两种地基GPS水汽含量计算方法的对比研究

Research on Two Methods of Calculating Water Vapor Using Ground-Based GPS

首先在PPP模式的理论研究基础上分别用卡尔曼滤波法和两次差法进行天顶对流层延迟估计,利用IGS数据进行实验证实PPP模式下两种方法天顶对流层延迟估计都具有较高精度。同时,利用PPP程序和GAMIT软件进行实验,验证了基于PPP与双差法的解算结果在整体趋势上的一致性。另外还对比了有无远距离测站参与解算时的双差法的解算精度,并与PPP方法进行对比分析,验证了无远距离测站参与解算时的双差法精度较低。

On the basis of PPP theory,zenith tropospheric delay was calculated by using Kalman filtering method and double-difference method respectively.Processing the data provided by IGS proved that the zenith tropospheric delay calculated by PPP mode in this two methods both have high precision.Then,same data were processed by PPP program and GAMIT.The result shows that the PPP and double-differencing have the same trend.Besides,the data without far-away station information were processed in double-differencing method.The comparison with PPP shows that without far-away station the double-differencing method has low precision.