FDE and Positioning Performance in a Multi-Fault Scenario Using GPS and Galileo

Yongchao Wang

Abstract:	Although the Global Positioning System and the prospective Galileo satellite navigation system hold various merits respectively, the integration of Galileo and GPS would be a strong trend in the future for the safetyof- life and other critical applications. This paper attempts to demonstrate, under a multi-fault scenario, the potential performance benefits of the future hybrid GPS/Galileo system using the concept of Virtual Galileo Constellation (VGC). Based on the GPS RINEX data collected from four sites in China, the performance of positioning with GPS/Galileo is studied. The availabilities of RAIM fault detection (RAIM FD) and RAIM fault detection/exclusion (RAIM FDE) are evaluated in the multi-fault scenario using the hybrid system. The results have demonstrated that detection of two failures should be fairly achievable with the hybrid GNSS system. When the faults number increases to four, the RAIM ability would be significantly reduced. However, even under the worst-case situation where four failed satellites are removed and the satellite geometry holds the worst, GPS/Galileo still can provide good positioning accuracy. This implies that the false alarm is more affordable in the dual constellation case. This could have some impact on GNSS integrity monitoring concepts.
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:	1772 - 1780
Cite this article:	Wang, Yongchao, "FDE and Positioning Performance in a Multi-Fault Scenario Using GPS and Galileo," 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. 1772-1780.
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