ITRF2005与CGCS2000坐标转换方法与精度分析

TRANSFORMATION METHODS AND ACCURACY ANALYSIS BETWEEN ITRF2005 AND CGCS2000 COORDINATE

提出从框架和历元同时转换、框架和历元分开转换两种不同思路实现ITRF5到CGCS2000的坐标转换。转换结果表明：框架和历元同时转换的方法不能满足转换精度的要求；框架和历元分开转换，先根据若干基准点的位置与速度信息采用加权平均法内插转换点的速度实现历元间的转换，统一历元后再采用七参数法实现框架间的转换，其内符合精度与外符合精度均为1—2cm，能满足转换精度要求。

With the adoption of China Geodetic Coordinate System 2000 （ CGCS2000）, it is becoming vital to transform the present measurement results to CGCS2000. Two different approaches are used to realize the transformation between ITRF2005 and CGCS2000. One is the transformation with considering the epoch and the frame together and the other is with considering the two aspects respectively. The practical results show that the former can not satisfy the accuracy required. As for the later, the motion rate of the points unknown can be interpolated first by using a weight-average method according to the available information of points known, and then adopt the 7 parameters to transform the different frames. This method can meet the needs of transformation accuracy which can achieve 1 -2 cm.