QOCA和GLOBK软件处理高精度GNSS网结果对比分析

分别利用GLOBK和QOCA软件对陆态网络260个基准站的GNSS观测数据进行处理,获得站点在ITRF2008框架下的坐标和速度。通过比较分析两个软件的解算结果,证明了QOCA软件能更好地处理测站位移的非线性变化,并通过拟合周年、半年项、剔除共模误差等手段提高解算精度。结果表明,相比于GLOBK软件,QOCA软件得到的拟合残差序列的RMS在E、N、U 3个方向上分别减小70%、80%和70%。

Comparison and Analysis of the Results of QOCA and GLOBK Software in High Precision GNSS Network Processing

The coordinates and velocities of 260 CORS of CMONOC in the ITRF2008 are determined with the GAMIT/GLOBK and QOCA software. The comparative results of the two software show that, QOCA can deal with the non-linear change of station’s displacement, and improve the calculation precision by means of fitting the annual and semi-annual term, by eliminating common mode error and so on. Compared to GLOBK software, the RMS of fitting residual series acquired with QOCA decline by a factor of 70%, 80% and 70% in the N, E, U direction, respectively.