GPS Continuity: Initial Findings

Jean Marie Durand and Thierry Marcel Carlier

Abstract:	This paper refines the definition of continuity, and positions it in relation to reliability, availability, integrity and the false alarm rate. It proposes a methodology for determining continuity losses of the GPS system due to unexpected space segment failures. It applies the methodology to the case of a navigator using the GPS system during a non-precision approach with a 21- or 24-satellite constellation, possibly supplemented by a geostationary satellite. The paper discusses the initial findings, compares them with the continuity requirements currently being drafted by the civil aviation standards organizations, and deduces the availability which navigators can expect of GPS. It distinguishes between use of GPS as a supplemental means navigation system and use of GPS as a sole means navigation system. It discusses the influence of the SATZAP and GPS Integrity Channel (GIC)concepts.
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:	971 - 980
Cite this article:	Durand, Jean Marie, Carlier, Thierry Marcel, "GPS Continuity: Initial Findings," Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991), Albuquerque, NM, September 1991, pp. 971-980.
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