Global geodesy using DORIS data on spot 2

Physics

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Geodesy And Gravity: Reference Systems, Geodesy And Gravity: Rotational Variations, Geodesy And Gravity: General Or Miscellaneous

Scientific paper

The DORIS system developed for precise orbitography and precise positioning has been operational since the launch of the SPOT-2 satellite in January 1990. Doppler DORIS data have been currently analyzed since the beginning of the mission for geodetic objective. Absolute positioning results based on a semi-dynamical orbital analysis approach have been derived with the 2 years of DORIS data available. Cartesian coordinates of the global DORIS network (43 beacons) derived on a monthly basis show a month-to-month repeatability of 5-7 cm rms. Comparison between DORIS station coordinates and those determined by VLBI or SLR collocated with DORIS becons indicates an accuracy of 5-7 cm rms in the 3 coordinates. Earth pole positions are determined at 5-day intervals with a standard deviation of 1-2 mas. The comparison of the pole positions estimated from the DORIS data with a homogenous series provided by the International Earth Rotation Service shows differences with an amplitude of a few mas.

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