Abstract Atmospheric phase screen (APS) is one of the main error sources of interferometric synthetic aperture radar (InSAR) measurements. In order to accurately retrieve displacement fields, it is necessary to use advanced methods to eliminate the tropospheric effect of interferograms. In this paper, the land subsidence in Kurdistan province of Iran is investigated using Sentinel-1A acquisitions on a single track for the period 2014–2018. The accurate and applicable 3D ray tracing technique is used to accurately estimate the APS. The ERA-I reanalysis data generated by European Centre for Medium Range Weather Forecasts (ECMWF) are used to implement the 3D ray tracing technique. In order to determine the effect of using the 3D ray tracing technique, the APSs are also determined using a traditional approach called, spatiotemporal filters method. To evaluate the capability of the two methods, the results are compared with the weather research and forecasting model (WRF) model. Finally, the interferograms are corrected using APSs from 3D ray tracing technique and traditional method and the subsidence rate in the study area is computed. Comparing the subsidence rates obtained from two APS estimation methods with piezometric data, GPS and precise levelling observations shows that the 3D ray tracing technique is significantly more accurate than traditional method in computing InSAR displacement fields.

中文翻译：

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InSAR时间序列分析用于伊朗库尔德斯坦地面沉降评估的大气相位屏幕估计

摘要 大气相位屏（APS）是干涉合成孔径雷达（InSAR）测量的主要误差源之一。为了准确地反演位移场，需要采用先进的方法来消除干涉图的对流层效应。在本文中，使用 Sentinel-1A 在 2014 年至 2018 年期间在单一轨道上的采购调查了伊朗库尔德斯坦省的地面沉降。准确适用的3D射线追踪技术用于准确估计APS。欧洲中期天气预报中心 (ECMWF) 生成的 ERA-I 再分析数据用于实施 3D 射线追踪技术。为了确定使用 3D 光线追踪技术的效果，还使用称为时空滤波器方法的传统方法来确定 APS。为了评估这两种方法的能力，将结果与天气研究和预报模型（WRF）模型进行了比较。最后，利用3D射线追踪技术和传统方法的APS对干涉图进行校正，计算研究区的沉降率。将两种 APS 估计方法获得的沉降率与测压数据、GPS 和精确水平观测进行比较，表明 3D 射线追踪技术在计算 InSAR 位移场方面比传统方法更准确。