Real-Time Precise Point Positioning and Its Potential Applications

K. Chen

Abstract:	Precise Point Positioning (PPP) is capable of providing centimeter static and decimeter kinematic positioning accuracy, using dual-frequency receivers and high precise GPS products. The precise GPS orbit and clock products with latencies of several hours or days, provided by the International GPS Service (IGS), have been widely used for post-mission positioning applications. Recently, several real-time precise GPS data broadcasted over satellites or Internet have been claimed to offer an accuracy of real-time decimeter navigation performance. In this paper, real-time static and kinematic PPP processing results using JPL corrections received over the Internet will be presented and analyzed. The use of ground-based GPS observations to estimate the amount of Precipitable Water Vapor (PWV) in the troposphere has been well investigated. The estimation so far, however, is feasible only in post-mission or near real time processing because of the complexity of the process. Due to importance of high spatial and temporal resolution, all-weather capabilities of the GPS estimated PWV for severe weather forecasting and operational numerical weather prediction, the key issue of ground-based GPS meteorology is how to get high accuracy Zenith Wet Delay (ZWD) estimate, which is nearly proportional to the vertically integrated water vapor overlying the GPS receiver, from GPS observations with a latency as short as possible. In this paper, a method that has a great potential to estimate absolute Zenith Tropospheric Delay (ZTD) in real-time and with an accuracy of sub-centimeter level will be presented. PPP has also increasingly been recognized as a preferred candidate for accurate time transfer. In this paper, the potential of PPP for sub-nanosecond accuracy receiver clock estimation will be investigated.
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:	1844 - 1854
Cite this article:	Chen, K., "Real-Time Precise Point Positioning and Its Potential Applications," 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. 1844-1854.
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