The Effect of a Single-Satellite Integrity Failure

Karl L. Kovach and Hana L. Maquet

Abstract:	Several Navstar Global Positioning System (GPS) integrity system concepts have been proposed based, in one form or another, on timely issuance of satellite-specific go/no-go warnings that alert users to an integrity failure of a satellite. Examples of such integrity concepts include a GPS Integrity Channel (GIC) and SATZAP. One problem encountered by these concepts is defining how large a satellite’s pseudorange errors can be before they issue a no-go warning (GIC) or “zap” the satellite (SATZAP). Since the user requirements for integrity warnings are given in terms of not-to-exceed (NTE) horizontal navigation error thresholds, these integrity concepts must have some way to convert the user NTE horizontal navigation error thresholds into appropriate satellite NTE pseudorange error limits. This paper develops the mathematical techniques necessary to relate the NTE horizontal navigation error thresholds to satellite NTE pseudorange error limits. It builds on results of prior work in the field, extending them to cover the generalized case. A particularly useful relationship is derived for the effect of a single-satellite integrity failure on the user’s navigation error (the most likely condition to be encountered).
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:	957 - 970
Cite this article:	Kovach, Karl L., Maquet, Hana L., "The Effect of a Single-Satellite Integrity Failure," Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991), Albuquerque, NM, September 1991, pp. 957-970.
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