GPS-Based Attitude and Guidance Displays
for General Aviation

Andrew K. Barrows, Demoz Gebre-Egziabher, Roger Hayward
Renxin Xia and J. David Powell

Department of Aeronautics and Astronautics
Stanford University

Presented November 1996 at IEEE Emerging Technologies and Factory Automation '96, Kauai, HI

ABSTRACT

GPS was used with a short baseline (1 and 2 wavelengths) triple antenna configuration to obtain attitude in conjunction with solid state rate gyros. The system was used to provide an inexpensive Attitude-Heading Reference System (AHRS) for use by small General Aviation aircraft. The gyros enabled a high bandwidth output while the GPS was used to estimate the gyro drift rate. The resulting attitude information was used, along with GPS-based position, by a graphical "out-the-window" view with tunnels indicating the desired path in the sky for the current phase of flight. Accuracy and ease of flying are enhanced by the system. GPS was used with a short baseline

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