HR: 0800h
AN: G31A-0780    [Abstracts]
TI: Combination of VLBI, GPS, SLR, DORIS and LLR Data at the Measurement Level: EOP and TRF computations
AU: Barlier, F
AF: Observatoire de la C\^{o}te d'Azur, GEMINI/UMR6203-CNRS, Avenue Nicolas Copernic, Grasse, 06130 France
AU: * Berio, P
EM: philippe.berio@obs-azur.fr
AF: Observatoire de la C\^{o}te d'Azur, GEMINI/UMR6203-CNRS, Avenue Nicolas Copernic, Grasse, 06130 France
AU: Coulot, D
AF: Observatoire de la C\^{o}te d'Azur, GEMINI/UMR6203-CNRS, Avenue Nicolas Copernic, Grasse, 06130 France
AU: Coulot, D
AF: IGN, ENSG/LAREG, 6 et 8 Avenue Blaise Pascal, Cit\'e Descartes, Champs-sur-Marne, Marne-la-Vall\'ee, 77455 France
AU: Exertier, P
AF: Observatoire de la C\^{o}te d'Azur, GEMINI/UMR6203-CNRS, Avenue Nicolas Copernic, Grasse, 06130 France
AU: Biancale, R
AF: CNES/Observatoire Midi-Pyr\'en\'ees, DTP/UMR5562-CNRS, 14 Avenue Edouard Belin, Toulouse, 31400 France
AU: Lemoine, J
AF: CNES/Observatoire Midi-Pyr\'en\'ees, DTP/UMR5562-CNRS, 14 Avenue Edouard Belin, Toulouse, 31400 France
AU: Gontier, A
AF: Observatoire de Paris, SYRTE/UMR8630-CNRS, 61 Avenue de l'Observatoire, Paris, 75014 France
AU: Gambis, D
AF: Observatoire de Paris, SYRTE/UMR8630-CNRS, 61 Avenue de l'Observatoire, Paris, 75014 France
AU: Capitaine, N
AF: Observatoire de Paris, SYRTE/UMR8630-CNRS, 61 Avenue de l'Observatoire, Paris, 75014 France
AU: Altamimi, Z
AF: IGN, ENSG/LAREG, 6 et 8 Avenue Blaise Pascal, Cit\'e Descartes, Champs-sur-Marne, Marne-la-Vall\'ee, 77455 France
AU: Loyer, S
AF: Noveltis, Parc Technologique du Canal, 2 Avenue de l'Europe, Ramonville-Saint-Agn, 31520 France
AU: Soudarin, L
AF: CLS, Parc Technologique du Canal, 8 et 10 rue Herm\`es, Ramonville-Saint-Agn, 31526 France
AB: In the framework of activities of the International Earth Rotation and Reference Systems Service (IERS) Combination Research Centres (CRC), the french {\it Groupe de Recherche en G\'eod\'esie Spatiale (GRGS)} studies the benefit of combining several geodetic techniques (SLR, LLR, VLBI, GPS and DORIS) at the measurements level in order to obtain a global and consistent solution for Earth Orientation Parameters (EOPs): polar motion $xp$ and $yp$, universal time $UT1$ and celestial pole offsets in longitude and obliquity $d\psi$ and $d\epsilon$ 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 with the same computational framework so with the same \textit{a priori} models and \textit{a priori} values for parameters. The optimal relative weights between each geodetic technique were obtained with the Helmert's optimal variance component estimation. The aim of this paper is to describe the processing and the precision/resolution level of each individual technique for EOPs and stations positions, to show how we handled with the combination of techniques, and to discuss results for EOPs by comparing them to the individual solutions per technique or to other external solutions.
DE: 1229 Reference systems
DE: 1243 Space geodetic surveys
DE: 1244 Standards and absolute measurements
DE: 1294 Instruments and techniques
DE: 1299 General or miscellaneous
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting