Fixed Ambiguity Precise Point Positioning (PPP) Using Tropospheric Corrections Based on Numeric Weather Modeling (NWM)

A. Jokinen, S. Feng, W. Schuster, W. Ochieng, L. Yang, C. Hide, T. Moore, C. Hill

Abstract:	This paper analyses the impact of using Numerical Weather Modeling (NWM) based tropospheric corrections on float and fixed ambiguity Precise Point Positioning (PPP). Positioning performance when tropospheric delay is mitigated using the NWM based corrections is compared to the conventional method, where the delay is modeled locally using the University of New Brunswick’s UNB3m tropospheric zenith model, the Global Mapping Function (GMF) and Chen’s tropospheric gradient mapping function. The method was tested using datasets captured at three IGS and OS stations in the United Kingdom. From the results, using NWM based tropospheric corrections can reduce float position solution convergence time, improve the positioning accuracy at the initial ambiguity resolution epoch and decrease the probability of incorrect ambiguity resolution. In terms of the time required to obtain an initial ambiguity resolution, there is no difference between the methods.
Published in:	Proceedings of the ION 2013 Pacific PNT Meeting April 23 - 25, 2013 Marriott Waikiki Beach Resort & Spa Honolulu, Hawaii
Pages:	319 - 329
Cite this article:	Jokinen, A., Feng, S., Schuster, W., Ochieng, W., Yang, L., Hide, C., Moore, T., Hill, C., "Fixed Ambiguity Precise Point Positioning (PPP) Using Tropospheric Corrections Based on Numeric Weather Modeling (NWM)," Proceedings of the ION 2013 Pacific PNT Meeting, Honolulu, Hawaii, April 2013, pp. 319-329.
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