Precision orbit determination of Global Positioning System satellites

Precise geodetic measurement can provide an excellent study of plate tectonic motion. The potential of Global Positioning System (GPS) has been shown in determining the precise baseline. The precise GPS satellite orbit is one key to high-accuracy long baseline (;The research concentrates on the analysis of the pseudo-range and phase data collected during the CASA UNO campaign. The fidelity of the applied force and derived observation models has been tested by processing the tracking data from the campaign with the unconstrained (i.e. no a priori state covariance) batch estimation approach. The orbit accuracy has been assessed through the baseline solution and the orbit comparison.;Based on the results from the tracking data experiments, the precise GPS orbit resulted in baseline accuracy of a few parts in 10...