Analysis of influence of CME on noise model and velocity estimation of IGS base station coordinate sequence

In this paper, the coordinate time series of 50 IGS base stations are taken as the research object. The BIC model estimation criterion is used to estimate and analyze the four combined noise characteristics. The influence of CME on the IGS base station coordinate time series noise model and station velocity is discussed. The results show that CME can lead to the biased estimation of the noise model of the IGS base station coordinate sequence, and affect the accuracy of the station velocity. When the base station velocity parameter is accurately estimated, the CME should be corrected. After the CME correction, the annual motion of the IGS base station has an amplitude. The decrease is more obvious in the elevation direction, indicating that the filtered IGS base station annual motion is relatively stable.