北京市CORS站坐标时间序列噪声分析

针对北京市CORS站的稳定性问题,该文利用GAMIT/GLOBK软件对北京市13个CORS站2016—2018年的观测数据进行了处理,获取了原始坐标时间序列和坐标残差时间序列,通过极大似然估计的方法对CORS基准站进行了噪声模型分析和区域速度场估计。结果表明,北京市CORS站坐标时间序列的最佳噪声模型为WN+FN+RWN组合模型;采用NEU方向的最佳噪声组合模型对北京市CORS站进行区域速度场估计,BJTZ、CHAO、DSQI、XNJC站的沉降较为严重,其他CORS站N方向速度估值在7.2~14.3 mm/a,E方向速度估值在27.5~32.5 mm/a,U方向速度估值在2.0~8.5 mm/a。

Noise analysis of coordinate time series of Beijing CORS base station

Aiming at the problem of stability of the CORS station in Beijing,using GAMIT/GLOBK software to process the observation data of 13 CORS reference stations in Beijing from 2016 to 2018,the original coordinate time series and coordinate residual time series were obtained,and noise model analysis and regional velocity field estimation of CORS reference stations were carried out by the method of maximum likelihood estimation.The results showed that the optimal noise model of the coordinate time series of Beijing CORS reference station was WN+FN+RWN combined model;the optimal noise combination model in NEU directions were used to estimate the regional velocity field of Beijing CORS station,and the settlement of BJTZ,CHAO,DSQI,XNJC stations were more serious.The speed of north direction of other CORS stations was estimated to be between 7.2 and 14.3 mm/a,the speed of east direction was estimated to be between 27.5 and 32.5 mm/a,and the speed of vertical direction was estimated to be between 2.0 to 8.5 mm/a.