Absolute site velocity estimation using the GPS precise point positioning technique

Jhih Jia Chen, Ming Yang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publication32nd Asian Conference on Remote Sensing 2011, ACRS 2011
Pages1443-1448
Number of pages6
Publication statusPublished - 2011 Dec 1
Event32nd Asian Conference on Remote Sensing 2011, ACRS 2011 - Tapei, Taiwan
Duration: 2011 Oct 32011 Oct 7

Publication series

Name32nd Asian Conference on Remote Sensing 2011, ACRS 2011
Volume2

Other

Other32nd Asian Conference on Remote Sensing 2011, ACRS 2011
CountryTaiwan
CityTapei
Period11-10-0311-10-07

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications

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  • Cite this

    Chen, J. J., & Yang, M. (2011). Absolute site velocity estimation using the GPS precise point positioning technique. In 32nd Asian Conference on Remote Sensing 2011, ACRS 2011 (pp. 1443-1448). (32nd Asian Conference on Remote Sensing 2011, ACRS 2011; Vol. 2).