轨道和钟差对天顶对流层延迟估计的影响

Influence of WHU and GFZ final products on estimating zenith tropospheric delays of BDS/GPS

为了分析不同分析中心提供的精密轨道和钟差产品对BDS/GPS ZTD估计的影响,采用WHU和GFZ提供的精密轨道和钟差产品,利用PPP法处理8个MEGX跟踪站2014年6至9月的观测数据。实验结果表明:BDS/GPS ZTD估值与IGS ZTD参考值趋势一致,但利用不同产品估计的BDS ZTD存在一定差异;采用同源产品估计的BDS ZTD和GPS ZTD之间存在系统性偏差,且系统性偏差大小与跟踪站位置有关。可以预见,随着BDS的完善,利用PPP完全可以估计出无明显系统误差、精度达到mm级的BDS ZTD。

In order to analyze the performance of estimating BDS/GPS derived ZTD by using final products from WHU and GFZ,the paper used PPP to deal with the observation data from June to September of 2014 collected from 8 MEGX stations.Experimental results showed that the estimates of BDS/GPS ZTDs would have the same tendency with those of ZTD products of IGS,while with difference in BDS ZTDs from different final products,and the difference between BDS ZTD and GPS ZTD using same final product would have systematic bias,which is related to the location of MEGX stations.It could be further known that with the development of BDS,the estimation precision of BDS ZTD using PPP could be better than 1mm without obvious systematic error.