中国VLBI网软件相关处理机测地应用精度分析

摘要

To support international VLBI geodetic data processing, Chinese VLBI Network (CVN) software correlator has been updated for better performance and more features, including geodetic Mk4 data format output and improvement of signal to noise ratios.After updating, the visibility output of the software correlator can be sent to the standard VLBI geodetic postprocessing software to derive observables.To verify the correlation result, we have carried out correlation with both CVN software correlator and the popular DiFX correlator by using the same data set.We have compared the derived multi-band residual delay/rate, total delay/rate, signal to noise ratio, and the solved VLBI site positions.The comparison results demonstrate that the CVN software correlator has achieved the required precision, and therefore it can be used for IVS geodetic data processing.%为支持国际VLBI大地测量数据处理,中国VLBI网(CVN)软件相关处理机完成了功能、性能升级,提高了信噪比,实现了以国际测地通用Mk4格式数据输出结果,可以直接被VLBI通用测地后处理软件用于时延数据解算.本文通过与国外软件相关处理机DiFX的实测数据比对,系统地分析了CVN软件处理机带宽综合残余时延和时延率精度、带宽综合总时延和时延率精度、信噪比和VLBI站坐标解算值.数据显示,CVN软件相关处理机已经达到了测地数据处理的精度要求,可以用于IVS国际联测数据处理.