Evolution to Civil GNSS Taking Advantage of GeoStationary Satellites

A.J. Van Dierendonck, J. Nagle and G.V. Kinal

Abstract:	The idea of incotporating geostationary satellites as part of a satellite navigation constellation is not new. Recently, the use of a navigation repeater on a geosta- tionary host satellite, both to provide augmentation of coverage and relay of integrity data, has become accepted. This concept is termed an overlay for GPS and GLGNASS (or both collectively, GNUS). It may be shown that this geostationary/non-geostationary combination greatly improves availability and continu- ity of service to users. The cost of geostationary aug- mentation is much less than the provision of a suffi- cient number of additional GNSS satellites. This paper extends the analysis. With a world-wide geostationary civil GNSS overlay and its associated integrity monitoring network, the non-gcostationary space segment could then be simplified. We may then turn our attention from the overlay to the underluy consisting of civil navigation satellites. Frrst, such civil satellites can be simpler than GPS or GLONASS spacecmft, which were designed to meet specialized military requirements. In addition, the integrity moni- toring network allows a further reduction in on-board clock stability and data storage requirements. System costs might also be reduced by using the monitoring network to perform all ephemeris determination. Last, ground control network requitements could be mini- mixed to a residual stand-by capabiity at one or two sites, by using control links from the geostationary space segment.
Published in:	Proceedings of the 49th Annual Meeting of The Institute of Navigation (1993) June 21 - 23, 1993 Royal Sonesta Hotel Cambridge, MA
Pages:	231 - 240
Cite this article:	Van Dierendonck, A.J., Nagle, J., Kinal, G.V., "Evolution to Civil GNSS Taking Advantage of GeoStationary Satellites," Proceedings of the 49th Annual Meeting of The Institute of Navigation (1993), Cambridge, MA, June 1993, pp. 231-240.
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