GAIM - Ground Augmented Integrity Monitoring for GPS

Marie E. Lage and Bryant D. Elrod

Abstract:	The FAA is investigating the GPS Integrity Broadcast / Wide-Area Differential GPS (GIBWADGPS) approach for augmenting GPS to meet integrity warning requirements and to support Cat I or “near” Cat I precision approaches. The initial focus in developing a GIB/WADGPS testbed is on providing integrity for non- precision approach and less demanding phases of flight. A proposed Ground Augmented Integrity Monitoring (GAIM) method is being tested which determines the GPS satellites’ integrity status on the ground and provides the users with “GO/NO-GO” integrity status data pertinent to defined phases of flight for all satellites being tracked. Future plans for the GIBIWADGPS testbed include the implementation of a Differential GPS Integrity Broadcast (DGIB) method, as proposed by RTCA SC159, to satisfy the integrity requirements. This paper presents the GAIM algorithm as currently implemented in the GIBWADGPS testbed and a performance analysis including initial test results. In addition, the performance of the DGIB and RAIM integrity methods will be presented and implementation considerations for all three methods will be discussed.
Published in:	Proceedings of the 1993 National Technical Meeting of The Institute of Navigation January 20 - 22, 1993 Parc 55 Hotel San Francisco, CA
Pages:	497 - 505
Cite this article:	Lage, Marie E., Elrod, Bryant D., "GAIM - Ground Augmented Integrity Monitoring for GPS," Proceedings of the 1993 National Technical Meeting of The Institute of Navigation, San Francisco, CA, January 1993, pp. 497-505.
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