CoAuthors

Alexandre Couhert (CNES, France)

Satellite physical models are critical metadata for DORIS data processing. In particular, the exact location of the center of phase of the on-board antenna with regard to the center of mass of the satellite is of key importance. We investigate here a possible discrepancy observed for the recent Chinese HY2A satellite using multiple approaches. In a first step, we will directly estimate an empirical parameter (radial offset for the position of the center of phase) for HY2A using all available DORIS data and compare it to similar values obtained for other satellites. In a second step, we will derive indirect estimations obtained using DORIS geodetic data processing. In particular, we will investigate time evolution of the scale of the terrestrial reference frame and station position derived from a Precise Point Positioning (PPP) technique, when compared to a multi-satellite DORIS coordinates or to a nearby GPS stations. Results show that the current documentation for HY2A may need to be modified, using empirical values derived from similar studies.