EGNOS and Other SBAS System Behaviours Facing Various Conditions

Franck Froment, Dominique Debailleux, Didier Flament, Javier Ventura-Traveset, Cristoforo Montefusco and Eduardo Tapias

Abstract:	Several SBAS systems in more or less advanced development phases exist all around the world. The European area is covered by the EGNOS system. Today, the deployment phase of EGNOS is finished and the system will be fully operational during the second quarter of 2005. During its exploitation phase, EGNOS will have to face various exceptional events like ionospheric disturbances or GPS failures. In this paper, the behaviour of EGNOS under various conditions is presented. Apart from nominal conditions, it is interesting to assess the EGNOS system behaviour during special events like situations of degraded ionospheric conditions. The exceptional event that will be treated is the ionospheric events at the end of October 2003. The relevance of this assessment is that this storm is one of the largest occurred during the last solar cycle, and one of the worst ionospheric storms ever recorded. This paper will show that EGNOS is able to provide a reliable service over the whole service region with reasonable degradations, as well as vertical guidance capability (APV) over most of Europe during this abnormal ionosphere conditions. These are extremely encouraging result that reinforces the confidence on the EGNOS safety design and algorithmic conception.
Published in:	Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005) September 13 - 16, 2005 Long Beach Convention Center Long Beach, CA
Pages:	2359 - 2364
Cite this article:	Froment, Franck, Debailleux, Dominique, Flament, Didier, Ventura-Traveset, Javier, Montefusco, Cristoforo, Tapias, Eduardo, "EGNOS and Other SBAS System Behaviours Facing Various Conditions," Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005), Long Beach, CA, September 2005, pp. 2359-2364.
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