DGPS Integrity Monitor for Marine Seismic Surveys

Erik Vigen

Abstract:	Seismic surveying demands fairly accurate positioning and the seismic industry was one of the first to use GPS commercially in the 1980s. Early on GPS was always used in combination with other systems such as the Navy Navigation Satellite System or conventional radio navigation systems. Although DGPS has been used for several years its integrity has remained a matter of concern. Geco-Prakla has taken a major step towards ensuring the reliability of GPS surface positioning by introducing a unique Integrity Monitor’ as an integral part of its proprietary seismic positioning system TRINAv”. The methodology monitors the integrity of the user’s position rather than the integrity of the signals provided. This has the advantage that the user equipment, receivers and software, become part of “the loop” and malfunction within these elements can be detected. This approach addresses the requirements for thorough scrutiny of every link in the GPS positioning chain to ensure the overall integrity. During operation the Integrity Monitor can be used to continuously verify the positioning, as well as assist during periods when satellite geometry is too weak for sensible outlier detection based on RAIM (Receiver Autonomous Integrity Monitoring) techniques.
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	353 - 357
Cite this article:	Vigen, Erik, "DGPS Integrity Monitor for Marine Seismic Surveys," Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, MO, September 1996, pp. 353-357.
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