ITRF2008框架下VLBI与GPS确定地心坐标的精度分析

为了解ITRF2008框架下VLBI和GPS两种空间技术确定地心坐标的真正实现精度,在并置站上对VLBI和GPS两种空间技术测定的地心坐标进行了比较,经过偏心改正和七参数转换之后,得到两种空间技术地心坐标不符值的加权中误差,其可以认为是这两种空间技术的真正实现精度,经比较分析这两种地心坐标三个坐标轴方向分量的外符精度都在10mm之内,说明VLBI和GPS确定的地心坐标精度已达到毫米级。

Accuracy of Geocentric Coordinates Determined by VLBI And GPS Under ITRF2008

In order to evaluate the real accuracy of the geocentric coordinates determined by VLBI and GPS under ITRF2008, two kinds of geocentric coordinates are compared located on the same site. The differences between two kinds of geocentric coordinates can be obtained by eccentricity correction and transforming them into the same system. The mean square errors of differences between them can be regarded as the real accuracy of realization. The real accuracy of VLBI and GPS geocentric coordinates is within 10 ram. This shows that the accuracy of determined by VLBI and GPS is better than 1cm.