Architecture for a Civil Integrity Network Using Inmarsat

Per Enge, Peter Levin, Rudolph Kalafus, Paul McBurney, Peter Daly, Jim Nagle

Abstract:	The International Maritime Satellite Organization (Inmarsat) may add a “geostationary overlay” to their third generation of satellites (Inmarsat-3). The overlay is a spread spectrum signal which would be very similar to the civilian signals from GPS and Glonass. It could be received by slightly modified GPS and Glonass receivers and would provide an additional pseudorange measurement. Additionally, it would be modulated with data which describes the health of all GPS and Glonass satellites. AB such, the geostationary overlay would augment the GPS and Glonass constellations, and it would provide an independent “integrity channel”. This paper describes the network which supports the generation of the GPS and Glonass integrity data. The network includes: GPS and Glonass integrity monitors; control Bites which form and uplink the integrity broadcast message; and communication links which connect the monitors to the control sites. Specifically, this paper studies the relative merits of international integrity momtoring networks verBus regional monitoring networks, It also considers how the large geographical coverage overlaps which will exist in Inmarsat’s four ocean region operational plan can be taken advantage of in a worldwide integrity monitoring network implementation. Finally, it considers how the monitoring will be performed and the format of the integrity broadcast.
Published in:	Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990) September 19 - 21, 1990 The Broadmoor Hotel Colorado Spring, CO
Pages:	287 - 296
Cite this article:	Enge, Per, Levin, Peter, Kalafus, Rudolph, McBurney, Paul, Daly, Peter, Nagle, Jim, "Architecture for a Civil Integrity Network Using Inmarsat," Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990), Colorado Spring, CO, September 1990, pp. 287-296.
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