Availability of Positioning and Receiver Autonomous Integrity Monitoring for the Global Positioning System

Paul A. Kline

Abstract:	The Minimum Operational Performance Standards IMOPS) are beina develooed for airborne supplemental navigation equipment using the Global Positioning System (GPS) [l]. This is a unique task in the sense. that-the receiver must provide integrity assurance independent of that supplied by GPS. Independent integrity assurance, or receiver autonomous integrity monitoring (RAIM), requires at least one redundant GPS measurement. Therefore, the availability of GPS depends on the availability of RAIM. A computer simulation is vresented for determinina RAIM availability for- GPS which incorporates a GPS coverage model and a Markov reliability model. The Markov model is used to -assign state probabilities to GPS failure scenarios. Up to six simultaneous satellite failures are considered. A parametric analysis is presented to determine the effect on GPS RAIM availability. Some parameters that are included in the analysis are the maximum allowable Horizontal Dilution of Precision WDOP1 , the Mean Time To Repair (MTTR) for failed GPS satellites, and the addition or omission of the altimeter as an additional measurement.
Published in:	Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990) September 19 - 21, 1990 The Broadmoor Hotel Colorado Spring, CO
Pages:	555 - 562
Cite this article:	Kline, Paul A., "Availability of Positioning and Receiver Autonomous Integrity Monitoring for the Global Positioning System," Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990), Colorado Spring, CO, September 1990, pp. 555-562.
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