城市CORS坐标时间序列噪声模型建立与分析

Noise Model Establishment and Analysis of CORS Sites Coordinates Time Series

以GAMIT/GLOBK处理得到高精度常州CZCORS坐标时间序列,用奇异谱分析方法对其进行空间滤波,使用最大似然估计方法对剔除共性误差的坐标时间序列进行噪声特征分析,得出最优白噪声模型为"WH",N、U分量最优有色噪声模型为"WH+FN",E分量最优有色噪声模型为"WH+FN+RWN"。根据最优有色噪声模型估计出的CZCORS站速度场表现为东南方向整体运动的趋势,其整体位移变化值及运动方向与周围IGS站基本一致。

We use the singular spectrum analysis method to spatial filter with GAMIT/GLOBK pro- cessing of high precision CZCORS coordinate time series. To exclude common mode errors of coordi- nate time series, a maximum likelihood estimation method is used for noise characteristic analysis. The optimal white noise model is ＂WH＂, the optimal colored noise model of the N, U components is ＂WH＋FN＂, and the optimal colored noise model of the E component is ＂WH＋FN＋RWN＂. Emplo- ying the optimal colored noise model to estimate the regional CORS sites velocity field, shows a south- east overall movement trend, and the overall displacement value and movement direction is similar to the surrounding IGS stations.