Improving DORIS geocenter time series using an empirical rescaling of solar radiation pressure models

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...

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Bibliographic Details
Published in:Advances in space research 2009-12, Vol.44 (11), p.1279-1287
Main Authors: Gobinddass, M.L., Willis, P., de Viron, O., Sibthorpe, A., Zelensky, N.P., Ries, J.C., Ferland, R., Bar-Sever, Y., Diament, M., Lemoine, F.G.
Format: Article
Language:English
Subjects:
Astronomy
DORIS
Earth, ocean, space
Empirical analysis
Exact sciences and technology
External geophysics
Geocenter variations
Geophysics
Mathematical models
Rescaling
Satellites
Solar radiation
Solar radiation pressure
Strategy
Systematic errors
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Summary: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.
ISSN:0273-1177
1879-1948
DOI:10.1016/j.asr.2009.08.004