Improving DORIS geocenter time series using an empirical rescaling of solar radiation pressure models |
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| Authors: | ML Gobinddass P Willis O de Viron A Sibthorpe NP Zelensky JC Ries R Ferland Y Bar-Sever M Diament FG Lemoine |
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| Institution: | 1. Institut Géographique National, LAREG, 6-8, Avenue B. Pascal, 77455 Marne-la-Vallée, France;2. Institut de Physique du Globe de Paris, Géophysique Spatiale et Planétaire, 5, rue Thomas Mann, UFR Step, Bat. Lamarck, Case 7011, 75205 Paris, France;3. Institut Géographique National, Direction Technique, 2, Avenue Pasteur, 94160 Saint-Mandé, France;4. Université Paris-Diderot, Paris 7, 5, rue Thomas Mann, UFR Step, Bat. Lamarck, Case 7011, 75205 Paris, France;5. Jet Propulsion Laboratory, California Institute of Technology, MS 238-600, 4800 Oak Grove Dr., Pasadena, CA 91109, USA;6. SGT Inc., 7701 Greenbelt Rd, Greenbelt, MD 20770, USA;g Center for Space Research, The University of Texas at Austin, MC 1000, Austin, TX 78712, USA;h NRCan, Geomatic Canada, 615 Booth St., Ottawa, Ont., K1A OE9 Canada;i Planetary Geodynamics Laboratory, Code 698, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA |
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| Abstract: | Even if Satellite Laser Ranging (SLR) remains the fundamental technique for geocenter monitoring, DORIS can also determine this geophysical parameter. Gobinddass et al. (2009) found that part of the systematic errors at 118 days and 1 year can be significantly reduced by rescaling the current solar radiation pressure models using satellite-dependent empirical models. Here we extend this study to all DORIS satellites and propose a complete set of empirical solar radiation parameter coefficients. A specific problem related to SPOT-5 solar panel realignment is also detected and explained. New DORIS geocenter solutions now show a much better agreement in amplitude with independent SLR solutions and with recent geophysical models. Finally, the impact of this refined DORIS data strategy is discussed in terms of Z-geocenter monitoring as well as for other geodetic products (altitude of high latitude station such as Thule in Greenland) and Precise Orbit Determination. After reprocessing the full 1993.0-2008.0 DORIS data set, we confirm that the proposed strategy allows a significant reduction of systematic errors at periods of 118 days and 1 year (up to 20 mm), especially for the most recent data after 2002.5, when more DORIS satellites are available for geodetic purposes. |
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| Keywords: | DORIS Geocenter variations Systematic errors Solar radiation pressure |
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