RESEARCH ON NOISE CHARACTERISTICS OF TIME SERIES OF CORS SITES COORDINATES IN SHANXI REGION
山西CORS坐标时间序列噪声特征分析

The data of Shanxi region CORS nearly two years are processed and then Shanxi CORS sites coordinates time series can be abtained subsequently.For the work,the CATS software is used to analyzed the noise characteristics of sites coordinates time series with Maximum Likelihood Estimation(MLE) and following useful conclusions are drawn.Firstly,there are not only white noise but also colored noise in CORS coordinates time series.Secondly,the noise model in the directions N,E,U of CORS coordinates time series is not identical.In the N,E direction,the "WN + FN" noise model is oplimum and the "WN + FN + RWN" noise model in the U direction.Finally,when CORS coordinates time series are used to fit velocity,not only white noise but also colored noise should be considered for more correct relocity valuations.