Andrew's GPS/Ionosphere Exploratorium

Iono stuff

Alaska flight tests

WAAS ionospheric disturbances
(includes 4 May 1998 storm)

L1/L2 bias calibration

Ionospheric estimation

WAAS system metrics (scripts now available)

GPS clock/SA anomaly


I'm currently a PhD candidate in the Department of Electrical Engineering at Stanford University working on GPS applications in the Wide Area Differential GPS Laboratory. My focus is on ionospheric estimation using GPS. Have a look at my cv for a little more detail about me or hit the exploratorium for a lot more detail on the things I'm doing with GPS. If you want to catch me in person check in Durand 060.
Most of the papers below are online (LaTeX2html). In order to provide a lossless reproduction without burning my disk space and your bandwidth almost all of the download versions of papers and vugraphs are gzipped PostScript, i.e. click on the trailing description and use Save As to download the compressed document if your browser does not have a gzip helper already activated. If you have trouble drop me an email...
Get Acroread Adobe® Acrobat® Reader is needed to view/print the pdf files on this page, hit the icon to download a free copy if you don't have it.

Some papers

  • Ionospheric Correlation Analysis for WAAS: Quiet and Stormy (ION GPS-00) [gzipped PostScript]
  • Correlation Structure of Ionospheric Estimation and Correction for WAAS (ION NTM-00) [gzipped PostScript] [PDF]
  • Real-time Ionospheric Tomography Using Terrestrial GPS Sensors (ION GPS-98 Student Competition, winner) [pdf, gzipped PostScript] --- (modified version in pdf for Navigation, Red Book on WAAS)
  • GPS Satellite Clock Event on SVN 27 and Its Impact on Augmented Navigation Systems (ION GPS-98)
  • Ionospheric Correction Using Tomography (ION GPS-97) [gzipped PostScript]
  • A Proposed Integrity Equation for WAAS MOPS (ION GPS-97) [gzipped PostScript]
  • An Integrity Equation for Use with Space Based Augmentation Systems (GNSS-97)
  • Ionospheric Estimation and Integrity Threat Detection (ION NTM-97) [gzipped PostScript]
  • Ionospheric Corrections for GPS (white paper) [gzipped PostScript]
  • Tomographic Estimation of the Ionosphere (white paper) [gzipped PostScript]
  • Computerized Ionospheric Tomography (white paper) [gzipped PostScript]
  • An Implementation of the Boundary Element Method for Two-dimensional and Axi-Symmetric Problems in Electrostatics (MS thesis, 1992) [gzipped PostScript]
  • On Conforming Delaunay Mesh Generation (Advances in Engineering Software, 1991) [gzipped PostScript]
  • GPS papers from Stanford

  • Some presentations (gzipped PostScript and PDF)

  • Ionospheric Correlation Analysis for WAAS: Quiet and Stormy (Presented at ION GPS-00) [gzipped PostScript]
  • Correlation Structure of Ionospheric Estimation and Correction for WAAS (Presented at ION NTM-00) [gzipped PostScript]
  • GPS Satellite Clock Event on SVN 27 and Its Impact on Augmented Navigation Systems (Presented at ION GPS-98)
  • WAAS Ionospheric Correction Comparison [gzipped PostScript]
  • Ionospheric Research at Stanford (Presented 30 June 1998, FAA Program Office) [gzipped PostScript]
  • Stanford WAAS Iono Research (Presented 3 June 1998, R&D Adv. Board)
  • Tomographic Estimation of the Ionosphere Using Terrestrial GPS Sensors
  • Tomographic Estimation of the Ionosphere with Dual Wide Lane GPS
  • The Promise of a Third GPS Frequency (Presented 9 Dec 1997, AGU Fall Mtg.)
  • Software Calibration of GPS Receiver Interfrequency Bias
  • Ionospheric Estimation and Integrity Threat Detection

  • Some people

  • Prof. Per Enge, (advisor)
  • Stephen Boyd, (co-advisor)
  • Peter Levin, (former advisor, WPI)
  • Todd Walter
  • W.Garth Smith
  • Erik Reddington

  • Some links

  • Stanford WADGPS Lab (Stanford, CA)
  • Stanford GPS Lab (Stanford, CA)
  • Institute of Navigation (Alexandria, VA)
  • GPS/MET (UCAR) (Boulder, CO)
  • MetaVR (Brookline, MA)

  • Some previous employers/universities

  • Trimble Navigation, Ltd. (Sunnyvale, CA)
  • TASC, Inc. (Reading, MA)
  • Worcester Polytechnic Institute (Worcester, MA)--ECE Dept.
  • Nebraska Wesleyan University (Lincoln, NE)
  • my online cv (or PostScript for download)

  • WADGPS GP-B Electrical Engineering School of Engineering Stanford University Search

    ahansen@stanford.edu
    496 Lomita Mall, Room 250
    Stanford, CA 94305-4035
    (650) 723-6754 (voice)
    (650) 725-5517 (fax)

    Last modified: Mon Oct 2 22:48:02 PDT 2000
    © 1998, Andrew Jakob Hansen