A Hybrid Solution to Reduce the Long Convergence Time in Precise Point Positioning

Mohamed Abdel-salam

Abstract:	Precise Point Positioning (PPP) using un-differenced code and carrier phase observations as well as precise orbit and clock data is a method that has received increased attention in the last few years within the GPS community. However, it needs long time to converge based on the current available IGS precise data. This paper presents the concept and the components of PPP as well as analysis for results obtained from a PPP system developed at the University of Calgary. The analysis includes positioning accuracy obtained using static, kinematic and marine datasets. Also an analysis for the convergence behavior of PPP and the suitability of ambiguity resolution methods to solve this problem with a special emphasis on the role of non-zero initial phase offset is introduced. Based on IGS precise data, long convergence time is needed. One way to reduce this long convergence time is to use precise data at short intervals; however, this data is not available. Therefore, this paper proposed a technique to reduce convergence time supported by numerical results. The technique has been tested with three static datasets. The results and limitations of the technique are presented.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	2555 - 2562
Cite this article:	Abdel-salam, Mohamed, "A Hybrid Solution to Reduce the Long Convergence Time in Precise Point Positioning," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 2555-2562.
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