復雜目標雷達散射截面的分析方法.pdf

1、南京理工大學碩士學位論文復雜目標雷達散射截面的分析方法姓名：楊端義申請學位級別：碩士專業(yè)：電磁場與微波技術(shù)指導教師：沙侃陳如山20090601Abstract碩士學位論文AbstractWiththedevelopmentofcomputationalelectromagnetics，electromagneticscatteringofelectricallargetargetattractsmoreandmoreattentionR

2、apidlyanalyzingtheRCSofelectricallargetargethasallimportantsignificanceonthestealthtechnologyandantistealthtechnologyInordertoeffectivelycalculatetheRCSofthetarget，thisthesismainlyconcentratesonthefollowingresearches：the

3、POmethodandtheequivalentedgecurrentsmethodwhichiSusedtoamendthePOmethod；themethodofSBRwhichiSbasedontheraydensitynormalization(RDN)；theapplicationofPOmethodincalculatingthescatteringcharacteristicofplasmacoatedtargetandt

4、hehybridmethodofPOandMoMFirstlythePOmethodinhigh—frequencymethodsisintroducedindetailinthisthesis，anditisamendedbythemethodoftheequivalentedgecurrentsSecondlythemethodofRDN—SBRiSformedintroducingRDNbasedontheSBRItiSacurr

5、entapproximationarousedbymulti—reflectionofelectromagneticwave，becauseofthisapproximationthefieldandcurrentonpatchesCanbeapplieddirectlybythehybridmethodThirdlyduetotheuniquestealthperformanceofplasmaanditsapplicationint

6、hestealthtechnologyofMilitarytargets，thereflectioncoefficientswhicharedeterminedbytheplasmaparametersareinvestigatedbydividingthenon—uniformplasmaintoaseriesofisotropymedialayersThentheRCSoftheplasmacoatedoftheconductort

7、argetiscalculatedbasedonthemethodofPOFourthlytheMoMrepresentsasuitableprocedurefordealingwithelectromagneticscatteringproblemsofarbitrarygeometricalshapeinthelowerfrequencyrangeHoweverwithincreasingfrequencybothcomputati

8、ontimeandmemoryrequirementoftenexceedavailablecomputercapacitiesThereforeacurrentbasedhybridmethodcombiningtheMoMwiththePOapproximationsuitableforthree—dimensionalperfectlyconductingbodiesisproposedinthisthesisThehybridf

9、ormulationallowsasubstantialreductionofcomputationtimeandmemoryrequirement，whiletheresultsareinreasonableagreementwitllthosebasedonanapplicationoftheMoMalone。FortheiterativeproblemduringsolvingtheproblemsbyMoM，inthisthes

10、isthemulti—resolutionpre。processingtechnologyisintroduced，whichimprovesthecalculationefficiencyinthesameaccuracyKeywords：RadarCrossSectionPhysicalOptics，Equivalentedgecurrents，PlasmaShootingandBouncingRays，GeometricalOpt