Investigation of New Criteria for Fault Detection (FD) and Fault Detection and Exclusion (FDE) Functions to Obtain Higher Availability

Young C. Lee

Abstract:	At the request of the FAA, the JHU/APL did a study to answer the question of whether GPS and augmented GPS could provide a sole-means navigation capability. While their answer was in the affirmative, they recommended a number of things. One of the recommendations was that for use of stand-alone GPS, investigation be made to improve the Receiver Autonomous Integrity Monitoring (RAIM) algorithm * , and a suggestion was made implicitly that a Kalman filter approach be used rather than a snapshot-based RAIM algorithm. This paper addresses these issues raised in the JHU/APL report in three aspects. · It addresses the JHU/APL suggestion for use of a Kalman filter approach · It then relates the availability and continuity requirements to Fault Detection (FD) and Fault Detection and Exclusion (FDE) functions at the algorithm level · It proposes and investigates new criteria for FD and FDE function availability to see if they could bring improved availability and continuity without an operational impact. The principal findings of the paper are as follows: · Use of a snapshot-based RAIM is preferred · The FDE availability requirement of 0.99999 used as a criterion for sole means navigation in the JHU/APL report is too conservative · The new criteria for determining whether FD and FDE functions exist improve the availability only by a small amount.
Published in:	Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999) June 27 - 30, 1999 Royal Sonesta Hotel Cambridge, MA
Pages:	771 - 778
Cite this article:	Lee, Young C., "Investigation of New Criteria for Fault Detection (FD) and Fault Detection and Exclusion (FDE) Functions to Obtain Higher Availability," Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999), Cambridge, MA, June 1999, pp. 771-778.
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