Monday 22 August 2005

G4

PM0023
Analysis of DORIS stations coordinates long time series with CATREF software
Valette, Jean-Jacques¹, Altamimi, Zuheir²
1 Collecte Localisation Satellites, France
2 Institut Géographique National ENSG/LAREG, France
Author email: altamimi@ensg.ign.fr
Since the International DORIS Service started operating in 2003, the processing of DORIS data has been enhancing continuously. Four scientific geodetic groups have processed the whole data set since 1993: INASAN (GIPSY software), Geoscience Australia (GEODYN software), IGN/JPL (GIPSY software), LEGOS/CLS (GINS software). They provided monthly and/or weekly series of stations coordinates in Sinex format. NASA/GSFC also provided solutions over 2004. The Czech Geodetic Observatory of Pecny (Bernese software) and the Russian Institute of Applied Astronomy at St-Petersburg are working towards the integration of DORIS observations in two other different softwares. A good enough number of DORIS solutions performed by different approaches and tools is now available to make possible comparative analysis. Each of the long time series from the four above-mentioned AC's have been processed individually with the same strategy by the Terrestrial Reference Frames (TRF) combination CATREF software developed at IGN/LAREG. We focus the analysis on the discrepancies in the TRF parameters and in the station reliability and stability.

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