一种区域实时对流层内插模型及其在PPP中的应用

利用反距离加权内插法，对基准站解算的天顶对流层延迟（ZTD）建立了区域实时ZTD模型，评估了该模型内插流动站对流层延迟对PPP定位精度和收敛时间的影响。试验表明：与传统ZTD采用参数估计的处理方法对比，二者解算得到的PPP精度在水平方向上效果相当，但在垂直方向上，模型内插对流层解算的定位精度提高约为5 cm，且能显著提高PPP收敛速度。说明应用本方法建立非气象参数的区域天顶对流层延迟模型能有效加快PPP的收敛速度，且提高定位精度。

A Real Time Regional Zenith Troposphere Delay Model and Its Application in PPP

The real time regional zenith troposphere delay model is introduced by using the inverse distance weighted interpolation method.We assess its influence on the accuracy and convergence time of precise point positioning statistically.The result shows that the ZTD estimation and model calculation can achieve the same horizontal accuracy,but the model corrected PPP improves the vertical accuracy by 5 cm.Furthermore,the convergence time can be reduced obviously with model correction.Validation shows that the real time regional zenith tropospheric delay model introduced in this paper can effectively speed up the convergence of PPP and improve the positioning accuracy.