2000国家大地坐标系下三角网平差技术研究

Adjustment of Triangulation Technique in China Geodetic Coordinate System 2000

原国家大地控制网成果是参心坐标系(1980西安坐标系)成果,而2000国家大地坐标系是地心坐标系,参心坐标系下成果需通过各种改正与网平差,才能得到2000国家大地坐标系成果。叙述了2000国家大地坐标系下三角网平差的技术方法、空间网数据处理和地面网数据归算,介绍了平差模型和精度估计的方法,利用实例进行了平差计算,对结果进行了对比分析,并利用实测数据对平差结果进行了验证,取得了良好的效果,为2000国家大地坐标系统的推广应用提供了良好基础。

The old national geodetic control network results belong to reference-ellipsoid centrie Coordinate System （1980 Xi＇an Coordinate System） results, but China Geodetic Coordinate System 2000 （CGCS2000） belongs to a geocentric geodetic coordinate system. In order to obtain results in CGCS2000, results in reference- ellipsoid-centric coordinate system should be added several corrections and joined in network adjustment. This paper describes the adjustment of triangulation technique in CGCS2000, the data processing of space network and the data reduction of ground network, and introduces the adjustment model and the method for accuracy estimation. Using the example, adjustment calculation is carried out, and the results are contrasted and analyzed. The experiment is well-tried, and favourable basis is provided for application of CGCS2000.