Comparison of FDE and FDI RAIM Algorithms for GPS

R. Grover Brown, John H. Kraemer and Giau C. Nim

Abstract:	A failure detection and exclusion (FDE) algorithm is being considered by RTCA Special Committee 159 as its baseline RAIM method for sole-means navigation. This is in contrast to the more conventional failure detection and isolation (FDI) algorithm where the failed satellite is explicitly identified and then removed from the navigation solution. The difference between the two algorithms is signiticant, especially in the S- and g-in-view cases. Results of an extensive Monte Carlo study comparing FDE and FDI are presented. It is concluded that both FDE and FDI are workable algorithms that can be made to meet the RTCA specifications, provided that there is proper screening of satellite geometries for admissibility. However, both algorithms have relatively poor availability, especially for nonprecision approach. A new algorithm which takes advantage of the best features of both FDE and FDI is also presented. This algorithm shows promise of significant improvement in availability over either FDE or FDI.
Published in:	Proceedings of the 1994 National Technical Meeting of The Institute of Navigation January 24 - 26, 1994 Catamaran Resort Hotel San Diego, CA
Pages:	51 - 60
Cite this article:	Brown, R. Grover, Kraemer, John H., Nim, Giau C., "Comparison of FDE and FDI RAIM Algorithms for GPS," Proceedings of the 1994 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 1994, pp. 51-60.
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