重轨星载InSAR测量中的大气校正方法综述

随着合成孔径雷达干涉测量(Interferometric Synthetic Aperture Radar,InSAR)技术在地形测绘及地表形变监测等领域应用日益广泛,提高其测量精度成为该技术领域近期研究的热点之一。而InSAR测量过程中的大气效应是限制其测量精度提高的主要误差源之一,如何经济有效地消除大气效应引起的延迟位相(即大气校正)是InSAR技术应用中亟待解决的问题。详细介绍了InSAR测量中现有的大气校正方法,并评述了各自的优缺点及适用条件。最后对InSAR大气校正研究中仍就存在的问题进行了概括并提出展望。

Overview of the Atmospheric Correction Methods in Repeat-pass InSAR Measurements

With the fast development of Synthetic Aperture Radar Interferometry(InSAR)technology in the field of topographic mapping and the ground surface deformation monitoring,there is a much higher demand in the improvement of its measurement accuracy.As is well known,atmospheric effect is the main factor to limit the accuracy of the InSAR displacement measurements,therefore,the removal of the atmospheric delay becomes a crucial problem to be solved.In this paper,we describe the existing methods of atmospheric correction in InSAR technology and also pointed out their advantages and disadvantages separately.The existing methods mainly contain the correcting methods with the SAR images only and the correcting methods with the external water vaper sources(e.g.surface meteorological data,MERIS,MODIS,GPS and the atmospheric numerical model).Finally,we also discussed the difficulties and challenges in this field at present and the possible improvement of the atmospheic correting methods in future.