浙江省级CORS在地方应用精度分析

Precision analysis of using Zhejiang provincial GPS CORS

运用省级CORS系统在地方高级控制点上重复测量成果,分析WGS-84坐标的内部符合精度;基于Bursa-Wolf模型和最小二乘法求解七参数,运用该参数在已知点上进行测量,比较坐标差,得出省级CORS在地方应用时平面坐标偏差控制在2cm、高程大于3cm出现概率偏大的结论。

By using provincial GPS CORS,we measure the coordinates of local high order control points and estimate the internal precision of results in WGS-84.Based on the Bursa-Wolf model and the least-squares method,seven parameters of coordinate transformation are obtained and used to convert WGS-84 coordinates to local coordinates at known control points.Through analysis of coordinate discrepancy at those known control points,we conclude that the precision of horizontal coordinates is within 2cm and with 3cm for the vertical by using the provincial GPS CORS.