先验约束参数估计法在CORS站点复测分析中的应用

CORS站点经过长时间的连续运行可能会发生一定的形变，如未及时修正会对CORS系统解算及流动站定位带来一定的影响。针对这一问题，对固定约束与附加先验约束的参数估计方法求取CORS站点坐标的区别进行了对比；分析了CORS站点坐标对系统解算及流动站定位的影响；给出了CORS站点的复测方案，并对苏州CORS站点坐标进行了实例分析。结果表明，利用当前最新历元的基线解固定约束至建网时的控制点，以维持最新的相对位置及原始坐标框架，其中由于地球板块运动导致的CORS站点位移对系统解算几乎无影响。

Application on the retest analysis of CORS stations with prior constrained parametric estimator

The CORS station deformations may happen, because of their long time running. The station deformation will affect the CORS calculating functions and coordinates of the roving station. For overcoming this problem, the fixed method and the prior constrained parametric estimating method are used to compute the coordinates of CORS station, and their differences are compared. Meanwhile, the influences on the system calculating and roving positioning abilities are analyzed. The scheme of CORS station retest is given, and experiments are carried out using the coordinates of Shuzhou CORS Stations. The results show that when fixing the baseline solutions of the epoch up to the minute to the control stations, the relative positions and original coordinate frame should be maintained. It＇ should be pointed out that the moving of CORS stations causing by the earth plate movement have almost no effect.