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Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3813304w&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 13, CiteID L13304
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1
Geodesy And Gravity: Global Change From Geodesy (1222, 1622, 1630, 1641, 1645, 4556), Geodesy And Gravity: Reference Systems, Geodesy And Gravity: Satellite Geodesy: Results (6929, 7215, 7230, 7240), Geodesy And Gravity: Satellite Geodesy: Technical Issues (6994, 7969), Geodesy And Gravity: Integrations Of Techniques
Scientific paper
The International Terrestrial Reference Frame (ITRF) is a fundamental datum for high-precision orbit tracking, navigation, and global change monitoring. Accurately realizing and maintaining ITRF origin at the mean Earth system center of mass (CM) is critical to surface and spacecraft based geodetic measurements including those of sea level rise and its sources. Although ITRF combines data from satellite laser ranging (SLR), Very Long Baseline Interferometry (VLBI), Global Positioning System (GPS), and Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS), its origin is currently realized by the single technique of SLR. Consequently, it is difficult to independently evaluate the origin accuracy. Also, whether the solid Earth is expanding or shrinking has attracted persistent attention. The expansion rate, if any, has not been accurately determined before, due to insufficient data coverage on the Earth's surface and the presence of other geophysical processes. Here, we use multiple precise geodetic data sets and a simultaneous global estimation platform to determine that the ITRF2008 origin is consistent with the mean CM at the level of 0.5 mm yr-1, and the mean radius of the Earth is not changing to within 1σ measurement uncertainty of 0.2 mm yr-1.
Altamimi Zuheir
Collilieux Xavier
Fukumori Ichiro
Gross Richard S.
Vermeersen Bert L. A.
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