Scenario for a Gradual Build-Up of a Second Generation GNSS

Christophe Texier and Eric Frayssinhes

Abstract:	In view of its Advanced Research in Telecom Systems navigation program, the EWpean Space m awatded Alcatel Espace with a study concerning the mission definition of a second generation GNSS. This study was performed between January 1995 and March 19%. The purpose of this paper is to present a combination of the options defined within this study. The main interest of the presented implementation option lies in its capability to offer a gradual build-up of the system with a relatively low number of satellites. After a brief introduction to the main guidelines used for the design of the system, the paper focus on the methodology followed to build the constellation. Two different scenarios have been successively assessed: l local constellations as a subset of a global system, including either Inclined Geo Synchronous Orbit (IGSO) satellites or a mix of IGSO and GE0 l pure local constellations The selected constellation consists of: l a global (or (( shared ))) space segment of 9 IGSOs l regional augmentations consisting of groups of 3 GEOs, each group allowing the system to be offered in one of the three regions defined as: Europe/Africa, Eastasia & Australasia and North & South America. Therefore a regional system is obtained with 12 satellites, a two-region system with 15 and a worldwide system with 18 satellites. Then an overview of the system is presented together with the payload budget. Finally an analysis of system performance and budgets is presented.
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	1473 - 1481
Cite this article:	Texier, Christophe, Frayssinhes, Eric, "Scenario for a Gradual Build-Up of a Second Generation GNSS," Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, MO, September 1996, pp. 1473-1481.
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