Research On Deformation Monitoring Along Xianshuihe Region Using D-InSAR Technology

Interferometric Synthetic Aperture Radar is a newly developed space to earth satellite observation technology in the early 21st century, it can obtain ground deformation information with large coveraging area, low cost and high precision and it would not be affected by day and night and weather condition. Besides, InSAR technology can monitor deformation information without the need to set monitoring network, and it can cover areas which are hard for personnel to reach. In theory, InSAR technology can reach an accuracy of mm level or even more in ground deformation detection. Therefore, it has became an important way in detecting micro deformation, and in surveying and mapping. The theoretical algorithm of InSAR technology mainly includes D-InSAR(Differential InSAR), PS-InSAR(Permanent Scatterers InSAR) and SBAS-InSAR(Small Baseline Subset InSAR).These three methods have their own advantages and disadvantages, which are suitable under different conditions.Based on the analysis of InSAR, D-InSAR and PS-InSAR technology, this paper extract ground deformation information near Ba Mei area in Xian Shuiehe fault zone through using 20 scenes S AR image observed by ENVIS AT satellite from July the 15th, 2003 to August the 17th,2010. This paper also extract deformation information of Xian Shuihe region from June the 8th,2010 to August the 17th,2010 by using 3 passes D-InSAR method, and compare the results with GPS monitoring data. This paper research on various algorithm in D-InSAR data processing in detail, compare and analysis different filtering methods of Adaptive Window, Boxcar, Goldstein and improved Goldstein based on variance. Among them, an improved Goldstein filtering method is proved to be the best filtering method,which is better than the other 3 ways, through data processing experiment. Further more, the deformation rate of research area from July the 15th,2003 to August the 17th,2010 is studied through PS-InSAR technology and compared with GPS monitoring results, the results prove that the extracted information of PS-InSAR shows high precision and consistency with GPS monitoring data, which proves the feasibility and accuracy of InSAR technology in detecting ground deformation. The active tectonics of Xian Shuihe region is interpreted in the paper based on deformation information extracted through PS-InSAR. Such fruits provide quantitative and reliable deformation information for the toctonic research and the deformation disaster monitoring, and also for the warning and prevention of natural disasters in the region.