基于1∶25万地形的两通与三通差分干涉处理对比分析
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摘要
:以 1997年 11月 8日发生 Ms7.6级地震的我国西藏玛尼地区为例 ,利用覆盖该区的两景震前 Tandem ERS SAR影像和一景震后的 ERS SAR影像及我国 1∶ 2 5万地形数据 ,分别进行三通和两通模式下的干涉处理。经对比分析两种处理结果得知 :两种模式下的同震形变场在条纹的整体分布上是一致的 ,在断层附近吻合较好 ,随着距断层的垂直距离拉大 ,残余地形对干涉条纹的形成起了主要作用 ,两种条纹间的差异也逐渐增大。结果说明 :基于当前 ERS卫星分辨率和没有特殊要求的情况下 ,我国的 1∶ 2 5万地形数据可以用作两通差分干涉模式下的外部 DEM数据 ,所得结果在整体上与三通干涉结果基本一致
Taking Mayi district,Tibet,where a Ms7.6 earthquake occurred on Nov.8,1997,as an example,this paper uses two scenes Tandem ERS SAR images obtained before and after the earthquake,and also 1∶250,000 DEM,to perform 3 pass and 2 pass interferometry.From the results of two processing models,one can see that the fringes of co seismic deformation look similar in general distribution,and also near the generation fault,the fringes are most coherent.But with the distance from the generation fault elongates,the difference between them increases,as residual topography becomes the main factor of fringe's generation.The conclusion:based on the current resolution of ERS and without special demand,the existed 1∶250,000 DEM can be used as external DEM for 2 pass interferometry,whose results are similar as 3 pass one in general.
Taking Mayi district,Tibet,where a Ms7.6 earthquake occurred on Nov.8,1997,as an example,this paper uses two scenes Tandem ERS SAR images obtained before and after the earthquake,and also 1∶250,000 DEM,to perform 3 pass and 2 pass interferometry.From the results of two processing models,one can see that the fringes of co seismic deformation look similar in general distribution,and also near the generation fault,the fringes are most coherent.But with the distance from the generation fault elongates,the difference between them increases,as residual topography becomes the main factor of fringe's generation.The conclusion:based on the current resolution of ERS and without special demand,the existed 1∶250,000 DEM can be used as external DEM for 2 pass interferometry,whose results are similar as 3 pass one in general.
引文
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2 郭华东,等.雷达对地观测理论与应用[M].北京:科学出版社,2000.
3 单新建.干涉合成孔径雷达测量技术及其应用[D].[学位论文]中国地震局地质研究所,2001.
4 单新建,宋晓宇,柳稼航,王长林.星载INSAR技术在不同地形地貌区域的DEM提取及其应用评价[J].科学通报,2001,46(24):2074～20795.
5 单新建,马瑾,王长林,柳稼航.利用星载D-INSAR技术获取的地表形变场提取玛尼地震震源断层参数[J].中国科学,2002,32(8).
6 刘永垣,等.雷达成像技术[M].哈尔滨工业大学出版社,1999.
7 PaulA Rosen,ScottHensley,InaR Jouchin,FukK L I.SyntheticApertureRadarInterferometry[J].Proceedings of theIEEE,Vol.88,No.3,March2000.
8 刘国祥,丁晓利,陈永奇,李志林,等.使用卫星雷达差分干涉技术测量香港赤腊角机场的沉降场[J].科学通报,2001,46(14).
9 GrahamL C.SyntheticInterferometryRadar forTopographicMapping[J].Pro.IEEE,1974,62:763～768
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