A Semi-Dynamic Approach to Precise Orbit Determination with GPS Data of an onboardReceiver and a Regional Tracking Network

Yanming Feng

Abstract:	The first Australian scientific satellite in over thirty years, Fedsat-1, will be launched in 2000. This low earth orbiting satellite will carry an advanced GPS flight receiver to support its engineering needs and scientific objectives. In the latter applications, precise Fedsat-1 orbital information is of particular need. This paper presents a semi-dynamic method for determining LEO position and velocity based on carrier phase measurements of on-board GPS receiver and a regional differential GPS tracking network, which track all satellites in view continuously over a period of 15 to 30 minutes. It consists of an improved kinematic DGPS estimation procedure for 3d position solution and position-change solution and a orbital improvement dynamic estimation procedure for precise velocity determination. Results from a long baseline static test have preliminarily shown the achievable velocity accuracy of 0.1~0.3 mm per second by the proposed kinematic orbit estimation strategy, as well as a stable performance of the kinematic solutions.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	1529 - 1535
Cite this article:	Feng, Yanming, "A Semi-Dynamic Approach to Precise Orbit Determination with GPS Data of an onboardReceiver and a Regional Tracking Network," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 1529-1535.
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