Detection of GPS Satellite Signal Failures in Satellite Based Augmentation Systems (SBAS)

Alan Schuster Bruce, A.J. Van Dierendonck, Andrew Jakab, Jonathan Wiebe and Bryan Townsend

Abstract:	The failure of SV19 instigated investigation of a methodology to detect similar SV faults. These faults result in the distortion of the GPS C/A code autocorrelation function that then causes differences in code tracking errors in differently designed receivers. Significant work has been carried out within RTCA and ICAO over the last two years, resulting in requirements being placed on the differential GPS ground networks that provide precision approach capability. RTCA and ICAO have also placed restrictions on the airborne user receiver. The ability to detect such faults is known as Signal Quality Monitoring (SQM) or Satellite Failure Detection (SFD). Thomson Racal Avionics and NovAtel have been contracted by ESA, via Alcatel Space Industries, to provide SFD capability for the EGNOS system. This capability requires monitoring multiple receiver correlator values. To minimise the cost of development, off-the-shelf WAAS (US SBAS) receivers with modified software are used. Since these receivers are already used in WAAS and MSAS (Japanese SBAS), upgrades to those systems should later be relatively straightforward. This paper describes the implementation of SFD for EGNOS.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	189 - 198
Cite this article:	Bruce, Alan Schuster, Van Dierendonck, A.J., Jakab, Andrew, Wiebe, Jonathan, Townsend, Bryan, "Detection of GPS Satellite Signal Failures in Satellite Based Augmentation Systems (SBAS)," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 189-198.
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