参考DEM误差与地表形变对雷达差分干涉相位贡献的灵敏度研究
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摘要
从D-InSAR的基本原理出发,分析讨论了地形相位分量和地表形变相位分量对差分干涉相位的影响,导出了参考DEM误差和地表形变量对差分干涉相位贡献灵敏度的计算公式,得出雷达差分干涉测量中地表形变对相位贡献灵敏度要远远高于参考DEM误差对相位贡献灵敏度的结论。利用DORIS软件,对2003-12-26发生在伊朗东南部的Bam 6.6级地震区,借助高程精度约为30 m的GTOPO30 DEM和高程精度约为10 m的SRTM3 DEM分别进行"二轨"法差分干涉处理,带入同一幅干涉图10194-09693(时间间隔35 d、垂直基线为519 m的ENVISAT-ASAR影像对)中,得到了相似的6个干涉条纹,只是采用GTOPO30 DEM产生的干涉条纹有更多噪声的影响,验证了该结论的正确性。
The influence of terrain phase component and ground deformation phase component on different interferogram phase is analyzed based on D-InSAR basic principles.The sensitivity calculation formula of ground deformation and reference DEM to InSAR phase is educed.The conclusion is that the sensitivity ratio of InSAR phase to ground deformation is higher than reference DEM.M6.6 earthquake happened at Bam City in the southeast of Iran on 2003-12-26.The damage area is used to test the conclusion by using open DORIS software.GTOPO30 DEM with elevation precision of 30 m and SRTM3 DEM of 10 m are adopted to deal with biorbit differential interferogram respectively,which are put into the same interferogram 10194-09693(ENVISAT-ASAR image pairs with 519 m vertical baseline and interval of 35 days).6 similar interference fringes obtained prove the conclusion though the interference fringes produced by GTOPO30 DEM are slightly influenced by noise.
The influence of terrain phase component and ground deformation phase component on different interferogram phase is analyzed based on D-InSAR basic principles.The sensitivity calculation formula of ground deformation and reference DEM to InSAR phase is educed.The conclusion is that the sensitivity ratio of InSAR phase to ground deformation is higher than reference DEM.M6.6 earthquake happened at Bam City in the southeast of Iran on 2003-12-26.The damage area is used to test the conclusion by using open DORIS software.GTOPO30 DEM with elevation precision of 30 m and SRTM3 DEM of 10 m are adopted to deal with biorbit differential interferogram respectively,which are put into the same interferogram 10194-09693(ENVISAT-ASAR image pairs with 519 m vertical baseline and interval of 35 days).6 similar interference fringes obtained prove the conclusion though the interference fringes produced by GTOPO30 DEM are slightly influenced by noise.
引文
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[12]Li Tao,Liu Jingnan,Liao Mingsheng,et al.EnvisatASAR orbit error analysis and case study[J].Proceedingsof SPIE-The International Society for Optical Engineering,2006,6419:641928.
[2]廖明生,林珲.雷达干涉测量———原理与信号处理基础[M].北京:测绘出版社,2003:1-164.
[3]Wang Chao,Zhang Hong,Liu Zhi,et al.Satellite SAR in-terferometric observations of displacement associated with ur-ban subsidence in Suzhou,Eastern China[J].Progress inNatural Science,2002,12(10):798-801.
[4]Liu Guoxiang,Ding Xiaoli,Chen Yongqi,et al.Groundsettlement of Chek Lap Kok Airport Hong Kong,detected bysatellite synthetic aperture radar interferometry[J].ChineseScience Bulletin,2001,46(21):1778-1782.
[5]Lu Zhong,Zhang Jixian,Zhang Yonghong.Interferometricsynthetic aperture radar(InSAR)and its applications to studyvolcanoes(part1:Principles of InSAR)[J].Science of Survey-ing and Mapping,2006,31(1):51-54.
[6]Bamler R,Hartl P.Synthetic aperture radar interferometry[J].Inverse Problems,1998,14:R1-R54.
[7]Rosen P A,Hensley S,Joughin I R,et al.Synthetic aper-ture radar interferometry[J].Proceedings of the IEEE,2000,88(3):333-382.
[8]Lyons S,Sandwell D.Faultcreep along the southern San An-dreas from interferometric synthetic aperture radar,permanentscatterers,and stacking[J].J.Geophys.Res.,2003,108(B1):ETG11 24.
[9]李振洪,刘经南,许才军.InSAR数据处理中的误差分析[J].武汉大学学报:信息科学版,2004,29(1):72-76.
[10]陈俊勇.对SRTM3和GTOPO30地形数据质量的评估[J].武汉大学学报:信息科学版,2005,30(1):941-944.
[11]刘国林,郝晓光,薛怀平,等.影响InSAR测高精度因素的相关性分析[J].武汉大学学报:信息科学版,2007,32(1):55-58.
[12]Li Tao,Liu Jingnan,Liao Mingsheng,et al.EnvisatASAR orbit error analysis and case study[J].Proceedingsof SPIE-The International Society for Optical Engineering,2006,6419:641928.
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