The Analysis of the Characterization for GLONASS and GPS on-Board Satellite Clocks

Abstract

With GLONASS and GPS satellite clocks aging and modernizing, their characteristics present corresponding changes and certain differences. For that reason, the paper puts forward a combined method of detecting gross, adopts the quadratic polynomial model to fit the satellite clock error model, calculates the phase, frequency, frequency drift and residual of GLONASS and GPS on-board satellite clocks, chooses Modified Total Variance and Hadamard Total Variance to calculate the stability of cesium (Cs) and rubidium (Rb) clock respectively, and then analyses the characterization of the on-board satellite clocks. From examples, finding out that the combined method of detecting gross is effective; revealing the variation law of the phase, frequency, drift and residual for GLONASS and GPS satellite clocks; discovering that the stability of GPS BLOCK IIF satellite clocks are the best, GPS BLOCK IIR-M&IIR Rb clocks and the newer GLONASS satellite clocks follow, and then there are GPS BLOCK IIA Cs clocks and the older GLONASS satellite clocks, but GPS BLOCK IIA Rb clocks are the worst. Meanwhile, there is a numerical relationship between the stability and residual of the satellite clocks.