地震形变监测中人工角反射器的应用
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摘要
CR-InSAR技术克服了常规DInSAR技术在时空上失相干的局限性,在微形变监测中得到广泛应用。其中,人工角反射器的合理布设是顺利实现CR-InSAR技术的基础。通过人工角反射器的科学布设,可以实现人工角反射器的雷达散射截面最大化,有利于其在SAR影像上的识别,从而提高形变监测的精度。采用物理光学法对常用的几类人工角反射器的雷达散射截面进行了数值模拟,其结果与理论值取得较好的一致性。雷达散射截面曲线的分析结果可以指导研究人员选择合适的角反射器类型,以及如何在野外架设角反射器(主要包括方位角和入射角)。
Temporal and geometric decorrelation is the most important factors in differential interferometry synthetic aperture radar.In order to overcome this limitation,the CR-InSAR develops and is applied more broadly in micro-deformation monitoring.The well-off implementation of CR-InSAR needs proper layout of artificial corner reflector as base.When radar cross section(RCS) of artificial corner reflector achieves maximum,it is easier to recognize CR from SAR and increase monitoring accuracy.In view of the understanding,the paper is focusing on the simulation method to RCS of common corner reflectors with physical optics(PO),and the result is compared with theoretical value,good agreement is obtained.The results of the analysis RCS can help choose the right type of corner reflector and provide guidance on how to set up CR in the fields(mainly including azimuth and incident angle).
Temporal and geometric decorrelation is the most important factors in differential interferometry synthetic aperture radar.In order to overcome this limitation,the CR-InSAR develops and is applied more broadly in micro-deformation monitoring.The well-off implementation of CR-InSAR needs proper layout of artificial corner reflector as base.When radar cross section(RCS) of artificial corner reflector achieves maximum,it is easier to recognize CR from SAR and increase monitoring accuracy.In view of the understanding,the paper is focusing on the simulation method to RCS of common corner reflectors with physical optics(PO),and the result is compared with theoretical value,good agreement is obtained.The results of the analysis RCS can help choose the right type of corner reflector and provide guidance on how to set up CR in the fields(mainly including azimuth and incident angle).
引文
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[4]Sakurai-Amano T Kobayashi,Fujii S N.Detection of singular corner reflectors in residential and mountainous areas from SAR images[C]//IEEE 1999 International Geoscience and Remote Sensing Symposium.Hamburg,Germany,1999,2:1454-1456.
[5]Ulusik C,Cakir G,Cakir M,et al.Radar cross section(RCS)modeling and simulation:Part I-Definitions,strategies,and canonical examples[J].IEEE Antennas and Propagation Magazine.Feb,2008.50(1):115-126.
[6]孟敏,聂在平.超大电尺寸目标的物理光学高效算法分析[J].电子科技大学学报,2004,33(5):507-510.
[7]Che Jing,Tang Shuo.RCS analysis of hypersonic cruise vehicle[J].Journal of Astronautics,2007,8(1):227-232.
[8]Ling H,Lee S W,ChouR.High-frequency RCS of open cavities with rectangular and circular cross sections[J].IEEE Trans on AP,1989,37(5):648-654.
[9]Crispin J W Jr,Maffett A L.RCS estimation for simple shape[J].Proceedings of The IEEE,1965,53(8):833-848.
[10]akir G,akir M,Sevgi L.Radar cross section(RCS)modeling and simulation:Part II-A novel FDTD-based RCS prediction virtual tool[J].IEEE Antennas and Propagation Magazine,2008,50(2):81-94.
[11]周力行.二面角反射器的RCS预估[J].长沙电力学院学报:自然科学版,1997,12(3):276-279.
[12]刘松华;郭立新.电大目标RCS的高频计算方法[J].微波学报,2010(Supp 1):105-108.
[13]范菊红,王月青.二面角反射器的RCS特性分析[J].舰船电子工程,2006,26(2):148-150.
[14]Richards M A,Trott,K D.A physical optics approximation to the range profile signature of a dihedral corner reflector[J].IEEE Transactions on Electromagnetic Compatibility,1995,37(3):478-481.
[15]Polyca ipou A C,Balannis C A.A new approach to improve RCS patterns of trihedral corner reflectors[J].IEEE,2009,3:2299-2301.
[16]Youssef Nazih N.RCS of complex targets[M].Proceedings of The IEEE,1989,77(5):722-734.
[17]方重华,赵晓楠,刘倩.改进的物理光学法分析远场目标的电磁散射特性[J].微波学报,2008(4):118-121.
[18]时振栋,唐璞,刘宏伟,等.基本散射体RCS的分析和综合[J].应用科学学报,2003,21(4):331-333.
[19]吴先良.三面角反射器多次散射图形电磁计算[J].安徽大学学报:自然科学版,2000,24(3):85-91.
[20]薛洪新,沈卫东,刘选俊,等.强散射体的RCS分析[J].光电技术应用,2008,23(4):14-17.
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