Products and Applications for Precise Point Positioning - Moving Towards Real-Time

P. Héroux, Y. Gao, J. Kouba, F. Lahaye, Y. Mireault, P. Collins, K. Macleod, P. Tétreault, K. Chen

Abstract:	The timely availability of global precise GPS satellite orbit and clock products is enabling the development of precise point positioning (PPP) user applications. Based on the processing of un-differenced pseudorange and carrier phase observations from a single GPS receiver, positioning with centimeter to decimeter accuracy can be attained globally. The PPP approach brings great flexibility to GPS field operations, reduces labor and equipment costs, and simplifies operational logistics by eliminating the need for observation differencing and simultaneous tracking at another location. Seamless integration of the survey results into a global reference frame is another advantage over the differential approach. This paper summarizes the availability of some post-mission precise orbit/clock products for public access and the performance of PPP in static and kinematic modes using single and dual frequency observations . Numerical results are presented showing user positioning accuracy in post-mission and in real-time simulations using NRCan’s On-Line PPP Service and P3, a software package developed at the University of Calgary. From the perspective of GPS correction provision, the impact of tracking network coverage and observation types processed on the correction precision is analyzed with a state-space model implementation using wide-area and global tracking networks. Finally, current limitations of GPS correction sources and the PPP approach are summarized and potential areas for further research and development are proposed.
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:	1832 - 1843
Cite this article:	Héroux, P., Gao, Y., Kouba, J., Lahaye, F., Mireault, Y., Collins, P., Macleod, K., Tétreault, P., Chen, K., "Products and Applications for Precise Point Positioning - Moving Towards Real-Time," 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. 1832-1843.
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