星载InSAR在冻土地表变形中的研究进展

RESEARCH OF SPACEBORNE InSAR IN SURFACE DEFORMATION OF PERMAFROST

多年冻土是青藏高原主要的,也是关键的土壤类型。其发生、发展对青藏高原生态、水文等都有重要的影响。自出现合成孔径雷达干涉技术(Interferometric Synthetic Aperture Radar,In SAR)以来,对多年冻土区土壤冻融的研究就出现了一种新的手段,利用该方法可以有效探测近地表土壤的冻融状态。本文首先介绍了多年来各国的星载合成孔径雷达(SAR),然后阐述了该方法的理论基础,最后对差分干涉合成孔径雷达技术(D-In SAR)、小基线子集方法(Small Baseline Subset Approach,SBAS-DIn SAR)和永久散射体技术(Permanent Scatterers,PS)都做出了描述。综上所述,利用适合的SAR数据和有效的In SAR方法研究青藏高原冻土区的冻融状况,可以为今后的科学研究提供范围广、类型多样、精度高的基础数据。

Permafrost as a significant kind of soil type in Qinghai-Tibet Plateau. The distributions and evolutions of permafrost play an import role on the ecological and hydrological dynamics. The method of Interferometric Synthetic Aperture Radar( In SAR) is a new tool for monitoring the process of permafrost freezing and thawing is used. It could be a effectively proxy to detect surface soil freezing and thawing. In this paper,firstly we introduced the datasets of synthetic aperture radar( SAR)launched by several countries at present; secondly,the theoretical basis of the method was demonstrated; finally,the DIn SAR,small baseline subset approach( SBAS) and permanent scatterers( PS) were presented. In a word,using the appropriate SAR data and effective In SAR method permafrost freezing and thawing researching in Qinghai-Tibet Plateau could provide a diverse data.