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One Year of Daily Satellite Orbit and Polar Motion Estimation for Near Real Time Crustal Deformation Monitoring

Published online by Cambridge University Press:  07 August 2017

Yehuda Bock ,
Jie Zhang ,
Peng Fang ,
Joachim Genrich ,
Keith Stark  and
Shimon Wdowinski
Yehuda Bock
Affiliation:
IGPP A-025, Scripps Institution of Oceanography, 9500 Gilman Drive, University of California, San Diego, La Jolla, CA 92093, USA
Jie Zhang
Affiliation:
IGPP A-025, Scripps Institution of Oceanography, 9500 Gilman Drive, University of California, San Diego, La Jolla, CA 92093, USA
Peng Fang
Affiliation:
IGPP A-025, Scripps Institution of Oceanography, 9500 Gilman Drive, University of California, San Diego, La Jolla, CA 92093, USA
Joachim Genrich
Affiliation:
IGPP A-025, Scripps Institution of Oceanography, 9500 Gilman Drive, University of California, San Diego, La Jolla, CA 92093, USA
Keith Stark
Affiliation:
IGPP A-025, Scripps Institution of Oceanography, 9500 Gilman Drive, University of California, San Diego, La Jolla, CA 92093, USA
Shimon Wdowinski
Affiliation:
IGPP A-025, Scripps Institution of Oceanography, 9500 Gilman Drive, University of California, San Diego, La Jolla, CA 92093, USA

Abstract

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The Permanent GPS Geodetic Array (PGGA) in southern California consists of five continuously operating stations established to monitor crustal deformation in near real time. The near real time requirement has been problematic since GPS satellite ephemerides and predicted earth orientation values (IERS Bulletins A and B) have been found to be neither sufficiently timely nor accurate to achieve horizontal position accuracies of several mm on regional scales. Therefore, we have been estimating precise GPS ephemerides and polar motion since August 1991. An examination of overlapping 24-hour satellite arcs indicates worst-case orbital errors of approximately 0.2 meters in the radial components, 1 meter in the cross-track components and 2–3 meters in the along-track components. A comparison with very long baseline interferometry indicates an accuracy of less than 1 mas in our determination of 24-hour values of pole position. These products are sufficiently timely and accurate to achieve several mm long-term horizontal precision in regional scale measurements of crustal deformation in near real time, as has been demonstrated during the 28 June, 1992 Landers and Big Bear earthquakes in southern California. The PGGA stations were able to detect seismically induced, sub-centimeter-level motions with respect to a terrestrial reference frame defined by the global tracking stations.

Type
Impact on Geodynamics
Information
Symposium - International Astronomical Union , Volume 156: Developments in Astrometry and their Impacts on Astrophysics , 1993 , pp. 279 - 284
Copyright
Copyright © Kluwer 

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