Algorithms and Implementation of Wide Area Differential GPS

Changdon Kee and Bradford W. Parkinson

Abstract:	The Global Positioning System (GPS) has proven to be an extremely accurate positioning sensor for a wide variety of applications. However, in some situations such as aircraft precision approaches, even higher aa-zracy is required. Conventional Differential GPS (DGPS) usually has accuracies of 2 to 5 meters within 100 kilometers of the stationary calibration receiver, even with the expected levels of induced Selective Availability (SA) errors. If DGPS is implemented on a large scale, the total number of local monitor stations needed to cover the United States Continent under the same accuracy would exceed 500. Wide Area Differential GPS (WADGPS) is a system which can reduce the number of local monitor stations substantially and also meet such an accuracy. The WADGPS system calculates and transmits a vector of error corrections to the users via satellite. This correction vector consists of parameters describing the three dimensional ephemeris errors, and satellite clock offsets including SA. Field test results using 5 monitor stations showed a couple of meters positioning accuracy and have strongly indicated the potential of WADGPS. The implementation and the field test performance of WADGPS using IERS 91 campaign data, are described in this paper. Also different algorithms for WADGPS are discussed.
Published in:	Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992) September 16 - 18, 1992 Albuquerque, NM
Pages:	565 - 572
Cite this article:	Kee, Changdon, Parkinson, Bradford W., "Algorithms and Implementation of Wide Area Differential GPS," Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992), Albuquerque, NM, September 1992, pp. 565-572.
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