ITRF参考框架与CGCS2000坐标转换方法及分析

Coordinate Transformation Method and Analysis between ITRF Reference Frame and CGCS2000

参考框架作为参考系统的具体实现,是某一历元坐标和速度的体现。对于高精度的GNSS测量,必须使用精密星历进行解算,而不同的精密星历产品是基于某参考历元t和特定参考框架的,因而最终数据解算结果也是某ITRF框架、历元t的三维坐标;IERS目前公布了多个ITRF框架,2000国家大地坐标系是基于ITRF97框架、历元2000.0。要将GNSS数据解算成果转化至CGCS2000坐标系下,需要考虑框架和历元转换的综合影响;本文探讨了ITRF参考框架与CGCS2000坐标转换方法,并给出具体的应用案例,可为实际应用提供参考。

As the concrete realization of the reference system,the reference frame is the embodiment of a certain epoch coordinate and speed.For high-precision GNSS measurement,precise ephemeris must be used for calculation,and different precise ephemeris products are based on a reference epoch T and a specific reference frame,so the final data solution result is also the three-dimensional coordinates of an ITRF frame and epoch T.IERS has published several ITRF frames,and CGCS2000 is based on ITRF97 frame and epoch 2000.0.In order to convert the GNSS data solution results to CGCS2000 coordinate system,it is necessary to consider the comprehensive influence of the frame and epoch conversion.This paper discusses the ITRF reference frame and CGCS2000 coordinate transformation method,and gives specific application cases to provide reference for practical application.