GPS Integrity Channel RTCA Working Group Recommendations

Rudolph M. Kalafus

Abstract:	The Radio Technical Commission for Aeronautics Special Committee 159 (RTCA/SC-159} recently established a working group to address the design of a wide-area service to provide rapid and frequent indications of the health of the GPS satellites. The GPS Integrity Channel Working Group has met over the last year to recommend a system architecture which would provide 10 second warning of any deterioration of service that caused the navigation Guidance accuracy to be outside the limits for non-precision approach. The architecture selected was also to enable international implementation of the service. These requirements can be satisfied by a sparse ground monitoring network sending Integrity messages through a satellite communication link. The working group considered the trade-offs between placing the decision burden on the ground subsystem versus placing it on the avionics processor. The working group recommendations call for the broadcast of. a coarse range measurement for each satellite: this enables the onboard GPS receiver to determine positively whether the GPS navigation accuracy is within prescribed limits. The paper discuses the tradeoffs, message content, data throughout requirements. and data link considerations.
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:	419 - 428
Cite this article:	Kalafus, Rudolph M., "GPS Integrity Channel RTCA Working Group Recommendations," Proceedings of the International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1988), Colorado Spring, CO, September 1988, pp. 419-428.
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