Work Performed in the United Kingdom to Establish the Feasibility of RAIM in a GPS Receiver in Flight

Michael J.A. Asbury, Charles S. Dixon, Rolf Johannessen

Abstract:	This paper reports on RAIM related work done in the United Kingdom since the last ION-GPS conference in 1990. The paper deals with two aspects. Firstly, earlier work quantifying the benefit and limitations of barometric aiding to GPS is extended. The RAIM availability enhanced with such aiding is described. It is concluded that such aiding gives a boost to the system by reducing the unavailability of RAIM from around 15% to around 1%. This may be sufficient for Supplemental Means navigation but insufficient for Sole Means navigation. The sensitivity of these un-availabilities to accepted geometries is also shown. Secondly, the analysis is enhanced in its realism by considering the computer modelled RAIM performance of a receiver in an aircraft with a dynamic profile that simulates a flight along a specified track. This track is a composite of short and long haul operations and includes bank and pitch motion as well as the long straight flight segments. During these flights, ramp errors are considered along with the normal time dependent errors. In this environment the system’s ability to detect a satellite malfunction by 5 channel RAIM is explored. The paper shows the false alarm rates and the undetected error rates that are likely to be achieved.
Published in:	Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991) September 11 - 13, 1991 Albuquerque, NM
Pages:	789 - 800
Cite this article:	Asbury, Michael J.A., Dixon, Charles S., Johannessen, Rolf, "Work Performed in the United Kingdom to Establish the Feasibility of RAIM in a GPS Receiver in Flight," Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991), Albuquerque, NM, September 1991, pp. 789-800.
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