Integrated GPS/GLONASS for Reliable Receiver Autonomous Integrity Monitoring (RAIM)

Mark A. Sturza and Alison K. Brown

Abstract:	GPS integrity monitoring is key to obtaining FAA approval for civil aviation use in the National Air Space (NAS). Receiver autonomous integrity monitoring (RAIM) is the simplest and most cost effective technique currently available. The performance requirements for integrity monitoring have been established by the Radio Technical Commission for Aeronautics (RTCA) Special Committee 159. RAIM availability is defined as the fraction of space and time that adequate geometry is provided by the satellite constellation to provide reliable integrity monitoring consistent with the requirements for the phase of flight. RAIM availability for the GPS 21 Satellite Primary Constellation, the operational GLONASS constellation, and the Integrated GPS/GLONASS constellation is evaluated in this paper. It is shown that after 3 satellite failures the individual GPS and GLONASS constellations RAIM availability degrades to 92% for enroute and terminal phases of flight and 87% for nonprecision approach. The Integrated GPS/GLONASS constellation is shown to provide 100% RAIM availability for all phases of flight even after six satellite failures (3 GPS and 3 GLONASS).
Published in:	Proceedings of the 46th Annual Meeting of The Institute of Navigation (1990) June 26 - 28, 1990 Atlantic City, NJ
Pages:	9 - 13
Cite this article:	Sturza, Mark A., Brown, Alison K., "Integrated GPS/GLONASS for Reliable Receiver Autonomous Integrity Monitoring (RAIM)," Proceedings of the 46th Annual Meeting of The Institute of Navigation (1990), Atlantic City, NJ, June 1990, pp. 9-13.
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