Assessment of EGNOS continuity from position

X. Derambure, J.M. Piéplu, D. Flament, J.C. Levy, E. Sales

Abstract:	The EGNOS system is being developed in Europe to pro-vide GPS and GLONASS regional augmentation services to aviation, maritime and land users. EGNOS is a major element of the European Satellite Navigation Program, which is jointly being implemented by the Commission of the European Union, the European Space Agency and EUROCONTROL [4]. The EGNOS system, as any other Wide Area Augmenta-tion System, relies on the broadcast of correction and in-tegrity information in the pseudo-range domain, which are then used to provide a solution in the position domain service. The EGNOS System Performance Requirements, and in particular the Continuity of Service, are specified in the position domain. A key process in the allocation and veri-fication of EGNOS system and sub-systems performances is therefore the relationship between the Continuity of Service and the Continuity characteristics of the broadcast corrections and integrity information. This paper describes a theoretical approach on this issue and associated simulation results, as currently achieved in the frame of the EGNOS implementation phase. In par-ticular, it identifies the major sources of non-continuity in the EGNOS service and describes in probabilistic terms the impact of EGNOS integrity bounds instabilities on the User level Continuity of Service.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	171 - 180
Cite this article:	Derambure, X., Piéplu, J.M., Flament, D., Levy, J.C., Sales, E., "Assessment of EGNOS continuity from position," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 171-180.
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