PPS Fault Detection and Exclusion Algorithm and On-Line Test Results for the C-141

Steve Aspey, Mark Phipps, Jon Feist, Eddie Thompson

Abstract:	A great deal of work has been performed on algorithms for GPS Receiver Autonomous Integrity Monitoring (RAIM) and their performance. For the most part, this work has dealt with Standard Positioning Service (SPS) RAIM algorithms and their simulated off-line performance. This paper describes the military Precise Positioning Service (PPS) Fault Detection and Exclusion (FDE) algorithm to be used on the C-141 aircraft and presents results from the on-line RTCA/DO-208 tests. Performance results are compared to RTCA/DO-208 requirements and global fault detection availability for en route, terminal, and nonprecision approach (NPA) operation. The 746th Test Squadron’s Navigation Test and Evaluation Laboratory (NavTEL) was to conduct the 150 RTC/DO-208 PPS static and dynamic test cases under inadmissible, marginal, and good geometric conditions. Ten additional SPS cases were conducted using the most stringent test conditions to characterize unkeyed FDE performance. C-141 PPS and SPS worldwide fault detection availability performance was evaluated off-line using both the Optimal 21 and Baseline 24 constellations at various levels of PPS pseudorange accuracy. On-line test results and global fault detection availability analysis demonstrate the excellent performance of the C-141 GPS PPS FDE algorithm. In addition, the results show the performance increase of PPS FDE with respect to SPS FDE.
Published in:	Proceedings of the 1998 National Technical Meeting of The Institute of Navigation January 21 - 23, 1998 Westin Long Beach Hotel Long Beach, CA
Pages:	67 - 78
Cite this article:	Aspey, Steve, Phipps, Mark, Feist, Jon, Thompson, Eddie, "PPS Fault Detection and Exclusion Algorithm and On-Line Test Results for the C-141," Proceedings of the 1998 National Technical Meeting of The Institute of Navigation, Long Beach, CA, January 1998, pp. 67-78.
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