陆态网络基准网数据处理策略分析

Analysis of the Data Processing Method of CMONOC CORS

从基准网测站分区和整网平差策略方面对基准网数据处理进行了详细分析,并进行了强约束法和相似变换法的比较实验。结果表明,强约束法对框架精度要求较高,约束点精度对结果有直接影响;而相似变换法保留了区域框架的本质,避免了网形结构的扭曲。由于CGCS2000框架是基于现势性较差的ITRF97的,结果不理想,因此数据处理过程中宜采用现势性较好的ITRF2008或ITRF2014站点联合解算。

In this paper, we analyzed the CORS data processing in detail, from the aspects of the CORS partition and adjustment strategy. And then, we compared the strong constraint method and the similarity transformation method. The result shows that the strong constraint method needs high accuracy of frame and stations. However, the similarity transformation method keeps the nature of regional frame without structure distortion. Because of the fact that the CGCS2000 based on ITRF97, the result is not perfect. Thus the up-to-date data of ITRF2008 and ITRF2014 should be used in data processing.