基于多时相干涉SAR提取地表形变的关键技术探究

基于重复轨道的合成孔径雷达差分干涉测量(D-InSAR,Differential Interferometric SAR)技术自问世以来,就被立即成为研究重点并在许多领域得到应用。但是常规D-InSAR技术易受时间、空间失相干与大气延迟等影响而有时无法得到可靠的形变信息,因此难以在实践中得到常态化应用。永久散射体技术与小基线集技术的出现,有效地克服了上述问题的制约。本文融合了两种技术的优点,介绍了多时相干涉SAR技术的关键处理步骤,并基于多时相干涉SAR技术提取了太原市2005～2009年间的形变信息。

The Research on Key Processing Techniques for Extracting Ground Deformation Based on Multi-temporal InSAR

Since differential synthetic aperture radar interferometry(D-InSAR) based on repeat observation technology came out in 1990s,it has become a hot research topic immediately and been applied in many fields afterwards.However,the conventional D-InSAR technique is vulnerable to be affected by spatial,temporal decorrelations and the atmospheric variations,and sometimes can not obtain reliable deformation,therefore it is difficult to put this technique into operational uses in practice.Permanent scatterer(PS) technology and small baseline subset(SBAS) technology overcome the constraints of above problems effectively.This paper presents the Multi-Temporal InSAR(MT-InSAR) technology and its key processing aspects.The MT-InSAR processing combines the merits of PS and SBAS InSAR techniques.Finally an experiment based on MT-InSAR is conducted to extract the deformation over Taiyuan area from 2005 to 2009.