Use of Low-Cost GPS/AHRS with Head-Up Guidance Systems for CAT III Landings

R.S.Y. Young, P.Y.C. Hwang, D.A. Anderson

Abstract:	Tightly-coupled GPS/AHRS (Attitude and Heading Reference System) sensors can be used as a low cost alternative to the higher-priced Inertial Reference Systems (IRS) for various aviation applications. One such prospective application is in the support of Head-Up Guidance Systems (HGS). However, due to the inadequate GPS Signal-In-Space integrity for safety-critical applications, such as HGS, the GPS/AHRS navigation solution requires proper integrity monitoring before they can be used with HGS for CAT III landings. In this paper, we propose a systematic approach to resolve the GPS integrity issue and to enable the use of GPS/AHRS with HGS for CAT III landings. The Receiver Autonomous Integrity Monitoring (RAIM) technique is adapted to ensure very high integrity in the velocity from GPS/AHRS. In addition, the integrity of the ground speed is cross-monitored by an innovative algorithm utilizing the Instrument Landing Systems (ILS), which is used by HGS to provide position guidance. The configuration of the hardware-in-the-loop simulation and evaluation results of the proposed design will also be presented.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	908 - 919
Cite this article:	Young, R.S.Y., Hwang, P.Y.C., Anderson, D.A., "Use of Low-Cost GPS/AHRS with Head-Up Guidance Systems for CAT III Landings," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 908-919.
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