粗糙面与其上方简单目标的复合电磁散射研究

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1、西安电子科技大学硕士学位论文粗糙面与其上方简单目标的复合电磁散射研究姓名：王运华申请学位级别：硕士专业：无线电物理指导教师：郭立新20050101摘要水文SasAfj}i易性腺理研究了两个邻近目标的复合电磁散射问题，将求解二次耦合散射场的汁算公式简化为求解一个目标的散射场和另一目标极化电流的积分方程彤』℃，降低了求解难度。在此基础上，用互易性原理分别研究了一维、二维导体微柯糙面与其上方会属导体平板目标的复合电磁散射及介质粗糙面与其上方球形粒j，-的复合电磁散射，结合互易性原理和粗糙面散射微扰法(SPM)及物理光学(PO)近似导出了复合敝射场的

2、计算公式并进行了数值计算，对计算结果进行了讨沦和分析。论文还分别讨论了⋯维动念分形粗糙面与其上方平板和球形粒子的复台}U磁敞射特性，应用互易性原理结合PO近似和Mie理论导出了满足粗糙面散射旗尔霍夫近似(KA)下复合散射场的计算公式．计算并分析了后向复合散射时序信号的分维特性：对动态分形糨糙面和平扳目标的复合散射场后向散射时删序J／0信号的多普勒谱进行了详细研究，讨沦了目标对复合散射场多普勒谱的影响。关键词；复合电磁散射互易性原理糨蓰面目标分形ABSTRACTInthispaper’thereciprocitytheoremisusedtOs

3、tudiedtheproblemofelectromagneticscatteringfromtwoadjacenttargets，Takingtheadvantageofthisnewlydevelopedtechnique．thedifficultyinformulatingthesecondaryscatteredfieldsfromthecompositetargetreducestotheevaluationofintegralsinvolvingthepolarizationcurrentsofonetargetandthesca

4、tteredfieldsfromtheOther．Basedontheaboveresults，theproblemsoftheelectromagneticinteractionbetweenaperfectconductingplateand1-D／2·Dconductingslightlyrandomroughsurfaceandtheproblemsoftheelectromagneticinteractionbetweenadielectricsphericalpanicleanddielectricsl!lghflyrandomr

5、oughsurfaceareinvestigated．Byusingthereciprocitytheorem，SmallPerturbationMethod(SPM)andPhysicalOptics(PO)approximation，thesolutionforthecompositescatteringfieldfromthecompositetargetisderivedandevaluated，andthenumericalresultsarediscussedandanalyzed．Thecompositeelectromagne

6、ticscatteringsfromaplate／asphericalpanicleaboxe1一Dtime—varyingfractalsurfacearealsoexamined．b)applyingthereciprocitytheoremandcombiningPOandMietheory,theanalyticalsolutionforthecompositescatteringfieldiSobtainedunderKirehIloff(KA)forroughsurface，thefractalcharacteristicofth

7、ecompositebackscatteringsignalisestimatedandanalyzed．Inaddition，theDopplerspectrumofthebackscatteringsignalfromthecompositemodeloftheplateabovethetime—varyingfractalsurfaceisstudiedindetail，andtheinfluenceofthetargetontheDopplerspectrumofthescatteringfieldiSdiscussed．Keywor

8、ds：CompositeelectromagneticscatteringReciprocitytheoremRoughsurfaceTargetFractal创新