中文摘要：

在相同历元下,忽略速度和转换参数变率的影响,实现了坐标协方差阵的严密框架转换。通过这种方法,能够使局部区域数据不必重新处理就能纳入ITRF框架,方便利用国际上已有的数据成果。实例表明,使用该种方法,转换后的坐标偏差优于0.1 mm,完全能够满足框架之间转换的要求。

英文摘要：

The variance-covariance matrices of station coordinates can be rigorously transformed between two reference frames at the same epoch,ignoring the influence of velocities and 7 transform parameters rates.By the method,local area data can be brought into ITRF and avoid data processing repeat simultaneity.Moreover it＇s convenient to use directly international data products existed in the Internet.Analyzing the results of the example,discover that the transformed coordinates deviation can excel 0.1 mm level,which can meet the transformation request between two reference frames.This paper can be used for reference to unite data in different reference frames.