TA-12 RAIM Test Results and Analysis

Lawrence Lupash, Joseph Wlad

Abstract:	This paper documents the analyses and testing required to demonstrate compliance with the integrity requirements specified in RTCA/DO-208, TSO-C129a, and RTCA/DO-229 of a Precise Positioning Service (PPS) GPS receiver called the Trimble TA-12. Compliance with Federal Aviation Administration requirements imposes additional testing burdens for PPS equipment that use a weighted least-squares algorithm even though the same integrity algorithm is used in both modes. Off-line and on-line tests are required in both SPS and PPS modes since the satellite range errors are smaller in PPS conditions. The performance of the TA-12 PPS/SPS RAIM algorithm is presented with respect to FAA requirements. The results presented in this paper include analyses of RAIM detection availability, RAIM exclusion availability, missed detection, failed exclusion, and false alarm rates, for PPS and SPS modes in all phases of flight (non-precision approach, terminal, en route and oceanic). The test methods cited herein generally follow those prescribed by the Federal Aviation Administration. The TA-12 test results satisfy the DO-208 and DO-229 integrity requirements. In addition, test results for the Horizontal Uncertainty Limit (HUL, as defined in RTCA DO-229) implementation and barometric altimeter usage (based on sub-weighted VDOP criteria) are included. As expected, the results show that PPS FDE has operational advantages with respect to SPS FDE mainly due to the difference in User Equivalent Range Error (UERE).
Published in:	Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999) June 27 - 30, 1999 Royal Sonesta Hotel Cambridge, MA
Pages:	547 - 555
Cite this article:	Lupash, Lawrence, Wlad, Joseph, "TA-12 RAIM Test Results and Analysis," Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999), Cambridge, MA, June 1999, pp. 547-555.
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