基于整网解和分区解的铁路沿线基准站CGCS2000坐标确定

Determination of CGCS2000 coordinates of reference stations along railway lines based on whole network solution and region solution

基于现有高铁线路控制测量或监测需求,在沿线布设卫星导航定位连续运行基准站(CORS)作为控制基准。对于较长的线路监测,对沿线基准站坐标采用整网解与分区解进行差异比较,并设计了多种比较方式。研究结果表明,对于计算铁路沿线基准站的国际地球参考框架(ITRF)2020坐标,整网处理与分区处理的差异较小;对于CORS站的2000国家大地坐标系(CGCS2000)的坐标计算,两者差异大部分在框架转换精度范围内,但仍有12%的点差异较大,超过了CGCS2000框架转换的2倍误差。在实际计算过程中,需要考虑整网处理与分区处理的差异。

Based on control surveying or monitoring requirements of the existing high-speed railway lines,continuously operating reference stations(CORSs)with satellite navigation were arranged along the railway line as a control datum.For monitoring of long railway lines,the whole network solution and the region solution were used to compare the coordinate difference of the CORSs along the railway line,and various comparison methods were designed.The research results show that there is little difference between the whole network solution and the region solution in calculating the coordinates along the railway line under the International Terrestrial Reference Frame(ITRF)2020.For the coordinate calculation result of CORSs under the China Geodetic Coordinate System 2000(CGCS2000)frame,the difference between them is mostly within the range of frame conversion accuracy,but there are still 12%points with a larger difference,which exceeds twice the conversion error under CGCS2000 frame.In the actual calculation,it is necessary to consider the difference between the whole network solution and the region solution.