基于基准站网的区域参考框架维持及精度分析

Maintenance Method of Regional Reference Frame Based on Reference Station and Precision Analysis

区域参考框架是对全球参考框架的加密,对于构建统一的现代化测绘基准体系具有重要意义。本文通过融合全球IGS跟踪站和FJCORS基准站网对区域控制网进行处理分析,获得区域网ITRF2008框架成果和CGCS2000坐标系成果,其中水平方向精度均优于4 mm,高程方向精度均优于2 cm;通过与现有坐标成果进行对比,发现除一个已知明显地基下沉点之外,其余点成果较差均在3√2 cm以内。因此,在区域控制网解算中融合全球和地方基准站可以获得高精度定位成果,是维持区域参考框架的可靠方法。

The regional reference frame is the encryption of the global reference frame,which is of great significance to the construction of a unified modern surveying and mapping datum system.In this article,by processing data of regional network combining with global IGS tracking station and FJCORS base station,we get coordinate results of ITRF2008 framework and CGCS2000 system.The accuracy of horizontal direction is better than 4 mm while the accuracy of elevation is better than 2 cm.By comparing with the existing coordinate results,it is found that except for one known station which has obvious foundation sinking,the differences of station coordinate are within 3√2 cm.Therefore,it is a reliable method to maintain the regional reference frame by combining with data of global and local base stations in calculating regional network data.