RAIM: Will It Meet The RTCA GPS Minimum Operational Performance Standards?

R. Grover Brown, Gerald Y. Chin and John H. Kraemer

Abstract:	The Radio Technical Commission for Aeronautics (RTCA) is now close to issuing GPS Minimum Operational Performance Standards (MOPS) for supplemental navigation. This will be the result of nearly two years of deliberations by RTCA Special Committee 159. GPS integrity has been one of the major issues throughout the committee's discussions. It now appears that a GPS Integrity Channel (GIC) is still a few years away, so some form of Receiver Autonomous Integrity Monitoring (RAIM) will have to suffice in the meantime. The integrity specifications of the tentative MOPS are discussed in the paper, and the subtleties in some of the definitions of terms are explained. The results of extensive RAIM simulations are presented for a modified least-squares-residuals method of failure detection. These results show that pure RAIM (not aided with outside measurements) will meet all the tentative specifications with the 21- Primary Satellite Constellation (24 healthy satellites). Furthermore, the simulations show that RAIM assisted simply with baro-altitude measurements will give excellent performance and availability for the lesser Optimal 21 system (21 satellites). The final conclusion is that RAIM, perhaps assisted with baro-aiding or some other aiding source, will serve the civil aviation community quite will for GPS supplemental navigation.
Published in:	Proceedings of the 1991 National Technical Meeting of The Institute of Navigation January 22 - 24, 1991 Sheraton San Marcos Hotel Phoenix, AZ
Pages:	103 - 111
Cite this article:	Brown, R. Grover, Chin, Gerald Y., Kraemer, John H., "RAIM: Will It Meet The RTCA GPS Minimum Operational Performance Standards?," Proceedings of the 1991 National Technical Meeting of The Institute of Navigation, Phoenix, AZ, January 1991, pp. 103-111.
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