Reduced Dynamic Orbit Determination Using Differenced Phase in Adjacent Epochs for Spaceborne Dual-frequency GPS
Abstract We study on reduced dynamic orbit determination using differenced phase in adjacent epochs for spaceborne dual-frequency GPS. This method not only overcomes the shortcomings that the epoch-difference kinematic method cannot be used when observation geometry is poor or observations are insufficient, but also avoids solving the ambiguity in the zero-difference reduced dynamic method. As the epoch-difference method is not sensitive to the impact of phase cycle slips, it can lower the difficulty of slip detection in phase observation preprocessing. In the solution strategies, we solve the high-dimensional matrix computation problems by decomposing the long observation arc into a number of short arcs. By gravity recovery and climate experiment (GRACE) satellite orbit determination and compared with GeoForschungsZentrum (GFZ) post science orbit, for epoch-difference reduced dynamic method, the root mean squares (RMSs) of radial, transverse and normal components are 1.92 cm, 3.83 cm and 3.80 cm, and the RMS in three dimensions is 5.76 cm. The solution's accuracy is comparable to the zero-difference reduced dynamic method.