Improving Ambiguity Convergence in Carrier Phase-Based Precise Point Positioning

Y. Gao and X. Shen

Abstract:	This paper describes the research results in the improvement of a point positioning system based on undifferenced dual frequency code and carrier observations and precise GPS orbit and clock products. Accelerating ambiguity convergence is essential for the system to satisfy real-time positioning and navigation applications. An alternate code-phase ionosphere-free combination is proposed which has a lower noise level than the conventional ionosphere-free combination. A stochastic estimation approach has also been developed to facilitate precise stochastic modeling of the observations. A partial ambiguity search/fixing and decorrelation process has also been developed to improve the ambiguity convergence performance. Numerical analysis has shown an average convergence time of about 5 minutes. Further improvements of the convergence performance are also considered.
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	1532 - 1539
Cite this article:	Gao, Y., Shen, X., "Improving Ambiguity Convergence in Carrier Phase-Based Precise Point Positioning," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 1532-1539.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In