Geocenter location and variations in Earth orientation using global positioning system measurements

Details Geocenter location and variations in Earth orientation using global positioning system measurements Geocenter location and variations in Earth orientation using global positioning system measurements

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.4611m&link_type=abstract

Journal of Geophysical Research, Volume 98, Issue B3, p. 4611-4618

Physics

Geophysics

2

History Of Geophysics: Geodesy, Geodesy And Gravity: Control Surveys, Geodesy And Gravity: Reference Systems, Geodesy And Gravity: Rotational Variations

Scientific paper

We have studied the use of Global Positioning System (GPS) ground and flight tracking data to measure short-period Earth orientation variations and changes in Earth's center of mass location (the geocenter). Ground-based GPS estimates of daily and subdaily changes in Earth orientation presently show centimeter-level precision. Comparisons between GPS-estimated Earth rotation variations (UT1-UTC) and those calculated from ocean tide models suggest that observed subdaily variations in Earth rotation are dominated by oceanic tidal effects. Our prliminary GPS estimates for geocenter location (from a 3-week experiment) agree with an independent satellite laser ranging estimates to 10-15 cm. Covariance analysis predicts that temporal resolution of GPS estimates for Earth orientation and geocenter improves significantly when data collected from low Earth-orbiting satellites as well as from ground sites are combined. The low-Earth GPS tracking data enhance the accuracy and resolution for measuring high-frequency global geodynamical signals over time scales less than 1 day. Low-Earth orbiters such as Topex/Poseidon carrying GPS flight receivers will provide opportunities to demonstrate these enhancments.

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