Algorithms for a GPS Integrity Channel

Alison Brown, Chuck Fosha

Abstract:	The design and development of a GPS Integrity Channel (GIC) is presently under consideration for broadcasting GPS integrity data to civil users of GPS. The GIC system would consist of ground monitor stations to track the GPS satellite signal errors, a master station to compute the GPS user's error, and a communication link to broadcast the integrity data to users. The purpose of the GIC is to determine, or assist the user in determining, the GPS Signal-derived Position Error (SPE). The SPE is defined as the projected horizontal position error at t/e user, induced by the GPS signal-in-space errors which include Control Segment, Space Segment and propagation errors. This includes the effect of the satellite geometry and signal-in-space errors, but not any signal errors introduced by the receiver itself. A variety of different architectures have been proposed for a GIC. This paper describes the algorithms used to determine the GPS integrity with the different GIC architectures. A comparative analysis of the relative processing requirements and performance benefits of the different algorithms under consideration is provided.
Published in:	Proceedings of the International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1988) September 19 - 23, 1988 The Broadmoor Hotel Colorado Spring, CO
Pages:	433 - 440
Cite this article:	Brown, Alison, Fosha, Chuck, "Algorithms for a GPS Integrity Channel," Proceedings of the International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1988), Colorado Spring, CO, September 1988, pp. 433-440.
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