2020年 第6卷 第8期
《工程（英文）》 >> 2020年 第6卷 第8期 doi: 10.1016/j.eng.2020.08.004
中国动态大地坐标框架最优实现的方法与应用
a Chinese Academy of Surveying and Mapping, Beijing 100036, China
b Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
c School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
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摘要
2000国家大地坐标系（CGCS2000）作为正式发布的法定坐标系已运用了多年。在我国，所有基于全球导航卫星系统（GNSS）测站的坐标为了与CGCS2000框架保持一致，都需要进行坐标改正。实现最佳CGCS2000框架需采用不同的策略，而不同的策略会导致不同的结果，有的差异甚至达到几分米。GNSS测站坐标改正常用的两种方法是CGCS2000控制下的拟稳平差和板块运动改正，两种方法计算的结果相差超过10 cm。本文将监督聚类（supervised clustering）统计方法应用于GNSS基准站的选择，同时提出了GNSS测站大网数据处理分组的间距分区（partition spacing）法，并用板块运动改正将当前历元GNSS测站坐标归算至CGCS2000参考历元。结果表明，新的分区方法明显优于传统的地理分区方法。当以不分组的测站坐标为标准时，新分区方法得到的三维坐标分量的精度均优于2 mm。监督聚类法得到的x、y、z方向上的速度均方根（RMS）分别为0.19 mm·a–1、0.45 mm·a–1和0.32 mm·a–1，远小于传统方法的0.92 mm·a–1、0.72 mm·a–1和0.97 mm·a–1。此外，采用奇异谱分析（SSA）对位置非线性运动进行建模和预测。在东、北、高（E、N和U）方向，SSA的建模精度分别优于3 mm、2 mm和5 mm，在水平方向和垂直方向的预测精度分别优于5 mm和1 cm。
关键词
参考框架优化实现 ; 中国板块模型 ; CGCS2000维持 ; 非线性运动建模
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