基于PALSAR数据的青藏高原冻土形变检测方法研究

A STUDY OF DEFORMATION IN PERMAFROST REGIONS OF QINGHAI-TIBET PLATEAU BASED ON ALOS/PALSAR D-InSAR INTERFEROMETRY

季节性冻胀和融沉导致的地面形变是青藏高原冻土区建设施工与维护的主要问题。对冻融造成的形变进行有效监测是青藏铁路建设与维护的前提。差分干涉测量技术是地表形变监测的重要手段之一,PALSAR(L波段的合成孔径雷达)数据在非城市区域具有较高的相关性,适合青藏高原冻土区的地表形变监测。本文选用4景覆盖研究区域的PALSAR数据,研究利用该数据进行冻土形变检测的方法,并对其检测结果进行了分析。结果表明,该方法与水准测量方法有较好的一致性。

Surface displacement resulting from seasonal freezing bulge and thawing subsidence constitutes a main hazard to engineering construction of permafrost regions, especially to the Qinghai - Tibet railway. One of the main problems that the Qinghai - Tibet railway encounters is the effective detection of the displacement field. The inter- ferometric SAR technique has the capability for measuring ground deformation in a wide range of application. PAL- SAR can keep high coherence in interferometry over non - urban areas, thus very suitable for analyzing deformation over permafrost regions of Qinghai - Tibet Plateau. This paper presents the method of PALSAR interferometry for analyzing ground surface displacement. The proposed technique was implemented by using to detect the deformation over permafrost regions of Qinghai - Tibet Plateau, and the resul the results obtained by a traditional ground leveli PALSAR interferometry to analyze deformation of ng the method. Such an achievement ENVISAT ASAR images ts are in accordance with encourages future utilization of frozen earth in Qinghai -Tibet Plateau