Gap Bridging in Precise Point Positioning

Andrew Simsky

Abstract:	The vulnerability to interruption of signal tracking is a well-known problem of standard PPP technology based on float ambiguities. In conventional PPP algorithms, any outage of tracking would trigger a complete reset and re-initialization of ionosphere-free phase ambiguities. In other words, for float PPP there is no difference between a “cold start” and a “hot start”. This presents a serious problem for all land applications, where a vehicle or a surveyor would occasionally pass under an obstacle. This paper presents the performance assessment of an effective gap bridging algorithm, which significantly enhances the usability of the PPP technology, especially for land applications. This algorithm is integrated into an industrial float PPP engine and has been tested in real-life applications. It has been proven to provide near-perfect bridging in benign open-sky conditions and to dramatically reduce both convergence time and positional deviations in more challenging environments.
Published in:	Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014) September 8 - 12, 2014 Tampa Convention Center Tampa, Florida
Pages:	1035 - 1045
Cite this article:	Simsky, Andrew, "Gap Bridging in Precise Point Positioning," Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014), Tampa, Florida, September 2014, pp. 1035-1045.
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