Precise Position Determination in Space with GPS

Dorota Grejner-Brzezinska, Jay Kwon, Tae-Suk Bae and Chang-Ki Hong

Abstract:	This paper presents a geometric approach to Low Earth Orbiter (LEO) orbit determination (OD) based exclusively on triple differenced GPS carrier phase observable. CHAMP (Challenging Minisatellite Payload; altitude ~ 450 km) mission data are used to present the accuracy, speed and efficiency of the processing algorithms, to discuss the methods of data screening as well as the effects of geometry on the orbit quality, and the final achievable accuracy including the limitations and the benefits of this method. The data screening for cycle slips is a particularly challenging procedure for LEO, which moves very fast in the middle of the ionospheric layer. It will be shown that SNR (signal to noise ratio) combined with the residual screening offers a good approach. The triple difference method, entirely eliminating the ambiguity resolution, which by itself is a complicated and time consuming task for long-range kinematic GPS, renders the algorithms very efficient. This method has already demonstrated 15-30 cm 3D RMS of fit to the dynamic orbit used as a quality check for kinematic approach.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	2066 - 2073
Cite this article:	Grejner-Brzezinska, Dorota, Kwon, Jay, Bae, Tae-Suk, Hong, Chang-Ki, "Precise Position Determination in Space with GPS," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 2066-2073.
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