Pseudolite-Based Inverted GPS Concept for Local Area Positioning

Kyle O'Keefe, Jayanti Sharma, M. Elizabeth Cannon, Gérard Lachapelle

Abstract:	The concept of an inverted positioning system using pseudolites is discussed whereby a ‘constellation’ of GPS receivers tracks a mobile pseudolite. The system consists of the mobile pseudolite, a stationary reference pseudolite, and an array of GPS receivers. The configuration of the GPS receiver array, and the location of both pseudolites, is examined in terms of geometry and tracking capability. Static and semi-kinematic tests of the system were conducted in a local area at the University of Calgary in August, 1999. The experimental setup and accompanying data collection procedure are outlined. Challenges of using pseudolites for position determination, including the near/far problem and other receiver issues, are discussed. The C/A code and carrier phase pseudolite data was processed using a between-pseudolite single differencing approach. The accuracy of the pseudolite positions are presented and discussed. Code and carrier phase positions have RMS errors on the order of 1 meter and 10 cm, respectively. Possible error sources including time invariant multipath and ambiguity resolution are considered.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	1523 - 1530
Cite this article:	O'Keefe, Kyle, Sharma, Jayanti, Cannon, M. Elizabeth, Lachapelle, Gérard, "Pseudolite-Based Inverted GPS Concept for Local Area Positioning," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 1523-1530.
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