Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet..134c&link_type=abstract
In: Journées 2004 - systèmes de référence spatio-temporels. Fundamental astronomy: new concepts and models for high accuracy obs
Astronomy and Astrophysics
Astronomy
Earth Rotation, Space Geodesy
Scientific paper
In the framework of activities of the International Earth Rotation and Reference Systems Service (IERS) Combination Research Centres (CRC), the french Groupe de Recherche en Géodésie Spatiale (GRGS) studies the benefit of combining four geodetic techniques (SLR, VLBI, GPS and DORIS) at the measurement level in order to obtain a global and consistent solution for Earth Orientation Parameters (EOPs): polar motion xp and yp, universal time UT and celestial pole offsets in longitude and obliquity dψ and dɛ with a six-hour sampling, as well as weekly station positions. A one-year test period (the year 2002) has been chosen to prove the power of such a combination moreover worked out in a homogeneous global terrestrial reference frame. All techniques were processed in the same computational framework (GINS/DYNAMO) so with the same a priori models and a priori values for parameters. The optimal relative weights between each geodetic technique were obtained with an optimal variance component estimation method.
Bério Ph.
Biancale Richard
Coulot David
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