Topex orbit determination and gravity recovery using GPS data from repeat orbits

摘要: A covariance analysis is presented for a differential GPS-based technique satellite tracking and gravity recovery to be demonstrated on Topex in the early 1990's. The employs data from an ensemble of repeat ground tracks recover unique epoch state each track set invariant local parameters common all tracks. For satellites above about 800 km altitude, where modeling dominant systematic error, averaging random error over many arcs adjustment model reduces final position error. can then used produce refined global model. indicates that errors ranging 5 8 cm altitude 0.05 0.2 mgal field achieved, depending number used.