【摘要】 <正>一、前言差分干涉雷达(SAR)属于干涉SAR的高级处理技术,应用差分干涉SAR可以监测地表的微小形变(波长级),对于研究精密大地测量、地震学、火山监测等都有重要的意义。由差分干涉处理获得的地壳形变为斜距向,为了与GPS及其它资料相比较,还需要将其分解为竖向与水平向两个分量。为此本文研究了断层活动、强震运动、卫星轨道等之间的关系,确定了不同情况下,斜距向形变分解成水平与竖向两个分量的公式。在以上工作的基础上,处理了西藏玛尼1997年Ms7.5强震区地震前后5景ERS-1/2 SAR图像,获得了差分干涉雷达图像,并精确测量了最大水平与竖向位移分量。更多还原

【Abstract】 D-InSAR is a newly developed high technology in measuring crust deformation with high accuracy. InSAR technology has still not been perfect at present. The difficulty of D-InSAR application lies in the lack of fine data and the processing algorithm being too simple. This paper discusses several processing methods of D-InSAR based on experience accumulated by our predecessors, and puts forward a new method, new 4-pass D-InSAR, and its formula. This method promises to resolve problems as how to deal with SAR data pairs whose time intervals are too large and phase noises are too high. Besides, this paper also deduces calculation formula by which range deformation is separated into horizontal and vertical components. Therefore, by applying this method, people can compare deformation results gotten from D-InSAR with those gotten from GPS etc. Finally, this paper processes some SAR data of the strong Mani earthquake area in Tibet, where M_S=7.4 earthquake took place in November 1997, using D-InSAR technique. And some valuable results are obtained such as co-seismic deformation images and maximum horizontal and vertical component values.更多还原