Static Test Results 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 with an accuracy of 100 meters. However in some situations, such as aircraft precision approaches, higher accuracy 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 monitor stations needed to cover the continental U.S. to the same accuracy would exceed 500. Wide Area Differential GPS (WADGPS) is a system that can reduce the number of monitor stations substantially while achieving the same accuracy. WADGPS can reduce the overall cost and the operation cost of the system dramatically and also can increase the system reliability and integrity. The WADGPS system calculates and transmits a vector of error corrections to the users via satellite. This correction vector consists of parameters describing the 3-D ephemeris errors, satellite clock offsets including SA, and optionally ionospheric time delay. Field test results showed a meter 3-D positioning error with zero latency and 3-5m 3- D positioning error with 5-10 seconds of latency using WADGPS which has 6 monitor stations and 1632km minimum baseline from a dual frequency user while stand-alone 3 -D positioning error is 60m. WADGPS algorithms, implementation, and the field test performance using GPS Global Tracking Network data, are described in this paper.
Published in:	Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993) September 22 - 24, 1993 Salt Palace Convention Center Salt Lake City, UT
Pages:	1233 - 1243
Cite this article:	Kee, Changdon, Parkinson, Bradford W., "Static Test Results of Wide Area Differential GPS," Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993), Salt Lake City, UT, September 1993, pp. 1233-1243.
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