RAIM Performance: How Algorithms Differ

P.B. Ober

Abstract:	Pilots that want to fly Basic Area Navigation in ECAC airspace using stand-alone GPS will be required to check the availability of RAIM for the intended flight (route and time) before taking off. One means of doing this is by using the RAIM availability prediction software AUGUR, that has been developed by STASYS Limited for EUROCONTROL. The design of the AUGUR algorithm has been done by Delft University. The paper describes the considerations that have played a role in the selection of the RAIM prediction algorithm for AUGUR. One of the difficulties faced was to accommodate a wide range of different receivers with unknown RAIM implementations. The approach followed is to first categorise existing RAIM algorithms in a systematic way, to describe where they differ and what implications this has for their predicted performance. The resulting insights are then used to select an algorithm that obeys the requirements that are set by the JAA.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	2021 - 2030
Cite this article:	Ober, P.B., "RAIM Performance: How Algorithms Differ," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 2021-2030.
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