坐标系统任意框架和历元转换研究

Research on Arbitrary Frame of Coordinate System and Epoch Transformation

研究国际陆地参考框架(ITRF)坐标转换问题,分析坐标框架的转换模型,构建一种实用的历元转换方法。研究结果表明在相同历元下,不同框架之间的坐标差异较小,不同活动块体下ITRF2008和ITRF2014在2020.00历元时各分量坐标差小于3 mm。受不同区域地壳活动程度影响,相同框架下不同历元之间的坐标差异明显,基于建立的历元转换方法,实际测试精度可达1 cm左右,能够在工程应用中快速获得CGCS2000坐标。

In this paper,we studied the coordinate transformation of the international terrestrial reference frame(ITRF),which involved frame transformation and epoch transformation.The results show that the coordinate difference between different frames is small in the same epoch,and the coordinate difference of each component of ITRF2008 and ITRF2014 is less than 3 mm in 2020.00 epoch in different active blocks.Affected by the degree of crustal activity in different regions,the coordinate difference between different epochs is obvious in the same frame.Based on this epoch conversion method,the actual test accuracy can reach about 1cm,which can quickly obtain CGCS2000 coordinates in engineering applications.