A Precision Best Estimated Trajectory Reconstruction for GPS Users

Young Park and Moises Montez

Abstract:	Testing and validation of GPS navigation capability require a Best Estimated Trajectory (BET) that is accurate and affordable for all application users. This paper presents a post- mission trajectory reconstruction approach using a “dynamic” Wide Area Differential GPS (WADGPS) method. This technique uses the GPS tracking data obtained from International GPS Service (IGS) ground stations and precise GPS ephemerides computed by IGS analysis centers to perform post- mission trajectory or orbit determination. The resulting filter models forty-nine state elements and achieves a DGPS level accuracy for users with or without SA access. As a testing and demonstration, the filter processed both Topex/Poseidon satellite GPS data and Space Shuttle GPS Detailed Test Objective (DTO) data collected from the STS 61 mission. The results of the estimated states and the semi-major axis comparison demonstrate the expected DGFS performance in orbit estimation solving for the effect of Selective Availability. This ‘technique is quite useful as a cost-effective approach to post-processing of almost all GPS trajectory/orbit applications.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	1201 - 1209
Cite this article:	Park, Young, Montez, Moises, "A Precision Best Estimated Trajectory Reconstruction for GPS Users," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 1201-1209.
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