DORIS satellite phase center determination and consequences on the derived scale of the Terrestrial Reference Frame

We analyzed one year of DORIS data to estimate daily corrections to the mean locations of the satellite antenna phase centers. For each DORIS satellite, we looked for possible biases, discontinuities, trends or annual signals. All SPOT satellites show very similar patterns, which are characterized by a significant constant bias of about 20 mm in the cross-track direction as well as a clear annual signal of 5 mm amplitude. All DORIS satellites show a consistent systematic radial offset of 10 to 20 mm (equivalent to 1.5 to 3.0 ppb in the Terrestrial Reference Frame) when using ITRF2000. However, this bias mostly disappears with the adoption of ITRF2005P. A discontinuity appears in DORIS radial antenna phase center offset of the ENVISAT satellite on October 12, 2004, at the time of a flight software switch. GPS phase center offsets were also computed for Jason and TOPEX/Poseidon and compared to the corresponding DORIS estimates. Significant differences were found between DORIS and GPS estimations. Finally, we applied these estimated DORIS satellite antenna phase center offsets to derive weekly time series of station coordinates in 2004. Results showed very small improvement for station coordinates and confirmed that DORIS scale could match ITRF2000 scale by modifying the vector between the center of mass of the satellite and the phase center of the on-board antenna with a constant radial offset. We do not recommend the adoption of any empirical DORIS satellite phase center offsets at this point DORIS satellite phase center determination and consequences on the derived scale of the Terrestrial Reference Frame P. Willis, B.J. Haines, D. Kuang Institut Geographique National, Direction Technique, 2 avenue Pasteur, BP 68, 94160 Saint-Mande, France Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr, MS 238-600, Pasadena CA 91109, USA