A Partial Identification RAIM Algorithm for GPS Sole Means Navigation

R. Grover Brown, John Kraemer, Giau Nim

Abstract:	In the usual failure detection and isolation (FDI) RAIM algorithm, the failed satellite is first detected and then removed from the navigation solution. A new algorithm is proposed here which does not attempt to isolate the individual failed satellite; rather, it limits its search to finding a pair of satellites containing the failed one, and then the pair is eliminated. This results in considerable improvement in availability relative to that which can be obtained with either FDI or the failure detection and exclusion (FDE) algorithm being considered by RTCA Special Committee 159 as its baseline RAIM method for sole means navigation. Criteria for screening out bad geometries for the new algorithm have been worked out and verified by extensive Monte Carlo simulation. Also, availability percentages using the new algorithm are given for en route, terminal and nonprecision approach phases of flight.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	557 - 566
Cite this article:	Brown, R. Grover, Kraemer, John, Nim, Giau, "A Partial Identification RAIM Algorithm for GPS Sole Means Navigation," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 557-566.
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