省级CORS网快速自动化解算与基准维护

Automatic data processing for large scale provincial level CORS network and datum maintenance

随着我国各省市级GNSS连续跟踪站(CORS)网建设的完善,大型GPS基准站网的坐标基准的维护将逐步成为常态化工作。然而CORS网解算的计算量会随着站点数量增加呈几何级数增加,对CORS网解算的日常维护工作带来极大的挑战。本文以河北省级CORS网的70个站点21天数据为测试数据,将整个CORS网分解成四个具有若干公共点的子网,采用分网解算整体平差的模式进行大型CORS网的解算。运用GAMIT/GLOBK软件进行解算,将整个解算过程采用Linux脚本语言实现,最终实现整个CORS网的自动化解算和坐标基准常态化维护。实验结果显示:分网解算比整网解算的时间节省大约92%,分网和整网解算的周解结果在水平方向上差值的平均值优于0.2 mm,最大差值为1.1 mm,在垂直方向上平均差值优于0.6 mm,最大相差2.3 mm。可认定分网与整网解算的精度基本一致,本文分网解算整体平差方法可在提高解算效率的同时保证整网的解算精度,在大型CORS网解的快速解算中具备较高的应用价值。

With the improvement of CORS network construction of GNSS continuous tracking stations at provincial and municipal levels in China,the maintenance of coordinate benchmarks for large-scale CORS networks has gradually become a normalized task.In this paper,a 21-day data of 70 stations in Hebei provincial CORS network is taken as the test data,the whole CORS network is divided into four subnets with several common stations.The mode of calculating the overall adjustment by dividing the network is adopted for the calculation of large CORS networks.In addition,with GAMIT/GLOBK as the core of the solution,the whole solving process is realized by Linux scripting language,and finally the whole CORS network is processed automatically and the coordinate datum is maintained normally.The experimental results show that the calculation time of the sub-network solution is about 92%less than that of the whole network solution.The average difference between the weekly solution results of the sub-network and the whole network solution in the horizontal direction is better than 0.2 mm,the maximum difference is 1.1 mm,and the average difference in the vertical direction is better than 0.6 mm,the maximum difference is 2.3 mm.It can be recognized that the accuracy of sub-network solution is basically the same as that of the whole network solution.The overall adjustment and sub-network processing method in this paper can not only improve the processing efficiency but also ensure the accuracy of the whole network,which has high application value in the fast data processing of large CORS networks.