Absolute site velocity estimation using the GPS precise point positioning technique

Jhih Jia Chen, Ming Yang

研究成果: Conference contribution

摘要

Global Positioning System (GPS) have been widely used in various applications that require high-precision positioning results, such as geodetic control networks and site velocity estimation. Traditionally, site velocities have been determined using relative GPS positioning due to its higher accuracy than that of point positioning. However, the obtained velocity results are thus relative in nature. In recent years, the precise point positioning (PPP) technique, which uses International GNSS Services (IGS) products - precise satellite ephemerides and clocks - to directly estimate site positions in the International Terrestrial Reference Frame (ITRF), has become a promising tool for absolute site velocity estimation. Nevertheless, the PPP-derived site positions have been reported to be partially biased as a result of the fact that the above IGS products are based on the loosely constrained IGS analysis centre (AC) solutions. Therefore, it is an interesting issue to examine the accuracy of PPP-derived site velocities. In this research, we computed a set of PPP-derived velocity solutions for 33 evenly distributed IGS global tracking stations from 5/11/2006 to 31/12/2010, and compared them with their respective quantities defined in the ITRF. During the ITRF2005 period (since 5/11/2006), the velocity differences in the east, north, and up directions were -0.23±0.75, -0.35±0.44, 0.83±1.69 mm/yr, respectively; and after Helmert transformation, they were -0.01±0.52, -0.02±0.38, 0.00±1.68 mm/yr respectively. Only the vertical component was notably improved by the transformation. This indicates that the quality of IGS products improves with time, so the biases that existed in the PPP solutions are gradually diminished. It is concluded that under the current ITRF2005, one can reliably use the PPP technique to obtain highly accurate absolute horizontal site velocities, on the level of sub-mm/yr.

原文English
主出版物標題32nd Asian Conference on Remote Sensing 2011, ACRS 2011
頁面1443-1448
頁數6
出版狀態Published - 2011 十二月 1
事件32nd Asian Conference on Remote Sensing 2011, ACRS 2011 - Tapei, Taiwan
持續時間: 2011 十月 32011 十月 7

出版系列

名字32nd Asian Conference on Remote Sensing 2011, ACRS 2011
2

Other

Other32nd Asian Conference on Remote Sensing 2011, ACRS 2011
國家Taiwan
城市Tapei
期間11-10-0311-10-07

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications

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