The Galileo Integrity Concept

Veit Oehler, Francesco Luongo, Juan-Pablo Boyero, Roland Stalford, Hans L. Trautenberg, Jörg Hahn, F. Amarillo, M. Crisci, B. Schlarmann and J.F. Flamand

Abstract:	The Galileo system as specified is the most demanding Global Navigation Satellite System in terms of performance requirements on integrity, continuity, and availability. It has been shown by simulations that the performance of classical SBAS integrity concepts could not be sufficient due to Galileo’s required unavailability of integrity of 0.5% (cf. typical systems: 5% unavailability). Therefore, a new concept has been developed based on the classical approaches but with exploiting unused margins. The present paper outlines this Galileo high quality integrity concept and its impact on the overall System Design. After outlining the high-level architectural basics and system performance requirements the system alert mechanism and user integrity risk equations including the necessary assumptions to cope with the demanding Galileo performance requirements are presented. This user integrity concept for the decision to start a critical operation has an impact on the system allocations and the corresponding integrity and continuity allocation trees are presented. According to the presented concept the user integrity algorithm has to provide various functionalities which are outlined after the presentation of the overall concept. Finally the necessary key performance requirements to cope with the Galileo integrity, continuity, and availability specifications are presented, which have been derived by detailed service volume simulations.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	604 - 615
Cite this article:	Oehler, Veit, Luongo, Francesco, Boyero, Juan-Pablo, Stalford, Roland, Trautenberg, Hans L., Hahn, Jörg, Amarillo, F., Crisci, M., Schlarmann, B., Flamand, J.F., "The Galileo Integrity Concept," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 604-615.
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