并置站局部连接数据质量分析

Data Quality Analysis of Local Tie at Co-location Sites

局部连接是各种空间大地测量技术组合的关键要素。针对当前一些并置站局部连接精度较低,无法满足组合需要的问题,通过各种空间大地测量技术的长期解,对法国国家地理研究所最新公布的并置站局部连接数据进行了质量分析,在此基础上,以赫尔默特变换参数为评价指标,对并置站进行了筛选。结果显示,21%的并置站局部连接残差大于10 mm;从赫尔默特变换参数中发现,并置站局部连接精度较低会导致空间大地测量网发生扭曲,对于网的平移和缩放影响尤其严重;选择出一组高精度的并置站局部连接,其在N、E和U方向上残差的均方根值分别为4.4 mm、4.7 mm和6.4 mm。

The local tie is a key role in the combination of space geodetic techniques. Some local ties accuracy can not meet the needs of the combination, data quality analysis of local ties is analyzed and selected. In this paper, this paper has carried on the quality analysis to the latest published local data of IGN through the long-term solution of various spatial geodetic techniques.The local ties are selected by using helmert transformation parameters as evaluation indexes. The results show that the 21% local tie residual is more than 10 mm. It is found from the Helmert transform parameters that some local ties cause the network of geodetic techniques to distort, especially the net translation and scaling. Finally, the local ties of high precision are selected, the rms values of the residuals in the N, E, and U directions are 4.4 mm, 4.7 mm, and 6.4 mm, respectively.