European Complement to GPS: RGIC Systems Simulation Software

Didier Flament, Jean-Marie Durand

Abstract:	Numerous approaches to the GPS Integrity and Coverage issues have already been proposed and studied. The most hopeful alternative seems to be the so-called GPS World Overlay (GPS-WO or also named Ranging GPS Integrity Channel: RGIC) that uses several additional geostationary payloads for integrity broadcast and for coverage improvement. The European Complement to GPS: (CE-GPS), proposed by the French space agency CNES, is one of the most advanced RGIC projects. This paper aims at presenting a simulation tool which will be used to analyse and compare the performances of GPS Integrity Monitoring Systems and more particularly those based on the GIC or RGIC concepts. This paper will first describe briefly the simulator structure, its main elements and its general possibilities, which allow, with high flexibility, to focus the analysis on a specific aspect. Then, the different kinds of results achievable locally (at each successive step) or globally (at the end) of the simulation process will be exposed. Some of them, in terms of user positionning errors, false alarm or missed detection rates will be given and compared to illustrate the influence of some typical different hypothesis. Finally, a RGIC system with a new integrity message calculus principle will be presented. It is based on GPS satellites autonomous tracking using the GPS navigation message itself. Some general performances of this system resulting from realistic simulations will be presented.
Published in:	Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992) September 16 - 18, 1992 Albuquerque, NM
Pages:	167 - 176
Cite this article:	Flament, Didier, Durand, Jean-Marie, "European Complement to GPS: RGIC Systems Simulation Software," Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992), Albuquerque, NM, September 1992, pp. 167-176.
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