基于地形和气象要素的GPS对流层延迟插值估算研究

摘要

为解决InSAR大气校正受SAR影像数量的限制或天气状况影响问题,提出一种新的对流层延迟估算方法——基于地形和气象要素的对流层延迟估算模型,并以北京GPS网为例进行对流层延迟估算模型的构建和对流层延迟估算.结果表明,利用该模型的估算结果与GPS对流层延迟吻合较好,精度基本在mm级,可满足InSAR大气校正的要求.%In order to solve the problem that the InSAR atmospheric correction is limited by the number of SAR image and weather conditions,a new tropospheric delay estimation method is proposed,which is based on the terrain and meteorological elements.The zenith tropospheric delay model is constructed and the zenith tropospheric delay is estimated by taking the GPS network in Beijing as an example.The result shows that the precision of the model is similar to the GPS tropospheric delay,which is amounted to mm,and can meet the requirements of InSAR atmospheric correction.