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The International DORIS Service: genesis and early achievements |
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| Authors: | G Tavernier H Fagard M Feissel-Vernier K Le Bail F Lemoine C Noll R Noomen J C Ries L Soudarin J J Valette P Willis |
| Institution: | 1. DCT/PO/AL-Bpi 2002, Centre National d’Etudes Spatiales, 18 Avenue Edouard Belin, 31401, Toulouse Cedex 9, France 2. Service de la Géodesie et du Nivellement, Institut Géographique National, 2 Avenue Pasteur, 94165, Saint-Mandé Cedex, France 3. SYRTE, Observatoire de Paris, 61 Avenue de l’Observatoire, 75014, Paris, France 4. LAREG, Institut Géographique National, 6-8 Avenue B. Pascal, Champs sur Marne, 77455, Marne-la-Vallée Cedex 2, France 5. NASA Goddard Space Flight Center (GSFC), Planetary Geodynamics, Code 698, Greenbelt, MD, 20771, USA 11. Crystal Dynamics Data Information System (CDDIS), NASA Goddard Space Flight Center (GSFC), Code 690.5, Greenbelt, MD, 20771, USA 6. Faculty of Aerospace Engineering, Department of Earth Observation and Space Systems, Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, The Netherlands 7. Center for Space Research, Mail Code R1000, The University of Texas at Austin, Austin, TX, 78712, USA 8. Collecte Localisation Satellites, 8-10, rue Hermès, Parc Technologique du Canal, 31520, Ramonville Saint-Agne, France 10. Jet Propulsion Laboratory (JPL), California Institute of Technology, MS 238-600, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA 9. Direction Technique, Institut Géographique National, 2 Avenue Pasteur, BP 68, 94160, Saint-Mandé, France |
| Abstract: | All space-geodetic techniques are now organized as separate services of the International Association of Geodesy (IAG), supporting the first pilot project “Global Geodetic Observing System (GGOS)”. The International DORIS (Détermination d’Orbite et Radiopositionnement Intégrés par Satellite) Service (IDS) was created in mid-2003 to organize a DORIS contribution to this project and to foster a larger international cooperation on this topic. The goal of this paper is to summarize the key steps that were taken to create this structure and to present its current organization and recent results. At present, more than 50 groups from 35 different countries participate in the IDS at various levels, including 43 groups hosting DORIS stations in 32 countries all around the globe. Four Analysis Centres (ACs) provide results, such as estimates of weekly or monthly station coordinates, geocentre variations or Earth polar motion, that will soon be used to generate IDS-combined products for geodesy and geodynamics. As a first test, a preliminary combination was performed for all the 2004 data from these four ACs. Three of them show RMS of weighted station residuals with respect to this combination solution between 1 and 2 cm. The main topic under investigation is a discrepancy in the scale factor of the terrestrial reference frame (TRF) to map the individual solutions into the combination solution, which reaches 6 cm (multiplying the unit-less scale factor by the Earth radius to get convert scale to millimetre in vertical at the Earth’s surface). Finally, foreseen improvements of the DORIS technology are discussed as well as future improvements concerning the service organization itself and the accuracy and reliability of its scientific products. |
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