGU Electronic Journal, Radio Science, 2009

Tang, Haochen, Blanch, Juan, Walter, Todd, and Enge, Per
Flight Test Data Validation of Dual-Frequency GPS Measurement Error Characteristics
PRESENTATION (in PDF)

Presented September 2009 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Walter, Todd, Blanch, Juan, and Enge, Per
Evaluation of Signal in Space Error Bounds to Support Aviation Integrity
Presented September 2009 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA



2008 (Top)

Blanch, Juan, Walter, Todd and Enge, Per
Position error bound calculation for GNSS using measurement residuals
Published in IEEE Transactions on Aerospace and Electronic Systems, Vol. 44, No. 3, July 2008

Blanch, Juan, Walter, Todd and Enge, Per
A Simple Algorithm for Dual Frequency Ground Monitoring Compatible with ARAIM
Presented September 2008 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Chiou, Tsung-Yu, Seo, Jiwon, Walter, Todd and Enge, Per
Performance of a Doppler-Aided GPS Navigation System for Aviation Applications under Ionospheric Scintillation
Presented September 2008 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Datta-Barua, S., Mannucci, A.J., Walter, T., and Enge, P.
Altitudinal variation of midlatitude localized TEC enhancement from ground- and space-based measurements
Published in Space Weather, Vol. 6, S10D06, October 2008

Datta-Barua, S., Walter, T., Blanch, J., and Enge, P.
Bounding higher-order ionosphere errors for the dual-frequency GPS user
Published in Radio Science, Vol. 43, RS5010, October 2008

Ene, Alexandru, Blanch, Juan, Walter, Todd and Powell, J. D.
Validation of Multiple Hypothesis RAIM Algorithm using Dual-frequency GNSS Signals
Presented April 2008 at the European Navigation Conference GNSS/ Toulouse Space Show, Toulouse, France

Gao, Grace Xingxin, Chen, Alan, Lo, Sherman, DeLorenzo, David, Walter, Todd, and Enge, Per
Compass M-1 Broadcast Codes and Their Application to Acquisition and Tracking
Presented January 2008 at the ION Institute of Navigation National Technical Meeting, San Diego, CA

Gao, G. X., Akos, D., Walter, T., and Enge, P.
GIOVE-B on the Air: Understanding Galileo's New Signals
Published by Inside GNSS May/June2008

Hsu, Po-Hsin, Chiu, Timothy, Golubev, Yuri, and Phelts, R. E.
Test Results for the WAAS Signal Quality Monitor
Presented May 2008 at the IEEE/ION Position Location and Navigation Symposium, Monterey, CA

Jan, S. S., Gebre-Egziabher, D., Walter, T., and Enge, P.
Improving GPS-Based Landing System Performance using an Empirical Barometric Altimeter Confidence Bound
Published by IEEE Transactions on Aerospace and Electronic Systems, Vol. 44, No. 1, January 2008

Johnson, Gregory W., Swaszek, Peter F., Hartnett, Richard J., Dykstra, Ken, Shalaev, Ruslan and Lo, Sherman
Temporal Variation of Loran ASFs and their Effects on HEA Navigation
Presented April 2008 at the European Navigation Conference GNSS/ Toulouse Space Show, Toulouse, France

Kim, Euiho, Walter, Todd, and Powell, J. David
GNSS-based Flight Inspection Systems
Presented June 2008 at the International Flight Inspection Symposium, Oklahoma City, OK

Konovaltsev, A., De Lorenzo, David S., Hornbostel, A., and Enge, Per
Mitigation of Continuous and Pulsed Radio Interference with GNSS Antenna Arrays
Presented September 2008 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Lo, Sherman, Wenzel, Robert, Johnson, Greg, and Enge, Per
Assessment of the Methodology for Bounding Loran Temporal ASF for Aviation
Presented January 2008 at the ION Institute of Navigation National Technical Meeting, San Diego, CA

Lo, Sherman, Peterson, Benjamin, and Enge, Per
Using Loran for Broadcast of Integrity Information for Modernized Global Navigation Satellite Systems (GNSS)
Presented April 2008 at the European Navigation Conference GNSS/ Toulouse Space Show, Toulouse, France

Lo, Sherman, Peterson, Benjamin, Boyce, C. O. Lee and Enge, Per
Loran Coverage Availability Simulation Tool
Presented September 2008 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Lo, Sherman, Peterson, Benjamin, Boyce, C. O. Lee and Enge, Per
Loran Coverage Availability Simulation Tool*
Presented October 2008 at the Royal Institute of Navigation (RIN) NAV08/International Loran Association 37th Annual Meeting, Westminster, London, UK (*Slightly expanded version of ION paper with same title)

Park, Young Shin, Pullen, Sam, and Enge, Per
Mitigation of Anomalous Ionosphere Threat to Enhance Utility of LAAS Differentially Corrected Positioning Service (DCPS)
Presented May 2008 at the IEEE/ION Position Location and Navigation Symposium, Monterey, CA

Peterson, Benjamin, Lo, Sherman and Enge, Per
Integrating Loran and GNSS for Safety of Life Applications
Presented September 2008 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Pullen, Sam, Park, Young Shin, and Enge, Per
The Impact and Mitigation of Ionosphere Anomalies on Ground-Based Augmentation of GNSS
Presented May 2008 at the 12th International Ionospheric Effects Symposium, Alexandria, VA

Pullen, Sam
Satellite Navigation Integrity Assurance: Lessons Learned from Hurricane Katrina
Presented September 2008 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Qiu, Di, Lo, Sherman and Enge, Per.
A Measure of Loran Location-based Parameters
Presented May 2008 at the IEEE/ION Position Location and Navigation Symposium, Monterey, CA

Ramakrishnan, Shankar, Lee, Jiyun, Pullen, Sam, and Enge, Per
Targeted Ephemeris Decorrelation Parameter Inflation for Improved LAAS Availability during Severe Ionosphere Anomalies
Presented January 2008 at the ION Institute of Navigation National Technical Meeting, San Diego, CA

Ramakrishnan, Shankar, Gao, Grace Xingxin, De Lorenzo, David, Walter, Todd, Enge, Per and Akos, Dennis
Design and Analysis of Reconfigurable Embedded GNSS Receivers Using Model-Based Design Tools
Presented September 2008 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Rife, J., and Phelts, R. E.
Formulation of a Time-Varying Maximum Allowable Error for Ground-Based Augmentation Systems
Published by IEEE Transactions on Aerospace and Electronic Systems, Vol. 44, No. 2, April 2008

Rife, J., Pullen, S., De Lorenzo, D. S., Kim, U-S., Koenig, M., Chiou, T-Y., Khanafseh, S., Kempny, B., and Pervan, B.
Navigation, Interference Suppression, and Fault Monitoring in the Sea-Based Joint Precision Approach and Landing System
Published in IEEE Proceedings, Vol. 96, No. 12., pp. 1958-75

Schroth, Georg, Ene, Alexandru, Blanch, Juan, Walter, Todd and Enge, Per
Failure Detection and Exclusion via Range Consensus
Presented April 2008 at the European Navigation Conference GNSS/ Toulouse Space Show, Toulouse, France

Schroth, Georg, Rippl, Markus, Ene, Alexandru, Blanch, Juan, Belabbas, Boubeker, Walter, Todd, Enge, Per, and Meurer, Michael
Enhancements of the Range Consensus Algorithm (RANCO)
Presented September 2008 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Seo, Jiwon, Walter, Todd, Chiou, Tsung-Yu, and Enge, Per
Characteristics of Deep GPS Signal Fading Due to Ionospheric Scintillation for Aviation Receiver Design
Presented May 2008 at the 12th International Ionospheric Effects Symposium, Alexandria, VA

Seo, Jiwon, Walter, Todd, Chiou, Tsung-Yu, Blanch, Juan, and Enge, Per
Evaluation of Deep Signal Fading Effects Due to Ionospheric Scintillation on GPS Aviation Receivers
Presented September 2008 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Savannah, GA

Walter, T., Blanch, J., Enge, P., Pervan, B., and Gratton, L.
Future Architectures to Provide Aviation Integrity
Presented January 2008 at the ION Institute of Navigation National Technical Meeting, San Diego, CA

Walter, T., Enge, P., Blanch, J., and Pervan, B.
Worldwide Vertical Guidance of Aircraft Based on Modernized GPS and New Integrity Augmentations
Published in Proceedings of the IEEE, Vol. 96, N0. 12, December 2008



2007 (Top)

Blanch, Juan, Todd Walter, and Per Enge
Understanding PHMI for Safety of life applications in GNSS
Presented January 2007 at the Institute of Navigation National Technical Meeting, San Diego, CA

Blanch, Juan, Ene, Alex, Walter, Todd, and Enge, Per
An Optimized Multiple Hypothesis RAIM Algorithm for Vertical Guidance
Presented September 2007 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

Chiou, Tsung-Yu, Walter, Todd, Gebre-Egziahber, Demoz,  Akos, Dennis, and Enge, Per
Model Analysis on the Performance of an Inertial Aided FLL-Assisted-PLL Carrier-Tracking Loop in the Presence of Ionospheric Scintillations
Presented January 2007 at the ION Institute of Navigation National Technical Meeting, San Diego, CA

Chiou, Tsung-yu
On the Probability Density Function and Stability Properties for a Cross-Product Frequency-Locked Loop
Presented September 2007 at the Institute of Navigation GNSS Conference, Fort Worth, TX

Datta-Barua, Seebany, Walter, Todd, Pullen, Sam, and Enge, Per
Modeling the 20 November 2003 Ionosphere Storm with GRACE
Presented September 2007 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

De Lorenzo, D. S., Antreich, F., Denks, H., Hornbostel, A., Weber, C., and Enge, P.
Testing of Adaptive Beamsteering for Interference Rejection in GNSS Receivers
Presented May 2007 at the European Navigation Conference GNSS/TimeNav 2007, Geneva, Switzerland

Do, Ju-Yong, Rabinowitz, Matthew and Enge, Per
Multi-Fault Tolerant RAIM Algorithm for Hybrid GPS/TV Positioning
Presented January 2007 at the ION Institute of Navigation National Technical Meeting, San Diego, CA

Do, Ju-Yong, Rabinowitz, Matthew and Enge, Per
Robustness of TOA and TDOA Positioning Under Suboptimal Weighting Conditions
Published by IEEE Transactions on Aerospace Electronic Systems 2007

Ene, Alexandru, Blanch, Juan, and Powell, J. David
Fault Detection and Elimination for Galileo-GPS Vertical Guidance
Presented January 2007 at the ION Institute of Navigation National Technical Meeting, San Diego, CA

Ene, Alexandru
Multiple Hypothesis RAIM with Real-Time FDE and Forecasted Availability for Combined Galileo-GPS Vertical Guidance
Presented May 2007 at the European Navigation Conference GNSS/TimeNav 2007, Geneva, Switzerland

Gao, Grace, De Lorenzo, David, Lo, Sherman, Akos, Dennis, Chen, Alan, Walter, Todd, and Enge, Per
Galileo GIOVE-A Broadcast E5 Codes and their Application to Acquisition and Tracking
Presented January 2007 at the ION Institute of Navigation National Technical Meeting, San Diego, CA

Gao, Grace Xingxin, Datta-Barua, Seebany, Walter, Todd, and Enge, Per
Ionosphere Effects for Wideband GNSS Signals
Presented April 2007 at the ION Institute of Navigation Annual Meeting, Cambridge, MA

Gao, Grace Xingxin, David S. De Lorenzo, Todd Walter and Per Enge
Acquisition and Tracking of GIOVE-A Broadcast L1/E5/E6 Signals and Analysis of DME/TACAN Interference on Receiver Design
Presented May 2007 at the European Navigation Conference GNSS/TimeNav 2007, Geneva, Switzerland

Gao, G. X., Chen, A. Lo, S., De Lorenzo, D. S., and Enge, P.
GNSS over China: The Compass MEO Satellite Codes
Published by Inside GNSS July/August 2007, pp. 36-43

Gao, Grace Xingxin
DME/TACAN Interference and its Mitigation in L5/E5 Bands
Presented September 2007 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

Kim, Euiho, Walter, T., and Powell, J. D.
Adaptive Carrier Smoothing using Code and Carrier Divergence
Presented January 2007 at the ION Institute of Navigation National Technical Meeting, San Diego, CA

Kim, Euiho, Walter, Todd and J.D. Powell
WAAS-Based Flight Inspection System
Presented April 2007 at the ION Institute of Navigation Annual Meeting, Cambridge, MA

Kim, Euiho, Walter, Todd and J.D. Powell
Standalone GPS-Based Flight Inspection System
Presented May 2007 at the European Navigation Conference GNSS/TimeNav 2007, Geneva, Switzerland

Konno, Hiroyuki
Dual-Frequency Smoothing for CAT III LAAS: Performance Assessment Considering Ionosphere Anomalies
Presented September 2007 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

Lo, Sherman, Peterson, Benjamin, and Enge, Per
Proving the Integrity of the Weighted Sum Squared Error (WSSE) Loran Cycle Confidence Algorithm
Presented January 2007 at the ION Institute of Navigation National Technical Meeting, San Diego, CA

Lo, Sherman, Peterson, B., Swaszek, P., and Enge, P.
Loran Data Modulation: Extensions and Examples
Published by IEEE Transactions on Aerospace Electronic Systems, April 2007

Lo, Sherman, Peterson, B., and Enge, P.
Loran Data Modulation: A Primer
Published by IEEE Aerospace and Electronic Systems Magazine, Tutorial IV, September 2007

Lo, Sherman, Johnson, G., Swaszek, P., Wenzel, R. Morris, P., and Enge, P.
Using Seasonal Monitor Data to Assess Aviation Integrity
Presented October 2007 at the International Loran Association 36th Annual Meeting, Orlando, FL

Lo, Sherman, Peterson, B., and Enge, P.
Proving the Integrity of the Weighted Sum Squared Error (WSSE) Loran Cycle Confidence Algorithm
Published by Navigation: The Journal of the Institute of Navigation, Vol 54, Number 4, 2007

Park, Young Shin, Zhang, G., Pullen, S., Lee, J. and Enge, P.
Data-Replay Analysis of LAAS Safety during Ionosphere Storms
Presented September 2007 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

Phelts, R. Eric
Range Biases on Modernized GNSS Codes
Presented May 2007 at the European Navigation Conference GNSS/TimeNav 2007, Geneva, Switzerland

Pullen, Sam
Worldwide Trends in GNSS Development and their Implications for Civil User Performance and Safety
Presented November 2007 at the Japan GNSS/GPS Symposium, Tokyo, Japan

Qiu, Di, Lo, Sherman, Peterson, Benjamin, and Enge, Per
Geoencryption Using Loran
Presented January 2007 at the ION Institute of Navigation National Technical Meeting, San Diego, CA

Qiu, Di
Security Analysis of Geoencryption: A Case Study Using Loran
Presented September 2007 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

Qiu, Di, Lo, S., and Enge, P.
Geoencryption with Loran
Presented October 2007 at the International Loran Association 36th Annual Meeting, Orlando, FL

Qiu, Di. Lo, Sherman, and Enge, Per
Security for Insecure Times: Geoencryption with Loran
Published by GPS World November 2007

Quigley, M., Abbeel, P., De Lorenzo, D. S., Gu, Y., Bolouki, S., Akos, D. M., and Ng, A. Y.
Portable GPS Baseband Logging
Presented September 2007 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

Seo, Jiwon, Walter, Todd, Marks, Edward, Chiou, Tsung-Yu, and Enge, Per
Ionospheric Scintillation Effects on GPS Receivers during Solar Minimum and Maximum
Presented June 2007 at the International Beacon Satellite Symposium, Boston, MA

Swaszek, P., Johnson, G., Hartnett, R., and Lo, S.
An Investigation into the Temporal Correlation at the ASF Monitor Sites
Presented October 2007 at the International Loran Association 36th Annual Meeting, Orlando, FL

Walter, Todd, Blanch, Juan, and Enge, Per
L5 Satellite Based Augmentation Systems Protection Level Equations
Presented December 2007 at the International Global Navigation Satellite Systems (IGNSS) Symposium, Sydney, Australia

Zhang, Godwin, Lee, Jiyun, Datta-Barua, Seebany, Pullen, S. and Enge, Per
Low-Elevation Ionosphere Spatial Anomalies Discovered from the 20 November 2003 Storm
Presented January 2007 at the ION Institute of Navigation National Technical Meeting, San Diego, CA



2006 (Top)

Boyce, C.O.L., Lo, S., Powell, J. D., and Enge, P.
Mitigating Atmospheric Noise for Loran
Presented September 2006 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

Boyce, C.O.L., Lo, S., Powell, J. D., and Enge, P.
Analysis of Noise and Cycle Selection in a Loran Receiver
Presented October 2006 at the International Loran Association 35th Annual Meeting, Groton, CT

Datta-Barua, Seebany, Walter, Todd, Blanch, Juan, and Enge, Per
Bounding Higher Order Ionosphere Errors for the Dual Frequency GPS User
Presented September 2006 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

De Lorenzo, D,  Rife, J., Enge, P., and Akos, D.
Navigation Accuracy and Interference Rejection for an Adaptive GPS Antenna Array ]  [ PRESENTATION (in PDF)
Presented September 2006 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

Do, Ju-Yong, Rabinowitz, M., and Enge, P.
Performance of TOA and TDOA in a Non-homogeneous Transmitter Network Combining GPS and Terrestrial Signals
Presented January 2006 at the Institute of Navigation's National Technical Meeting, Monterey, CA

Do, Ju-Yong, Rabinowitz, M., and Enge, P.
Performance of Hybrid Positioning System Combining GPS and Television Signals
Presented April 2006 at the IEEE/ION Position Location and Navigation Symposium, San Diego, CA

Ene, Alexandru, Blanch, J., and Walter, T.
Galileo-GPS RAIM for Vertical Guidance
Presented January 2006 at the Institute of Navigation's National Technical Meeting, Monterey, CA

Ene, Alexandru
Further Development of Galileo-GPS RAIM for Vertical Guidance
Presented September 2006 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

Gao, Grace, Spilker, James, Walter, Todd, Enge, Per and Pratt, Anthony
Code Generation Scheme and Property Analysis of Broadcast Galileo L1 and E6 Signals
Presented September 2006 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

Kim, Euiho, Walter, Todd and Powell, J. D.
A Reference Point-based Precise Relative Positioning Method Using a Single Frequency Receiver
Presented January 2006 at the Institute of Navigation's National Technical Meeting, Monterey, CA

Kim, Euiho, Peled, Uri, Walter, Todd and Powell, J. D.
A Development of WAAS-Aided Flight Inspection Truth System
Presented April 2006 at the IEEE/ION Position Location and Navigation Symposium, San Diego, CA

Kim, Euiho, Walter, T., and Powell, J. D.
WAAS-Aided Flight Inspection Truth System
Presented June 2006 at the 14th International Flight Inspection Symposium (IFIS), Toulouse, France

Kim, Euiho, Walter, T., and Powell, J. D.
Optimizing WAAS Accuracy/Stability For a Single Frequency Receiver
Presented September 2006 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

Konno, Hiroyuki, Pullen, Sam, Rife, Jason and Enge, Per
Evaluation of Two Types of Dual-Frequency Differential GPS Techniques under Anomalous Ionosphere Conditions
Presented January 2006 at the Institute of Navigation's National Technical Meeting, Monterey, CA

Konno, H, Pullen, S., Rife, J. and Enge, P.
Ionosphere Monitoring Methodology for Hybrid Dual-Frequency LAAS
Presented September 2006 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

Lee, Jiyun, Pullen, S., Datta-Barua, S., and Enge, P.
Assessment of Nominal Ionosphere Spatial Decorrelation for LAAS
Presented April 2006 at the IEEE/ION Position Location and Navigation Symposium, San Diego, CA

Lee, Jiyun, Luo, M. Pullen, S., Park, Y. S., Enge, P., and Brenner, M.
Position-Domain Geometry Screening to Maximize LAAS Availability in the Presence of Ionosphere Anomalies
Presented September 2006 at the ION Institute of Navigation Global Navigation Satellite Systems Conference, Fort Worth, TX

Lo, Sherman., Peterson, B., and Enge, P.
Assessing the Loran Cycle Confidence Algorithm
Presented October 2006 at the International Loran Association 35th Annual Meeting, Groton, CT

Lo, Sherman, and Enge, P.
Preliminary Assessment of Loran for Required Navigation Performance 1.0
Presented October 2006 at the International Loran Association 35th Annual Meeting, Groton, CT

Phelts, R. Eric, and Akos, D.
Effects of Signal Deformations on Modernized GNSS Signals
Journal of Global Positioning Systems Vol.5 No.1-2, 2006

Pullen, Sam, Rife, J., and Enge, P.
Prior Probability Model Development to Support System Safety Verification in the Presence of Anomalies
Presented April 2006 at the IEEE/ION Position Location and Navigation Symposium, San Diego, CA

Rife, Jason, Phelts, R.E.
Formulation of a Time-Varying Maximum Allowable Error for Ground-Based Augmentation Systems
Presented January 2006 at the Institute of Navigation's National Technical Meeting, Monterey, CA

Rife, Jason, Pullen, S., Walter, T., Phelts, E., Pervan, B., and Enge, P.
WAAS-Based Threat Monitoring for a Local Airport Monitor (LAM) that Supports Category I Precision Approach
Presented April 2006 at the IEEE/ION Position Location and Navigation Symposium, San Diego, CA

Seo, Jiwon, Rife, J., Pullen, S., Walter, T., and Enge, P.
Field Data Analysis for a Range-Based Local Airport Monitor for WAAS
Presented January 2006 at the Institute of Navigation's National Technical Meeting, Monterey, CA

Walter, T., and Powell, J. D.
Flight Inspection of GNSS SBAS Procedures
Presented June 2006 at the 14th International Flight Inspection Symposium (IFIS), Toulouse, France



2005 (Top)

Blanch, Juan, Walter, Todd, and Enge, Per
Error Bound Optimization using Second Order Cone Programming
Presented January 2005 at the Institute of Navigation's National Technical Meeting, San Diego CA

Blanch, Juan, Todd Walter, and Per Enge
Protection Level Calculation in the Presence of Heavy Tail Errors Using Measurement Residuals
Presented July 2005 at the European Navigation Conference GNSS 2005, Munich, Germany

Blanch, Juan, Walter, Todd, and Enge, Per
Protection Level Calculation Using Measurement Residuals: Theory and Results
Presented September 2005 at the Institute of Navigation GNSS Conference, Long Beach, CA

Boyce, L., S. Lo, J. D. Powell, and P. Enge
Noise Assessment and Mitigation for Loran for Aviation
Presented June 2005 at the Institute of Navigation's Annual Meeting, Cambridge, MA

Boyce, L., S. Lo, J. D. Powell, and P. Enge
Noise Assessment and Mitigation for Loran for Aviation
Presented October 2005 at the International Loran Association 34th Annual Meeting, 2005, Santa Barbara, CA

Chiou, Tsung-Yu
GPS Receiver Performance Using Inertial-Aided Carrier Tracking Loop
Presented September 2005 at the Institute of Navigation's GNSS Conference, Long Beach, CA

Datta-Barua, S., T. Walter, H. Konno, J. Blanch, and P. Enge
Verification of Low Latitude Ionosphere Effects on WAAS during October 2003 Geomagnetic Storm
Presented June 2005 at the Institute of Navigation's Annual Meeting, Cambridge, MA

Datta-Barua, S., T. Walter, J. Blanch, and P. Enge
Can WAAS Availability Be Inferred From Geomagnetic Data? An Analysis
Proceedings of the Ionospheric Effects Symposium 2005, Alexandria, Virginia: 3-5 May 2005.

De Lorenzo, D, J. Gautier, J. Rife, P. Enge, and D. Akos
Adaptive Array Processing for GPS Interference Rejection
Presented September 2005 at the Institute of Navigation's GNSS Conference, Long Beach, CA

Do, J., M. Rabinowitz, P. Enge
Linear Time-of-Arrival Estimation in a Multipath Environment by Inverse Correlation Method
Presented June 2005 at the Institute of Navigation's Annual Meeting, Cambridge, MA

Ene, Alexandru, Qiu, Diu, Luo, Ming, Pullen, Sam, and Enge, Per
A Comprehensive Ionosphere Storm Data Analysis Method to Support LAAS Threat Model Development
Presented January 2005 at the Institute of Navigation's National Technical Meeting, San Diego CA

Kim, Ung Suok
Analysis of Carrier Phase and Group Delay Biases Introduced by CRPA Hardware (Student Paper Award)
Presented September 2005 at the Institute of Navigation's GNSS Conference, Long Beach, CA

Koenig, Michael, J. Rife, S. Pullen, and P. Enge
Optimizing Channel Selection for the JPALS' Land-based Integrity Monitor
Presented September 2005 at the Institute of Navigation's GNSS Conference, Long Beach, CA

Konno, Hiroyuki, Pullen, Sam,  Luo, Ming, and Enge, Per
Analysis of Ionosphere Gradient Using Japan GEONET Data
Presented January 2005 at the Institute of Navigation's National Technical Meeting, San Diego CA

Lo, Sherman, Morris, P.,  and  and Enge, P.
Early Skywave Detection Network: Preliminary Design and Analysis
Presented October 2005 at the International Loran Association 34th Annual Meeting, 2005, Santa Barbara, CA

Luo, Ming, S. Pullen, S. Datta-Barua, G. Zhang, T. Walter, and P. Enge
LAAS Study of Slow-Moving Ionosphere Anomalies and Their Potential Impacts
PRESENTATION (in PowerPoint)

Presented September 2005 at the Institute of Navigation's GNSS Meeting, Long Beach, CA

Powell, J. David, C. Jennings, and W. Holforty
Use of ADS-B and Perspective Displays to Enhance Airport Capacity
Presented November 2005 at the 24th Digital Avionics Systems Conference, Washington D.C.

Rife, J., S. Pullen
The Impact of Measurement Biases on Availability for CAT III LAAS
Presented June 2005 at the Institute of Navigation's Annual Meeting, Cambridge, MA

Rife, J., S. Pullen, T. Walter, and P. Enge
Vertical Protectiion Levels for a Local Airport Monitor for WAAS
Presented June 2005 at the Institute of Navigation's Annual Meeting, Cambridge, MA

Walter, Todd, S. Pullen, J. Rife, J. Seo, and P. Enge
The Advantages of Local Monitoring and VHF Data Broadcast for SBAS
Presented July 2005 at the European Navigation Conference GNSS 2005, Munich, Germany



2004 (Top)

Blanch, Juan, et. al.
A New Ionospheric Estimation Algorithm for SBAS Combining Kriging and Tomography
Presented January 2004 at the Institute of Navigation's National Technical Meeting, San Diego, CA

Blanch, Juan, Walter, Todd, and Enge, Per
Ionospheric Estimation using Extended Kriging for a low latitude SBAS
Presented September 2004 at the Institute of Navigation GNSS Conference, Long Beach, CA

Carroll, Kevin M., Hawes, A., Peterson, B., Dykstra, K., Swaszek, P. and Lo, S.
Differential Loran-C
Presented May 2004 at the European Navigation Conference - GNSS 2004, Rotterdam, The Netherlands<

Chiou, Tsung-Yu, Alban, Santiago, Atwater, Sarah, Gautier, Jennifer, Pullen, Sam, Enge, Per, Akos, Dennis, Gebre-Egziabher, Demoz, and Pervan, Boris S.
Performance Analysis and Experimental Validation of a Doppler-Aided GPS/INS Receiver for JPALS Applications
Presented September 2004 at the Institute of Navigation's GNSS Meeting, Long Beach, CA

Datta-Barua, S.
Ionospheric Threats to Space-Based Augmentation System Development
Presented September 2004 at the Institute of Navigation's GNSS Meeting, Long Beach CA

De Lorenzo, David S. Alban, Santiago; Gautier, Jennifer; Enge, Per; and Akos, Dennis
GPS Attitude Determination for a JPALS Testbed: Integer Initialization and Testing
Presented April 2004 at the IEEE Position Location and Navigation Symposium, Monterey, CA

De Lorenzo, David S.; Gautier, Jennifer; Enge, Per; and Akos, Dennis
GPS Receiver Architecture Effects on Controlled Reception Pattern Antennas for JPALS
Presented September 2004 at the Institute of Navigation's GNSS Conference, Long Beach, CA

Do, Juyong, Dennis Akos, and Per Enge
L and S Bands Spectrum Survey in the San Francisco Bay Area
Presented April 2004 at the IEEE Position Location and Navigation Symposium, Monterey, CA

Kim, Ung Suok, David S. De Lorenzo, Jennifer Gautier, Per Enge, Dennis Akos, and John Orr
Precise Phase Calibration of a Controlled Reception Pattern GPS Antenna for JPALS
Presented April 2004 at the IEEE Position Location and Navigation Symposium, Monterey, CA

Kim, U. S., De Lorenzo, D. S., Gautier, J., Enge, P., and Orr, J. A.
Phase Effects Analysis of Patch Antenna CRPAs for JPALS
Presented September 2004 at the Institute of Navigation GNSS Conference in Long Beach, CA

Lee, Jiyun
LAAS Position Domain Monitor Analysis and Test Results for CAT II/III Operations
Presented September 2004 at the Institute of Navigation GNSS Conference, Long Beach, CA

Lo, Sherman, et. al.
Loran Availability and Continuity Analysis for Required Navigation Performance 0.3
Presented May 2004 at the European Navigation Conference - GNSS 2004, Rotterdam, The Netherlands

Lo, Sherman, et. al.
Loran Integrity Analysis for Required Navigation Performance 0.3
Presented June 2004 at the 5th International Symposium on Integration of LORAN-C/Eurofix and EGNOS/Galileo, Munich, Germany

Lo, Sherman, et. al.
Overview of the Safety Analysis of Loran for Aviation
Presented June 2004 at the Institute of Navigation Annual Meeting, Dayton, OH

Luo, Ming, Pullen, S., Walter, T., and Enge, P.
Ionosphere Spatial Gradient Threat for LAAS: Mitigation and Tolerable Threat Space
Presented January 2004 at the Institute of Navigation's National Technical Meeting, San Diego, CA

Luo, Ming, Pullen, Sam, Ene, Alexander, Qiu, Diu, Walter, Todd, and Enge, Per
Ionosphere Threat to LAAS: Updated Model, User Impact, and Mitigations
Presented September 2004 at the Institute of Navigation GNSS Conference, Long Beach, CA

Mitelman, Alexander M., R. Eric Phelts, Dennis M. Akos, Samuel P. Pullen, and Per K. Enge
Signal Deformations On Nominally Healthy GPS Satellites
Presented January 2004 at the Institute of Navigation's National Technical Meeting, San Diego, CA

Phelts, R. Eric, Walter, Todd, and Enge, Per
Range Biases on the WAAS Geostationary Satellites
Presented January 2004 at the Institute of Navigation's National Technical Meeting, San Diego, CA

Phelts, R. E., and Akos, D. M.
Nominal Signal Deformations: Limits on GPS Range Accuracy
Presented December 2004 at the International Symposium on GNSS/GPS in Sydney, Australia

Pullen, Sam and Enge, Per
A Civil User Perspective on Near-Term and Long-Term GPS Modernization
Proceedings of Japan GPS/GNSS Symposium 2004,  Tokyo, Japan, November 17-19, 2004

Rajagopal, Sriram, et. al.
Correlation Structure of the Equatorial Ionosphere
Presented January 2004 at the Institute of Navigation's National Technical Meeting, San Diego, CA

Rife, Jason, Sam Pullen, Boris Pervan and Per Enge
Paired Overbounding and Application to GPS Augmentation
Presented April 2004 at the IEEE Position Location and Navigation Symposium, Monterey, CA

Rife, Jason, Sam Pullen, and Boris Pervan
Core Overbounding and its Implications for LAAS Integrity
Presented September 2004 at the Institute of Navigation GNSS Conference in Long Beach, CA

Rife, Jason, Todd Walter, and Juan Blanch
Overbounding SBAS and GBAS Error Distributions with Excess-Mass Functions
Presented December 2004 at the International Symposium on GNSS/GPS in Sydney, Australia

Walter, Todd, Datta-Barua, Seebany, Blanch, Juan, and Enge, Per
The Effects of Large Ionospheric Gradients on Single Frequency Airborne Smoothing Filters for WAAS and LAAS
Presented January 2004 at the Institute of Navigation's National Technical Meeting, San Diego, CA

Walter, Todd, Enge, Per, and Reddan, Pat
Modernizing WAAS
Presented September 2004 at the Institute of Navigation's GNSS Meeting, Long Beach CA

Walter, Todd, Rajagopal, Sriram, Datta-Barua, Seebany, and Blanch, Juan
Protecting Against Unsampled Ionospheric Threats
Presented October 2004 at the Beacon Satellite Symposium, Trieste, Italy

Walter, Todd, Blanch, Juan, and Rife, Jason
Treatment of Biased Error Distributions in SBAS
Presented December 2004 at the International Symposium on GNSS/GPS in Sydney, Australia

Xie, Gang
Optimal On-Airport Monitoring of the Integrity of GPS-Based Landing Systems
Ph.D. Dissertation, Stanford University, March 2004



2003 (Top)

Akos, Dennis, et. al.
A Prototyping Platform for Multi-Frequency GNSS Receivers
Presented September 2003 at the Institute of Navigation's GPS/GNSS Meeting, Portland, OR

Alban, Santiago, Akos, D., Rock, S. and Gebre-Egziabher, D.
Performance Analysis and Architectures for INS-Aided GPS Tracking Loops
Presented January 2003 at the Institute of Navigation's National Technical Meeting, Anaheim, CA

Blanch, Juan, Walter, T., and Enge, P.
Adapting Kriging to the WAAS MOPS Ionospheric Grid
Presented January 2003 at the Institute of Navigation's National Technical Meeting, Anaheim, CA

Blanch, Juan, Walter, T., and Enge, P.
Measurement Noise versus Process Noise in Ionosphere Estimation for WAAS
Presented January 2003 at the Institute of Navigation's National Technical Meeting, Anaheim, CA

Blanch, Juan
Using Kriging to bound Satellite Ranging Errors due to the Ionosphere
Ph.D. Dissertation, Stanford University, December 2003

Boyce, Lee, et. al.
A Time Domain Atmospheric Noise Level Analysis
Presented November 2003 at the International Loran Association 32nd Annual Meeting, 2003, Boulder, CO

Datta-Barua, S., P. Doherty, S. Delay, T. Dehel, and J. Klobuchar
Ionospheric Scintillation Effects on Single and Dual Frequency GPS Positioning
Presented September 2003 at the Institute of Navigation's GPS/GNSS Meeting, Portland, OR

Enge, Per
GPS Modernization: Capabilities of the New Civil Signals
Presented 29 July – 1 August 2003 at the Australian International Aerospace Congress, Brisbane, Australia

Gautier, Jennifer
GPS/INS Generalized Evaluation Tool (GIGET) for the Design and Testing of Integrated Navigation Systems
Ph.D. Dissertation, Stanford University, June 2003

Jan, Shau-Shiun, Walter, T., and Enge, P.
Techniques for Graceful Reversion from Dual to Single Frequency WAAS
Presented January 2003 at the Institute of Navigation's National Technical Meeting, Anaheim, CA

Jan, Shau-Shiun
Aircraft Landing Using a Modernized Global Positioning System and the Wide Area Augmentation System
Ph.D. Dissertation, Stanford University, May 2003

Lo, Sherman, et. al.
Loran Fault Trees for Required Navigation Performance 0.3
Presented January 2003 at the Institute of Navigation's National Technical Meeting, Anaheim, CA

Lo, Sherman, et. al.
Loran for Required Navigation Performance 0.3: The Current Work of the Loran Integrity Performance Panel (LORIPP)
Presented April 2003 at the European Navigation Conference - Global Navigation Satellite Systems (ENC GNSS), Graz, Austria

Lo, Sherman, et. al.
Loran for RNP 0.3 Approach: The Preliminary Conclusions of Loran Integrity Performance Panel (LORIPP)
Presented September 2003 at the Institute of Navigation's GPS/GNSS Meeting, Portland, OR

Lo, Sherman, et. al.
Analysis of the Effects of ASF Variations for Loran RNP 0.3
Presented November 2003 at the International Loran Association 32nd Annual Meeting, 2003, Boulder, CO

Luo, Ming, Xie, G., Akos, D., Pullen, S., and Enge, P.
Radio Frequency Interference Validation Testing for LAAS using the Stanford Integrity Monitor Testbed
Presented January 2003 at the Institute of Navigation's National Technical Meeting, Anaheim, CA

Luo, Ming, et. al.
LAAS Ionosphere Spatial Gradient Threat Model and Impact of LGF and Airborne Monitoring
Presented September 2003 at the Institute of Navigation's GPS/GNSS Meeting, Portland, OR

Opshaug, Guttorm
A Leapfrog Navigation System
Ph.D. Dissertation, Stanford University, May 2003

Phelts, R. Eric, Walter, Todd, and Enge, Per
Toward Real-Time SQM for WAAS: Improved Detection Techniques
Presented September 2003 at the Institute of Navigation's GPS/GNSS Meeting, Portland, OR

Phelts, R. Eric, et. al.
Practical Signal Quality Monitoring for Augmentation Systems
Presented November 2003 at the International Symposium on GNSS, Tokyo, Japan

Walter, Todd, Enge, P., and DeCleene, B.
Integrity Lessons from the WAAS Integrity Performance Panel (WIPP)
Presented January 2003 at the Institute of Navigation's National Technical Meeting, Anaheim, CA



2002 (Top)

Alban, Santiago
An Inexpensive and Robust GPS/INS Attitude System for Automobiles
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, OR

Bauregger, F., Walter, T., Akos, D. and Enge, P.
A Novel Dual-Patch Anti-Jam GPS Antenna
Presented June 2002 at the Institute of Navigation's Annual Meeting, Albuquerque, NM

Blanch, J., Walter, T., and Enge, P.
Application of Spatial Statistics to Ionosphere Estimation for WAAS
Presented January 2002 at the Institute of Navigation's National Technical Meeting, San Diego, CA

Blanch, Juan
An Ionospheric Estimation Algorithm for WAAS Based on Kriging
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, OR

Datta-Barua, S., T. Walter, S. Pullen, M. Luo, J. Blanch, and P. Enge
Using WAAS Ionospheric Data to Estimate LAAS Short Baseline Gradients
Presented January 2002 at the Institute of Navigation's National Technical Meeting, San Diego, CA

Hansen, Andrew
Tomogrpahic Estimation of the Ionosphere Using Terrestrial GPS Sensors
Ph.D. Dissertation, March 2002

Jan, S.-S., Gebre-Egziabher, D., Walter, T., and Enge, P.
Worst-Case Analysis of a 3-Frequency Receiver to Land a General Aviation Airplane
Presented January 2002 at the Institute of Navigation's National Technical Meeting, San Diego, CA

Jan, S. S.
Analysis of a Three-Frequency GPS/WAAS Receiver to Land an Airplane
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, OR

Jennings, C., Charafeddine, M., Powell, J.D., and Taamallah, S.
Flight Demonstration of 3D Perspective Synthetic Vision and ADS-B for Closely Spaced Parallel Approaches
Presented Proceedings of the 21st Digital Avionics Systems Conference, Irvine, CA. 2002.

Jennings, C., Powell, J.D.
Flight Test Measurement of Pilot Reaction Times to Runway Incursions: Out-the-Window vs. Synthetic Vision
Presented Proceedings of the 21st Digital Avionics Systems Conference, Irvine, CA. 2002.

Koenig, Michael, Gebre-Egziabher, D., Pullen, S., Kim, U. S., Enge, P., Pervan, B. S., Chan, F. C., and Colby, G.
Sensitivity Analysis of the JPALS Shipboard Relative GPS Measurement Quality Monitor
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, OR

Lo, Sherman, et. al.
WAAS Performance in the 2001 Alaska Flight Trials of the High Speed Loran Data Channel
Presented April 2002 at the IEEE Position Location and Navigation Symposium, Palm Springs, CA

Lo, Sherman
Broadcasting GPS Integrity Information Using Loran-C
Ph.D. Dissertation, July 2002

Lo, Sherman, et. al.
The Loran Integrity Performance Panel
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, OR

Lo, Sherman, et. al.
The Loran Integrity Performance Panel (LORIPP)
Presented October 2002 at the International Loran Association 31st Annual Meeting, 2002, Washington, D.C.

Luo, M., Pullen, S., Akos, D., Xie, G., Datta-Barua, S., Walter, T., and Enge, P.
Assessment of Ionospheric Impact on LAAS Using WAAS Supertruth Data
Presented June 2002 at the Institute of Navigation's Annual Meeting, Albuquerque, NM

Mitelman, A., D. Akos, S. Pullen, and P. Enge
Estimation of ICAO Threat Model Parameters For Operational GPS Satellites
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, OR

Normark, Per-Ludvig, Akos, D., Xie, G., Pullen, S., Luo, M., and Enge, P.
The Integrity Monitor Testbed and Multipath Limiting Antenna Test Results
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, OR

Opshaug, G. and Enge, P.
Integrated GPS and UWB Navigation System
Presented May 2002 at the IEEE UWB Science and Technology (UWBST) Conference, Baltimore, MD

Opshaug, Guttorm
Leapfrog Navigation System
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, OR

Peterson, Benjamin, Enge, Per, Walter, Todd, Lo, Sherman, Boyce, C. O. Lee, Wenzel, Robert and Narins, Mitchell
Hazardously Misleading Information Analysis for Loran LNAV
Presented June 2002 at the 3rd International Symposium on Integration of LORAN-C/Eurofix and EGNOS/Galileo, Munich, Germany

Pullen, S. Luo, M., Xie, G., Lee, J., Phelts, R. E., Akos, D.,and Enge, P.
LAAS Ground Facility Design Improvements to Meet Proposed Requirements for Category II/III Operations
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, OR

Pullen, Sam, Walter, T., and Enge, P.
System Overview, Recent Developments, and Future Outlook for WAAS and LAAS System Overview, Recent Developments, and Future Outlook for WAAS and LAAS
Presented November 11 - 13, 2002, Tokyo University of Mercantile Marine GPS Symposium, Tokyo, Japan

Schloss, P., Phelts, R. Eric, Walter, Todd, and Enge, Per
A Simple Method of Signal Quality Monitoring for WAAS LNAV/VNAV
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, OR



2001 (Top)

Bauregger, F., Walter, T., and Enge, P.
The Dielectric Cavity Antenna - An Alternative to the Choke Ring Antenna
Presented January 2001 at the ION National Technical Meeting, Long Beach, CA

Blanch, J., Walter, T., and Enge, P.
Ionospheric Threat Model Methodology for WAAS
Presented June 2001 at the Institute of Navigation's Annual Meeting, Albuquerque, NM

Elkaim, G. and Parkinson, B.
System Identification for Precision Control of a GPS-Autonomous Catamaran
Presented May 2001 at the International Conference on Integrated Navigation Systems, St. Petersburg, Russia

Elkaim, Gabriel
System Identification for Precision Control of a Wingsailed GPS-Guided Catamaran
Ph.D. Dissertation, Stanford University, December 2001

Enge, P., Fan, Tiwari, Chou, Mann, Sahai, Stone, and Van Roy
Improving GPS Coverage and Continuity: Indoors and Downtown
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, UT

Gebre-Egziabher, D., Powell, J.D., and Enge, P.
Design and Performance Analysis of a Low-Cost Aided Dead Reckoning Navigation System
Presented May 2001 at the International Conference on Integrated Navigation Systems, St. Petersburg, Russia

Gebre-Egziabher, D., Elkaim, G., Powell, J.D., and Parkinson, B.
A Non-Linear, Two-Step Estimation Algorithm For Calibrating Solid-State Strapdown Magnetometers
Presented May 2001 at the International Conference on Integrated Navigation Systems, St. Petersburg, Russia

Holforty, Wendy and Powell, J. David
Flight Deck Display of Airborne Traffic Wake Vortices
Presented 14-18 October 2001 20th DASC Conference, Daytona Beach, FL

Houck, Sharon
Multi Aircraft Dynamics, Navigation and Operation
Ph.D. Dissertation, April 2001

Houck, S. and Powell, J.D.
Assessment of the Probability of a Midair Collision During an Ultra Closely Spaced Parallel Approach
Presented August 2001 at the AIAA Guidance, Navigation and Control Conference, Montreal, Canada

Jan, S. and Enge, P.
Finding Source of Electromagnetic Interference (EMI) to GPS Using a Network of Sensors
Presented January 2001 at the ION National Technical Meeting, Long Beach, CA

Jan, S., Chan, W., Walter, T., and Enge, P.
Matlab Simulation Toolset for SBAS Availability Analysis
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, UT

Lee, J., Pullen, Xie, and Enge
LAAS Sigma-Mean Monitor Analysis and Failure-Test Verification
Presented June 2001 at the Institute of Navigation's Annual Meeting, Albuquerque, NM

LeMaster, E. and Rock, S.
A Local-Area GPS Pseudolite-Based Mars Navigation System
Presented August 2001 at the IEEE 10th International Conference on Advanced Robotics, Budapest, Hungary

Lo, Sherman and Enge, Per
Analysis of the Enhanced LORAN Data Channel
Presented February 2001 at the German Institute of Navigation conference, Bonn, Germany

Luo, M., Akos, Koenig, Opshaug, Pullen, Enge, Erlandson, and Frodge
Testing and Research on Interference to GPS from UWB Transmitters
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, UT

Normark, P., Xie, Akos, Pullen, Luo, Lee, and Enge
The Next Generation Integrity Monitor Testbed (IMT) for Ground System Development and Validation Testing
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, UT

Opshaug, G. and Enge, P.
GPS and UWB for indoor navigation
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, UT

Phelts, Robert Eric
Multicorrelator Techniques for Robust Mitigation of Threats to GPS Signal Quality
Ph.D. Dissertation, June 2001

Phelts, R.E., Mitelman, Pullen, Akos, and Enge
Transient Performance Analysis of a Multicorrelator Signal Quality Monitor
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, UT

Pullen, S., Lee, Luo, Pervan, Chan, and Gratton
Ephemeris Protection Level Equations and Monitor Algorithms for GBAS
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, UT

Vidarsson, L., Pullen, S., Green, G. and Enge, P.
Satellite Autonomous Integrity Monitoring and its Role in Enhancing GPS User Performance
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, UT

Walter, Todd, Hansen, Andrew, and Enge Per
Message Type 28
Presented January 2001 at the ION National Technical Meeting, Long Beach, CA

Xie, G., Pullen, Luo, Normark, Akos, Lee, Enge, and Pervan
Integrity Design and Updated Test Results for the Stanford LAAS Integrity Monitor Testbed
Presented June 2001 at the Institute of Navigation's Annual Meeting, Albuquerque, NM



2000 (Top)

Akos, D., Normark, P-L., Lee, J-T., Gromov, K., Tsui, J., and Schamus, J.
Low Power Global Navigation Satellite System (GNSS) Signal Detection and Processing
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, UT

Barrows, Andrew K. and J. David Powell
Flying a Tunnel-in-the-Sky Display Within the Current Airspace System
Presented January 2000 at the AIAA 38th Aerospace Sciences Meeting, Reno, NV

Fuller, Richard
Aviation Utilization of Geostationary Satellites for the Augmentation of GPS: Ranging and Data Link
Ph.D. Dissertation, Stanford University, May 2000

Fuller, R., Walter, T., and Enge, P.
Burst Mode Message Loss Effects On WAAS Availability
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, UT

Gebre-Egziabher, D. and J. David Powell
A DME Based Area Navigation System for GPS/WAAS Interference Mitigation In General Aviation Applications
Presented March 2000 at the IEEE PLANS conference, San Diego, CA

Gebre-Egziabher, D., Elkaim, G., and J. David Powell
A Gyro-Free Quaternion-Based Attitude Determination System Suitable for Implementation Using Low Cost Sensors
Presented March 2000 at the IEEE PLANS conference, San Diego, CA

Gromov, K., Akos., D., Pullen, S., Enge, P. and Parkinson, B.
GIDL: Generalized Interference Detection and Localization System
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, UT

Hansen, A., Peterson, E., Walter, T., and Enge, P.
Correlation Structure of Ionospheric Estimation and Correlation for WAAS
Presented January 2000 at the Institute of Navigation's NTM, Anaheim, CA

Hansen, A., Blanch, J., Walter, T., and Enge, P.
Ionospheric Correlation Anaysis for WAAS: Quiet and Stormy
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, UT

Houck, S. and Powell, J.D.
Visual, Cruise Formation Flying Dynamics
Presented August 2000 at the AIAA Atmoshpheric Flight Mechanics conference, Denver, CO

Houck, S. and Powell, J.D.
A Parametric Sensitivity Study of Ultra Closely Spaced Parallel Approaches
Presented October 2000 at the Digital Avionics Systems Conference, Philadelphia, PA

Jan, James Shau-Shiun and Per Enge
Using GPS to Synthesize A Large Antenna Aperture When the Elements Are Mobile
Presented January 2000 at ION NTM, Anaheim, CA

Jennings, C. and Powell, J.D.
Synthetic Vision Displays for Instrument Landings and Traffic Awareness - Development and Flight Testing
Presented October 2000 at the Digital Avionics Systems Conference, Philadelphia, PA

Jung, J., Enge, P., and Pervan, B.
Optimization of Cascade Integer Resolution with Three Civil GPS Frequencies
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, UT

LeMaster, E. and Rock, S.
Field Test Results for a Self-Calibrating Pseudolite Array
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, UT

Lo, Sherman and Enge, Per
Broadcasting Data from an SBAS Reference Network over Low Rate Broadcast Channels
Presented March 2000 at the German Institute of Navigation conference, Bonn, Germany

Lo, Sherman and Enge, Per
Broadcasting Data from an SBAS Reference Network over using LORAN
Presented June 2000 at the Institute of Navigation's Annual Meeting, San Diego, CA

Lo, S. and Enge, P.
Data Transmission Using LORAN-C
Presented November 2000 at the 29th Annual Convention and Technical Symposium of the International Loran Association, Washington D.C.

Luo, M., Akos, D., Pullen, S., and Enge, P.
Interference to GPS from UWB Transmitters
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, UT

Mitelman, A., Phelts, R.E., Akos, D., Pullen, S. and Enge, P.
A Real-Time Signal Quality Monitor for GPS Augmentation Systems
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, UT

Opshaug, G. and Enge, P.
Robotic snow cat
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, UT

Phelts, R.E. and Enge, P.
The Case for Narrowband Receivers
Presented January 2000 at ION NTM, Anaheim, CA

Phelts, R.E. and Enge, P.
Multipath Mitigation for Narrowband Receivers
Presented March 2000 at the IEEE PLANS conference, San Diego, CA

Phelts, R.E. and Enge, P.
The Multipath Invariance Approach for Code Multipath Mitigation
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, UT

Phelts, R.E., Akos, D. and Enge, P.
Robust Signal Quality Monitoring and Detection of Evil Waveforms
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, UT

Rabinowitz, M., Parkinson, B., Gromov, K., and Cohen, C.
Architectures for Joint GPS/LEO Satellite Carrier Phase Receivers Designed for Rapid Robust Resolution of Carrier Cycle Ambiguities on Mobile Platorms
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, UT

Rabinowitz, M., Parkinson, and Spilker, J.
Some Capabilities of a Joint GPS-LEO Navigation System
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, UT

Walter, T., Hansen, A., Blanch, J. and Enge, P.
Robust Detection of Ionospheric Irregularities
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, UT



1999 (Top)

Abbott, Eric and David Powell
Land-vehicle Navigation Using GPS
The Proceedings of the IEEE January 1999, vol 87, no 1, pp 145-162

Barrows, A. Alter, K, Jennings, C., and Powell, J.D.
Alaskan Flight Trials of a Synthetic Vision System for Instrument Landings of a Piston Twin Aircraft
Presented April 1999 at the SPIE Enhanced and Synthetic Vision conference, Orlando, FL

Barrows, A. and Powell, J.D.
Tunnel-in-the-Sky Cockpit Display for Complex Remote Sensing Flight Trajectories
Presented June 1999 at the Airborne Remote Sensing conference, Ottawa, Canada

Christie, Jock R. I., Ping-Ya Ko, Andrew Hansen, Donghai Dai, Samuel Pullen, Boris S. Pervan, and Bradford W. Parkinson
The Effects of Local Ionospheric Decorrelation on LAAS: Theory and Experimental Results
Presented January 1999 at ION National Technical Meeting, San Diego, CA

Fuller, Richard A., Todd Walter, Sharon Houck, and Per Enge
Flight Trials of a Geostationary Satellite Based Augmentation System at High Latitudes and for Dual Satellite Coverage
Presented January 1999 at ION National Technical Meeting, San Diego, CA

Gebre-Egziabher, Demoz, Sherman Lo, J. David Powell, and Per Enge
GPS Supplemental Navigation Systems for Use During the Transition to a Sole-Means-GPS National Airspace System
Presented January 1999 at ION National Technical Meeting, San Diego, CA

Gromov, K., Akos., D., Pullen, S., Enge, P., Parkinson, B., and Pervan, B.
Interference Direction Finding for Aviation Applications of GPS
Presented September 1999 at the Institute of Navigation's GPS conference, Nashville, TN

Hayward, Roger, Marchick, Adam, and Powell, J. David
Single Baseline GPS Based Attitude Heading Reference System (AHRS) for Aircraft Applications
Presented June 1999 at the IEEE American Control Conference, San Diego, CA

Houck, S., Barrows, A., Parkinson, B., Enge, P., and Powell, J.D.
Flight Testing WAAS for Use in Closely Spaced Parallel Approaches
Presented September 1999 at the ION GPS conference, Nashville, TN

Jennings, C, Alter, K., Barrows, A., Enge, P., and Powell, J.D.
3-D Perspective Displays for Guidance and Traffic Awareness
Presented September 1999 at the ION GPS conference, Nashville, TN

Jung, Jaewoo
High Integrity Carrier Phase Navigation for Future LAAS Using Multiple Civilian GPS Signals
Presented September 1999 at the Institute of Navigation's GPS conference, Nashville, TN

LeMaster, Ed, and Rock, Stephen
Self-Calibration of Pseudolite Arrays Using Self-Differencing Transceivers
Presented September 1999 at the ION GPS conference, Nashville, TN

Li, Jie, Awele Ndili, Lisa Ward, and Saps Buchman
GPS Receiver Satellite/Antenna Selection Algorithm for the Stanford Gravity Probe B Relativity Mission
Presented January 1999 at ION National Technical Meeting, San Diego, CA

Mitelman, A., Jung, J., and Enge, P.
LAAS Monitoring For A Most Evil Satellite Failure
Presented January 1999 at ION National Technical Meeting, San Diego, CA

Phelts, R.E., Stone, J., Enge, P., and Powell, J.D.
Software-based Multipath Mitigation: Sampling for Multipath Invariance
Presented July 1999 at the 4th International Symposium on Satellite Navigation Technology and Applications, Brisbane, Australia

Stone, Jonathan M., Edward A. LeMaster, J. David Powell, and Stephen Rock
GPS Pseudolite Transceivers and their Applications
Presented January 1999 at ION National Technical Meeting, San Diego, CA

Walter, Todd
WAAS MOPS: Practical Examples
Presented January 1999 at ION National Technical Meeting, San Diego, CA

Walter, Todd, Hansen, Andrew, and Enge, Per
Validation of the WAAS MOPS Integrity Equation
Presented June 1999 at ION Annual Meeting, Cambridge, MA



1998 (Top)

Christie, Jock R. I., Ping-Ya Ko, Boris S. Pervan, Per K. Enge, J. David Powell, Bradford W. Parkinson
Analytical and Experimental Observations of Ionospheric and Tropospheric Decorrelation Effects for Differential Satellite Navigation during Precision Approach
Presented September 1998 at ION GPS Conference, Nashville, TN

Fuller, Richard A., Donghai Dai, Todd Walter, Christopher Comp, Per Enge, J. David Powell
Interoperation and Integration of Satellite Based Augmentation Systems
Presented September 1998 at ION GPS '98, Nashville, Tennessee

Gebre-Egziabher, Demoz, Roger C. Hayward and J. David Powell
A Low-Cost GPS/Inertial Attitude Heading Reference System (AHRS) for General Aviation Applications
Presented at the 1998 IEEE Position, Location and Navigation Symposium - PLANS '98, Palm Springs, CA, April 1998

Hayward, Roger C., Demoz Gebre-Egziabher and J. David Powell
GPS-Based Attitude for Aircraft
Presented at International Conference on Integrated Navigation Systems in St. Petersburg Russia, May 1998

Hayward, Roger C., and J. David Powell
Real Time Calibration of Antenna Phase Errors for Ultra Short Baseline Attitude Systems
Presented at ION GPS '98 - Nashville, Tennessee, September 1998

LeMaster, Ed, and Rock, Stephen
Mars Exploration Using Self-Calibrating Pseudolite Arrays
Presented September 1998 at the ION GPS Conference, Nashville, TN

Ndili, Awele and Per Enge
GPS Receiver Autonomous Interference Detection
Presented at the 1998 IEEE Position, Location and Navigation Symposium - PLANS '98, Palm Springs, CA, April 1998

Pervan, Boris, David Lawrence, Konstantin Gromov, Guttorm Opshaug, Jock Christie, Ping-Ya Ko, Alexander Mitelman, Sam Pullen, Per Enge, and Bradford Parkinson
Flight Test Evaluation of an Alternative Local Area Augmentation System Architecture
NAVIGATION
, Journal of the ION
Journal of the Institute of Navigation, Vol 45, No. 1, Spring 1998, pp. 31-38

Pervan, Boris S., Samuel P. Pullen, and Jock R. Christie
A Multiple Hypothesis Approach to Satellite Navigation Integrity
NAVIGATION
, Journal of the ION
Journal of the Institute of Navigation, Vol 45, No. 1, Spring 1998, pp. 61-71



1997 (Top)

Barrows, A., Alter, K., Enge, P., Parkinson, B., and Powell, J.D.
Operational Experience with and Improvements to a Tunnel-in-the-Sky Display for Light Aircraft
Presented at the ION GPS Conference, Kansas City, MO. September 1997

Christie, Jock R. I., Bradford W. Parkinson, Per K. Enge
A Proposed Signal Design for GNSS2: The Use of Faster and Longer Codes to Provide Real-Time Single Frequency Ionospheric Measurements
Presented at GNSS-97 in Munich, Germany, April 1997

Cobb, Stewart
GPS Pseudolites: Theory, Design, and Applications
Ph.D. Dissertation, Stanford University, 1997

Elkaim, Gabriel, Michael O'Connor, Thomas Bell, B.W. Parkinson
System Identification and Robust Control of Farm Vehicles Using Carrier-Phase Differential GPS
Presented at the ION GPS Conference, Kansas City, MO. September 1997

Evans, Jennifer, Gabriel Elkaim, Sherman Lo, Bradford Parkinson
System Identification of an Autonomous Aircraft using GPS
NAVIGATION
, Journal of the ION
Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 1065-1071.

Hansen, Andrew, YC Chao, Todd Walter and Per Enge
Ionospheric Estimation and Integrity Threat Detection
Presented at ION NTM'97, Santa Monica CA, January 1997

Hansen, Andrew, Todd Walter and Per Enge
Ionospheric Correction Using Tomography
Presented at the ION GPS Conference, Kansas City, MO. September 1997

Hayward, Roger C., Demoz Gebre-Egziabher, Matt Schwall, J. David Powell, and John Wilson
Inertially Aided GPS Based Attitude Heading Reference System (AHRS) for General Aviation Aircraft
Presented at the ION GPS Conference, Kansas City, MO. September 1997

Ndili, Awele and Per Enge
Receiver Autonomous Interference Detection
Presented at the 53rd Annual Meeting of the Institute of Navigation, Albuquerque, New Mexico, June 1997

Pervan, Boris S., Samuel P. Pullen, David G. Lawrence, Konstantin Gromov, Jock R. I. Christie, Guttorm Opshaug, Vicky Lu, Ping-Ya Ko, Per Enge, and Bradford W. Parkinson
Development, Implementation, and Testing of a Prototype LAAS Architecture
Presented at GNSS-97 in Munich, Germany, April 1997

Pervan, Boris, David Lawrence, Konstantin Gromov, Guttorm Opshaug, Jock Christie, Ping-Ya Ko, Alexander Mitelman, Sam Pullen, Per Enge, and Bradford Parkinson
Flight Test Evaluation of a Prototype Local Area Augmentation System Architecture
Presented at the ION GPS Conference, Kansas City, MO. September 1997

Walter, Todd, Per Enge and Andrew Hansen
An Integrity Equation for Use with Space Based Augmentation Systems
Presented at GNSS-97 in Munich, Germany, April 1997



1996 (Top)

Barrows, Andrew K., Per Enge, Bradford W. Parkinson and J. David Powell,
Flying Curved Approaches and Missed Approaches: 3-D Display Trials Onboard a Light Aircraft
Presented at the ION GPS Conference, Kansas City, MO. September 1996

Barrows, Andrew K., Demoz Gebre-Egziabher, Roger Hayward, Renxin Xia, and J. David Powell
GPS-Based Attitude and Guidance Displays for General Aviation
Presented at IEEE Emerging Technologies and Factory Automation '96, Kauai, HI, November 1996

Chao, Yi-chung, Samuel Pullen, P.K. Enge, B.W. Parkinson
Study of WAAS Ionospheric Integrity
NAVIGATION
, Journal of the ION
Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 1996, Kansas City, MO, pp. 781-788

Christie, Jock R. I., Bradford W. Parkinson, Per K. Enge
The Effect of the Ionosphere and C/A Frequency on GPS Signal Shape: Considerations for GNSS-2
Presented at the ION GPS Conference, Kansas City, MO. September 1996

Conway, Andrew, P. Montgomery, S. Rock, R. Cannon, and B.W. Parkinson,
A New Motion-Based Algorithm for GPS Attitude Integer Resolution
NAVIGATION
, Journal of the ION
Journal of the Institute of Navigation, Vol. 43, No. 2, Summer 1996, pp. 179-190

Elkaim, Gabriel, Michael O'Connor, Thomas Bell, B.W. Parkinson,
System Identification of a Farm Vehicle Using Carrier-Phase Differential GPS
Presented at the ION GPS Conference, Kansas City, MO. September 1996

Gazit, Ran
Digital Tracking Filters with High Order Correlated Measurement Noise
IEEEXplore

Aerospace and Electronic Systems, IEEE Transactions in Vol. 33, Issue 1, 1996, pp. 171-177

Lawrence, David G., Stewart Cobb, Boris Pervan, Guttorm Opshaug, Per Enge, J. David Powell, Bradford W. Parkinson,
Performance Evaluation of On-Airport Local Area Augmentation System Architectures
Presented at the ION GPS Conference, Kansas City, MO. September 1996

Lightsey, E. Glenn and Bradford W. Parkinson
GPS Based Attitude Determination On Nonaligned Antenna Arrays
NAVIGATION
, Journal of the ION
Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 1996, Kansas City, MO, pp. 1081-1090

Montgomery, Paul and Bradford W. Parkinson
Carrier Differential GPS for Takeoff to Landing of an Autonomous Aircraft
NAVIGATION
, Journal of the ION
Proceedings of the 1996 National Technical Meeting of The Institute of Navigation, Santa Monica, CA, January 1996

O'Connor, Michael L., Gabriel H. Elkaim, and Bradford W. Parkinson,
Carrier Phase DGPS for Closed-Loop Control of Farm and Construction Vehicles
NAVIGATION
, Journal of the ION
Journal of the Institute of Navigation, Vol 43, No. 2, Summer 1996, pp. 167-178

O'Connor, Michael, Thomas Bell, Gabe Elkaim, and Bradford Parkinson
Automatic Steering of Farm Vehicles Using GPS
Presented at 3rd International Conference on Precision Agriculture, Minneapolis, Minnesota, June 1996

Pullen, Sam, Boris Pervan, Per Enge and Bradford W. Parkinson,
A Comprehensive Integrity Verification Architecture for On-Airport LAAS Category III Precision Landing
Presented at the ION GPS Conference, Kansas City, MO. September 1996

Teague, E. Harris, Jonathan P. How, London G. Lawson, Michael Boerjes, and Bradford W. Parkinson
Techniques for Real-Time Control of Flexible Structures using GPS
Presented at the American Astronautical Society, Guidance, Navigation and Control Conference, Breckenridge, Colorado, Feb. 1996

Teague, E. Harris, Jonathan P. How, and Bradford W. Parkinson
Carrier Differential GPS for Real-Time Control of Large Flexible Structures
Presented at the ION GPS Conference, Kansas City, MO. September 1996

Uematsu, Hirohiko and Bradford W. Parkinson
GPS Receiver Development and Verification Tests for the Stanford Gravity Probe B Relativity Mission - Verification Test Plan and Preliminary Results
NAVIGATION
, Journal of the ION
Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 1996, Kansas City, MO, pp. 1377-1385



1995 (Top)

Abbott, Eric, and David Powell
An Examination of the Relative Merits of Various Sensors for Vehicle Navigation
NAVIGATION
, Journal of the ION
Presented at ION GPS '95, Palm Springs, California. September 1995

Barrows, Andrew, Per K. Enge, Bradford W. Parkinson, David Powell
Flight Tests of a 3-D Perspective-View Glass-Cockpit Display for General Aviation Using GPS
Presented at ION GPS '95, Palm Springs, California. September 1995

Chao, Y.C., Y.J. Tsai, Todd Walter, Changdon Kee, Per Enge, Bradford W. Parkinson
The Ionospheric Model Improvement for the Stanford WAAS Network
NAVIGATION
, Journal of the ION
Presented at the 1995 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 1995
Presented at the AAS Guidance and Control Conference, Keystone, Colorado. February 1995

Chao, Y.C., Y.J. Tsai, Todd Walter, Changdon Kee, Per Enge, Bradford W. Parkinson
An Algorithm for Inter-frequency Bias Calibration and Application to WAAS Ionosphere Modeling
NAVIGATION
, Journal of the ION
Presented at ION GPS '95, Palm Springs, California. September 1995

Cobb, H. Stewart, David G. Lawrence, Boris S. Pervan Clark E. Cohen, J. David Powell, Bradford W. Parkinson
Precision Landing Tests with Improved Integrity Beacon Pseudolites
Presented at ION GPS '95, Palm Springs, California. September 1995

Cobb, H. Stewart, David G. Lawrence, Jock R.I. Christie, Todd F. Walter, Y.C. Chao, J. David Powell, Bradford W. Parkinson
Observed GPS Signal Continuity Interruptions
Presented at ION GPS '95, Palm Springs, California. September 1995

Cohen, Clark E., H. Stewart Cobb, David G. Lawrence, Pervan, Boris S., et. al.
Automatic Landing of a 737 using GNSS Integrity Beacons
Presented at ISPA, Braunschweig Germany, February 1995

Gazit, Ran
Aircraft Tracking using GPS Position and Velocity Reports
NAVIGATION
, Journal of the ION
Presented at ION GPS '95, Palm Springs, California. September 1995

Lawrence, David, Boris Pervan, Clark Cohen, H. Stewart Cobb, J. David Powell, Bradford Parkinson
A Real-Time Architecture for Kinematic GPS Applied to the Integrity Beacon Landing System
Presented at 51st ION meeting in Colorado Springs, Colorado, June 1995

Lawrence, David, H. Stewart Cobb, Clark Cohen, Boris Pervan, J. David Powell, Bradford Parkinson
Maintaining GPS Positioning in Steep Turns Using Two Antennas
NAVIGATION
, Journal of the ION
Presented at ION GPS '95, Palm Springs, California. September 1995

Montgomery, Paul, H. Uematsu, Bradford W. Parkinson
Full State Estimation and Control of a Large Model Aircraft Using Carrier Phase Differential GPS
DSNS Bergen, Norway. April 1995

O'Connor, Michael L., Gabriel H. Elkaim, Bradford W. Parkinson
Kinematic GPS for Closed Loop Control of Farm and Construction Vehicles
Presented at ION GPS '95, Palm Springs, California. September 1995

Parkinson, Bradford W., Thomas Stansell, Ronald Beard, Konstantin Gromov
A History Of Satellite Navigation
NAVIGATION
, Journal of the ION
Journal of the Institute of Navigation, Vol. 42, No. 1, Special Issue. March 1995, pp. 109-164

Pervan, Boris S., Clark E. Cohen, David G. Lawrence, H. Stewart Cobb, J. David Powell, and Bradford W. Parkinson
High Integrity GPS-Based Precision Landing Using Integrity Beacon Pseudolites
Presented at ISPA, Braunschweig Germany, February 1995

Pullen, Samuel P., Per K. Enge, Bradford W. Parkinson
A New Method for Coverage Prediction for the Wide Area Augmentation System (WAAS)
Presented at ION Annual Meeting, Colorado Springs, Colorado. June 1995

Pullen, Samuel P., Per K. Enge, Bradford W. Parkinson
Global Optimization of GPS Augmentation Architectures using Genetic Algorithms
Presented at ION GPS '95, Palm Springs, California. September 1995

Teague, E. Harrison, Jonathan P. How, London G. Lawson, and Bradford W. Parkinson
GPS as a Structural Deformation Sensor
Proceedings of the AIAA Guidance, Navigation and Control Conference, Baltimore, Maryland. August 1995

Tsai, Y.J., Y.C. Chao, Todd Walter, Changdon Kee, David Powell, Per Enge, Bradford W. Parkinson
Evaluation of Orbit and Clock Models for Real Time WAAS
NAVIGATION
, Journal of the ION
Presented at the 1995 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 1995
Presented at the AAS Guidance and Control Conference, Keystone, Colorado. February 1995

Walter, Todd and Per Enge
Weighted RAIM for Precision Approach
Presented at ION GPS-95, Palm Springs, California. September 1995



1994 (Top)

Cobb, H.Stewart, Clark E. Cohen, Bradford Parkinson
Theory and Design of Pseudolites
NAVIGATION
, Journal of the ION
Presented at ION National Technical Meeting. San Diego, CA. January 1994

Cohen, Clark E., Boris Pervan, H. Stewart Cobb, David G. Lawrence, J. David Powell, Bradford W. Parkinson
Achieving Required Navigation Performance using GNSS for Category III Precision Landing
Presented at DSNS-94, London, U.K. April 1994

Cohen, Clark E., E. Glenn Lightsey, Bradford W. Parkinson and William A. Feess
Space Flight Tests of Attitude Determination using GPS
International Journal of Satellite Communications, Vol. 12, 427-433 (1994)

Cohen, Clark E., Boris Pervan, David Lawrence, H. Stewart Cobb, J. David Powell, Bradford W. Parkinson
Real-Time Flight Testing Using Integrity Beacons for GPS Category III Precision Landing
NAVIGATION
, Journal of the ION
Journal of the Institute of Navigation, Vol. 41, No. 2. Summer 1994

Cohen, Clark, David Lawrence, Boris Pervan, H.Stewart Cobb, Andrew Barrows, David Powell, Bradford W. Parkinson, Victor Wullschleger, S. Kalinowski
Flight Test Results of Autocoupled Approaches using GPS and Integrity Beacons
NAVIGATION
, Journal of the ION
Presented at ION GPS '94. Salt Lake City, Utah. September 1994

Gazit, Ran and J. David Powell
Communication Protocols for GPS-based Surveillance and TCAS
NAVIGATION
, Journal of the ION
Presented at ION GPS '94, Salt Lake City, Utah. September 1994

Kee, Changdon, Bradford W. Parkinson
Wide Area Differential GPS as a Future Navigation System in the U.S.
IEEEXplore
Presented at PLANS '94, Las Vegas, NV. April 1994

Kee, Changdon, Bradford W. Parkinson
Calibration of Multipath Errors on GPS Pseudorange Measurements
NAVIGATION
, Journal of the ION
Presented at ION GPS '94. Salt Lake City, Utah. September 1994

Lightsey, E. Glenn, Clark Cohen, William A. Feess, Bradford W. Parkinson
Analysis of Spacecraft Attitude Measurements using Onboard GPS
Presented at AAS Conference, Keystone, CO. February 1994

Lightsey, E. Glenn, Clark Cohen, Bradford W. Parkinson
Development of a GPS Receiver for Reliable Real-Time Attitude Determination in Space
NAVIGATION
, Journal of the ION
Presented at ION GPS '94. Salt Lake City, Utah. September 1994

Montgomery, Paul, Hiro Uematsu, Bradford W. Parkinson
Analysis of Angular Velocity Determination Using GPS
NAVIGATION
, Journal of the ION
Presented at ION GPS '94. Salt Lake City, Utah. September 1994

Ndili, Awele
GPS Pseudolite Signal Design
Presented at ION GPS '94, Salt Lake City, Utah. September. 1994

Pervan, Boris S., Clark Cohen, Bradford W. Parkinson
Autonomous Integrity Monitoring for Precision Approach using DGPS and a Ground-based Pseudolite
Presented at AAS Conference, Keystone, CO. Feb. 1994

Pervan, Boris S., Clark E. Cohen, Bradford W. Parkinson
Integrity in Cycle Ambiguity Resolution for GPS-based Precision Landing
Presented at DSNS-94, London, UK. April 1994

Pervan, Boris, Clark Cohen, David Lawrence, H.Stewart Cobb, J. David Powell, Bradford W. Parkinson
Autonomous Integrity Monitoring for GPS-based Precision Landing using Ground-based Integrity Beacon Pseudolites
NAVIGATION
, Journal of the ION
Presented at ION GPS '94. Salt Lake City, Utah. September 1994

Pullen, Samuel P., Boris Pervan, Bradford W. Parkinson
A New Approach to GPS Integrity Monitoring Using Prior Probability Models and Optimal Threshold Search
Presented at PLANS '94, Las Vegas, NV. April 1994

Pullen, Sam, Per K. Enge, Bradford W. Parkinson
Simulation-Based Evaluation of WAAS Performance: Risk and Integrity Factors
Presented at ION GPS '94, Salt Lake City, Utah. September 1994

Uematsu, Hirohiko, Bradford W. Parkinson
Antenna Baseline and Line Bias Estimation Using Pseudolites for GPS-based Attitude Determination
NAVIGATION
, Journal of the ION
Presented at ION GPS '94. Salt Lake City, Utah. September 1994

Walter, T., Boris Pervan, Per Enge, John Herendeen, Peter Levin
Autonomous Integrity Monitoring and Wide Area DGPS
NAVIGATION
, Journal of the ION
Presented at ION National Technical Meeting, San Diego, CA. January 1994

Walter, Todd; C. Kee, Y.C. Chao, Y.J. Tsai, U. Peled, J. Ceva, A. K. Barrows, E. Abbott, David Powell, Per Enge, and Bradford Parkinson
Flight Trials of the Wide-Area Augmentation Systm (WAAS))
Presented at ION GPS 1994, Salt Lake City, Utah. September 1994



1993 (Top)

Ceva, Juan, Bradford W. Parkinson
Multipath Interference in Orbiting Receivers Due to Earth Surface Reflections
NAVIGATION
, Journal of the ION
Presented at ION GPS '93, Salt Lake City, Utah. September 1993

Chao, Yi-Chung, Bradford W. Parkinson
The Statistics of Selective Availability and Its Effect on Differential GPS
NAVIGATION
, Journal of the ION
Presented at ION GPS '93, Salt Lake City, Utah. September 1993

Cohen, Clark, B. David McNally, Bradford W. Parkinson
Flight Tests of Attitude Determination Using GPS Compared Against an Inertial Navigation Unit
NAVIGATION
, Journal of the ION
Presented at the ION National Technical Meeting, San Francisco, California. January 1993

Cohen, Clark, Boris Pervan, H. Stewart Cobb, Dave Lawrence, J. David Powell, Bradford W. Parkinson
Real-time Cycle Ambiguity Resolution using a Pseudolite for Precision Landing of Aircraft with GPS
Presented at the Second International Symposium on Differential Satellite Navigation Systems, Amsterdam, The Netherlands. March 1993

Cohen, Clark E., Boris S. Pervan, David G. Lawrence, H. Stewart Cobb, J.David Powell, Bradford W. Parkinson
Real-time Flight Test Evaluation of the GPS Marker Beacon Concept for Category III Kinematic GPS Precision Landing
NAVIGATION
, Journal of the ION
Presented at ION GPS '93, Salt Lake City, Utah. September 1993

Cohen, Clark E., E. Glenn Lightsey, Bradford W. Parkinson, William A. Feess
Space Flight Tests of Attitude Determination Using GPS: Preliminary Results
NAVIGATION
, Journal of the ION
Presented at ION GPS '93, Salt Lake City, Utah. September 1993

Kee, Changdon, Bradford W. Parkinson
High Accuracy GPS Positioning in the Continent: Wide Area Differential GPS
Presented at the Second International Symposium on Differential Satellite Navigation Systems, Amsterdam, The Netherlands. March 1993

Kee, Changdon, Bradford W. Parkinson
Static Test Results of Wide Area Differential GPS
NAVIGATION
, Journal of the ION
Presented at ION GPS '93, Salt Lake City, Utah. September 1993

Lightsey, E. Glenn, Clark E. Cohen, Bradford W. Parkinson
Application of GPS Attitude Determination to Gravity Gradient Stabilized Spacecraft
ABSTRACT

Aerospace Research Central AIAA

Presented at AIAA Guidance and Control Conference, Monterey, California, August 1993

Pervan, Boris S., Clark E. Cohen, Bradford W. Parkinson
Autonomous Integrity Monitoring for Precision Approach using DGPS and a Ground-based Pseudolite
NAVIGATION
, Journal of the ION
Presented at ION GPS '93, Salt Lake City, Utah. September 1993

Teague, Harris, Bradford W. Parkinson
Translation, Rotation and Vibration Control of Large Space Structures using Self-differential GPS (SDGPS)
Presented at the 16th Annual AAS Guidance and Control Conference, Keystone, Colorado. February 1993



1992 (Top)

Cohen, Clark, Bradford W. Parkinson
Integer Ambiguity Resolution of the GPS Carrier for Spacecraft Attitude Determination
Presented at 15th Annual AAS Guidance and Control Conference, Keystone, Colorado. February 1992

Cohen, Clark, Boris Pervan, Bradford W. Parkinson
Estimation of Absolute Ionospheric Delay Exclusively through Single-Frequency GPS Measurements
NAVIGATION
, Journal of the ION
Presented at ION GPS '92, Albuquerque, New Mexico. September 1992

Cohen, Clark, H. Stewart Cobb, Bradford W. Parkinson
Generalizing Wahba's Problem for High Output Rates and Evaluation of Static Accuracy using a Theodolite
NAVIGATION
, Journal of the ION
Presented at ION GPS '92, Albuquerque, New Mexico. September 1992

Cohen, Clark, Bradford W. Parkinson
Aircraft Applications of GPS-based Attitude Determination
ABSTRACT
NAVIGATION
, Journal of the ION
Presented at ION GPS '92, Albuquerque, New Mexico. September 1992

Kee, Changdon, Bradford W. Parkinson
Algorithms and Implementation of Wide Area Differential GPS
NAVIGATION
, Journal of the ION
Presented at ION GPS '92, Albuquerque, New Mexico. September 1992



1991 (Top)

Cohen, Clark, Bradford W. Parkinson
Mitigating Multipath Error in GPS-based Attitude Determination
Presented at the 14th Annual AAS Guidance and Control Conference, Keystone, Colorado. February 1991

Cohen, Clark, Bradford W. Parkinson
Expanding the Performance Envelope of GPS-Based Attitude Determination
NAVIGATION
, Journal of the ION
Presented at ION/GPS Conference, Albuquerque, New Mexico. September 1991



1990 (Top)

Kee, Changdon, Bradford W. Parkinson, Penina Axelrad
Wide Area Differential GPS, Outstanding Paper Award Winner
NAVIGATION
, Journal of the ION
Presented at ION Satellite Division 3rd International Technical Meeting, Colorado Springs, Colorado. September 1990

Parkinson, Bradford W., Penina Axelrad
Techniques for Autonomous GPS Integrity Monitoring
Published by Advisory Group for Aerospace Research and Development (AGARDograph, No. 314). June 1990



1989 (Top)



1988 (Top)

Parkinson, Bradford W., and Penina Axelrad
A Basis for the Development of Operational Algorithms for Simplified GPS Integrity Checking
Presented at The Institute of Navigation National Technical Meeting. January 26-29, 1988

Parkinson, Bradford W., Kevin T. Fitzgibbon
Aircraft Automatic Landing Systems Using GPS (Invited paper)
Proceedings of the International Congress of Navigation Societies, Sidney Australia. February 1988

Parkinson, Bradford W., and Penina Axelrad
Receiver Autonomous Integrity Monitoring of the Navigation Service Provided by the Global Positioning System
Report submitted to the US Department of Transportation. May 1988

Parkinson, Bradford W., Penina Axelrad
Autonomous GPS Integrity Monitoring Using the Pseudorange Residual
NAVIGATION
, Journal of the ION
Journal of the Institute of Navigation, Vol. 35, No. 2. Summer 1988



1987 and prior years (Top)

Beser, Jacques, and Bradford W. Parkinson
The Application of NAVSTAR Differential GPS in the Civilian Community
NAVIGATION
, Journal of the ION
Journal of the Institute of Navigation, Vol. 29, No. 2. Summer 1982

Klein, Dale, Bradford W. Parkinson
The Use of Pseudo-Satellites for Improving GPS Performance
NAVIGATION
, Journal of the ION
Journal of the Institute of Navigation, Vol. 31, No. 4. Winter 1984-1985

Parkinson, Bradford W., and S. W. Gilbert
NAVSTAR: Global Positioning System - Ten Years Later
IEEEXplore
Proceedings of the IEEE, Vol. 71, No. 10, p. 1177-1186. October 1983

Parkinson, Bradford W., Kevin T. Fitzgibbon
Optimal Locations of Pseudolites for Differential GPS
NAVIGATION
, Journal of the ION
Journal of the Institute of Navigation, Vol. 33, No. 4. Winter 1986-1987

Parkinson, Bradford W., Penina Axelrad
Simplified GPS Integrity Checking with Multiple Satellites
Presented at the Institute of Navigation Annual Conference, Dayton, Ohio. June 1987

Parkinson, Bradford W., Penina Axelrad
A Basis for the Development of Operational Algorithms for Simplified GPS Integrity Checking
Presented at the Institute of Navigation Satellite Division, First Technical Meeting, Colorado Springs. September 1987



 

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