BDS/GPS组合天顶对流层延迟估计的精度分析

Analysis on performance of estimating zenith tropospheric delays for combined BDS/GPS

为了详细分析BDS/GPS组合ZTD的精度,选取8个MGEX跟踪站2014年6月至9月的观测数据,利用精密单点定位法分别在未固定跟踪站坐标和固定跟踪站坐标的情况下估计BDS ZTD、GPS ZTD和BDS/GPS组合ZTD,并与IGS提供的对流层产品进行对比分析。实验结果表明:BDS ZTD现阶段的标准差优于34mm,GPS ZTD与BDS/GPS组合现阶段的标准差相当,均优于14mm;与未固定跟踪站情形下估计的BDS ZTD相比,固定跟踪站坐标的方式虽然可以提高利用BDS估计ZTD的稳定性,但不能提高精度。

In order to further analyze the accuracy of BDS/GPS ZTD,the paper selected the data of 8 MGEX stations during the period of June to September 2014,used PPP to estimate BDS ZTD,GPS ZTD and BDS/GPS ZTD under the conditions of fixed and unfixed station coordinates respectively,and analytically compared with the tropospheric products of IGS.Experimental result showed that currently the standard deviation of BDS ZTD could be better than 34 mm,and that of GPS ZTD would be similar with combined BDS/GPS on 14 mm or better;moreover,compared with BDS ZTD under the unfixed MEGX station,the way of fixed station could improve the estimation stability of BDS ZTD,but not the accuracy.