中文摘要：

利用星载重复轨道合成孔径雷达干涉测量InSAR技术获取数字高程模型（DEM）,无法避免大气延迟效应的影响。InSAR大气校正的方法很多,但在DEM获取方面的大气校正研究却非常少见。本文研究星载重轨InSAR生产DEM时利用大气数值模式WRF（Weather Research and Forecasting model）得到的水汽结果进行大气校正的问题,重点讨论大气校正的策略,包括WRF模式设置和大气校正时机的选择,简要介绍了基于WRF运算结果的大气校正方法。利用Terra SAR-X数据进行实验,检验了所提出方法的有效性,证明了在干涉相位解缠前进行大气校正,比在相位解缠后进行的效果更好。将所提出方法应用于多基线、多波段InSAR干涉结果融合中,实验结果表明大气校正能够有效降低误差,对于相干性较高的地区效果更好。

英文摘要：

Atmospheric delay effect is unavoidable and sometimes serious when using spaceborne repeat-pass synthetic aperture radar inter- ferometry（InSAR） to generate Digital Elevation Models （DEMs）. InSAR atmospheric correction methods come in various types. However, they are rarely used in InSAR DEM generation. The method based on atmospheric numerical models offersunique advantages.It can estim- ate atmospheric water vapor field at the SAR data acquisition time, and it is not affected by clouds. Therefore, this work studies the atmo- spheric correction strategy and method during the process of InSAR DEM generation based on the atmospheric numerical model called the Weather Research and Forecasting （WFR） model to improve the accuracy of the generated InSAR DEM. First, atmospheric correction strategies are discussed. These strategies include the proper settings ofWRF Preprocessing System （WPS） to make the temporal and spatial scales of WRF results match those of SAR data, as well as the selection of a proper atmospheric correction timing to improve the accuracy of InSAR DEMs. One of the key issues of InSAR is phase unwrapping, and atmospheric correction removes the residual atmospheric phase from the interferometric phase of SAR data. Thus, there are two possible atmospheric correction timings： be- fore phase unwrapping and after phase unwrapping. Atmospheric correction before phase unwrapping is theoretically helpful for phase un- wrapping because the contribution of the atmosphere is removed. Atmospheric correction after phase unwrapping is commonly used in the field of Differential InSAR （D-lnSAR）, and its efficiency has been validated. The topographic phase in the process of D-InSAR is removed before phase unwrapping, which makes phase unwrapping easier than that in the process of InSAR DEM generation. A method of atmo- spheric correction based on WRF results is then introduced. The direct output results of WRF are not atmospheric water vapor field, which is needed to calculate the residual atmo