Optimization of Position Domain Relative RAIM

Young C. Lee

Abstract:	The GNSS Evolutionary Architecture Study (GEAS) Panel was formed by the FAA in October 2006 with the objective of evaluating future GNSS-based architectures to provide robust worldwide instrument approach guidance known as LPV-200 in the 2025 to 2030 time frame. One of the architectures being considered by GEAS is based on a new concept called Relative Receiver Autonomous Integrity Monitoring (RRAIM). In this architecture, RRAIM is implemented in aircraft and is used in conjunction with an SBAS-like system possibly with a reduced number of ground reference stations, or an integrity-assured GPS III system that meets all LPV-200 requirements except for the integrity time-to-alert (TTA) requirement. RRAIM fills the time gap between the required TTA and the TTA assured by GPS III (or SBAS augmentation) by propagating the most recent integrityassured position solution to the current time using accumulated carrier phase single differences of range measurements. RRAIM gives significantly higher service availability than can be obtained with stand-alone Absolute RAIM (ARAIM). While a position domain RRAIM method was previously presented by the author, the focus of this paper is to refine the RRAIM formulas in order to further improve the LPV-200 service availability with RRAIM.
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	1299 - 1314
Cite this article:	Lee, Young C., "Optimization of Position Domain Relative RAIM," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 1299-1314.
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