一种新的SAR像素偏移量估计流程及其在同震形变监测中的应用  

A New Chain for SAR Pixel Offset Estimation and Its Application in Co-seismic Deformation Measurement

作　　者：董晓燕[1] 丁晓利[1,2] 李志伟[1] 王永哲[1] 

机构地区：[1]中南大学信息物理工程学院,长沙市麓山南路932号410083 [2]香港理工大学土地测量与地理资讯学系

出　　处：《武汉大学学报（信息科学版）》2011年第7期789-792,共4页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(40974006;40774003;40901172);国家教育部新世纪优秀人才支持计划资助项目(NCET-08-0570);湖南省高校创新平台开放研究基金资助项目(09K005);湖南省科技厅重大专项基金资助项目(2008FJ1006)

摘　　要：提出了一种无需外部数据的新同震形变偏移量计算流程。以2003年伊朗巴姆里氏6.6级地震为例,利用两景震前无形变数据证明了新方法的精度较传统方法提高了0.224个像素。利用震前震后两景数据计算了方位向同震形变场,与Okada模型模拟得到的方位向同震形变进行了比较。The traditional methods for estimating pixel offsets of two SAR images use the orbit offsets of several points to fit the orbit offsets of the whole image by using the least squares rule,and then removes them from the total offsets.However,the procedures of data processing are quite complicated.What＇s more,without GCPS,this method contained many kinds of error sources which lead to low precision.To overcome these limits,this paper presents a new simple data processing chain for calculating co-seismic offsets which need no GPS data.In order to compare the precision of two methods,we take the Ms6.6 Bam earthquake occurred in 2003 as an example.First,we processed two SAR images acquired before earthquake with the traditional and the new pixel offset methods respectively.The results show an improvement of 0.224 pixels in precision for the new method.Second,we applied the new and the traditional method to process two images acquired before and after the earthquake.The results indicate that the new method has a higher efficiency and precision.

关 键 词：偏移量 轨道偏移量 同震形变偏移量 强度图相关法 巴姆地震 

分 类 号：P237.3[天文地球—摄影测量与遥感] P315.2[天文地球—测绘科学与技术]