DGPS RTK Positioning Using a Reference Network

Gérard Lachapelle, Paulo Alves, Luiz Paulo Fortes, M. Elizabeth Cannon and Bryan Townsend

Abstract:	This paper describes the design, operation and testing of a RTK GPS system based on the use of a multi- reference station approach. The use of a multi- reference station network, as opposed to a single reference station, results in a larger service area coverage, a lower number of reference stations, increased robustness, and a higher positioning accuracy. The effective distance to the nearest reference station required to resolve the carrier phase ambiguities increases by a factor of 1.5 to 3. Carrier phase observable errors in the coverage area are modeled using the differential carrier phase observables between the reference stations. Corrections that are generated in real-time using the reference station network are broadcast to mobile users. Differential errors such as that caused by ionospheric activity can be more effectively modeled. A series of real-time tests conducted using a regional reference network in Japan and a local reference network in Calgary, demonstrate the effectiveness of the approach.
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:	1165 - 1171
Cite this article:	Lachapelle, Gérard, Alves, Paulo, Fortes, Luiz Paulo, Cannon, M. Elizabeth, Townsend, Bryan, "DGPS RTK Positioning Using a Reference Network," 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. 1165-1171.
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