基于alpha稳定分布理论的无人机侦察信道建模与信号调制识别技术研究

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1、AbstractTheunmannedaerialvehicle(UAV)hasbeenincreasinglywidespreadusedincivilianfrequencymonitoringandmilitaryelectroniccountermeasureasanewtypeofequipment.However,becauseofthecomplexelectromagneticenvironmentandnon-cooperativepositiontheUAVworkin,therewillbeseriouspulsenoiseandmultipathf

2、adinginitsreconnaissancechannel,whichleadtotwoproblems:ononehand,traditionalmodelcannotaccuratelydescribetheUAVreconnaissancechannel;ontheotherhand,pulsecharacteristicofthenoiseinthereconnaissancechannelresultsintheexistingsignalprocessingmethodbasedonGaussiandistributioninvaliding.Aiming

3、attheseproblems,AlphastabledistributiontheorywasintroducedtoresearchontheUltrashortwaveandHFchannelmodelingandsignalmodulationrecognitionforUAVreconnaissanceinthisthesis.Theresearchresultsimprovedexistingmodelsandalgorithms,whichisofimportanttheoreticalsignificanceandpracticalvalueinnon-G

4、aussiansignalprocessingandUAVapplication.Theinnovativeachievementsobtainedinthisthesiscanbebrieflysummarizedasfollows:1.AccordingtothefadingmechanismofUltrashortwavewirelesschannel,aimingattheimpactofthecomplexelectromagneticenvironmentandnon-cooperativepositiontoUAVreconnaissancechannel,

5、traditionalwide-sensestationary-uncorrelatedscattering(WSSUS)modelwascorrectedtomodelUAVUltrashortwavereconnaissancechannel.Alphastabledistributionnoisewasusedtosimulatethenoiseenvironment,whichimprovedflexibilityandpracticability;andWSSUSsystemparameterdeterminationbasedonflightcondition

6、sandenvironmentwasintroducedtomakethemodelconformbettertothepractice.MonteCarlosimulationprovedcorrectnessandeffectivenessofthismodel.2.AccordingtothecharacteristicofHFionosphericchannelsandthepropertiesofUAVmovement,improvedHFbroadbandITSmodelwasadoptedtomodelUAVHFsky-wavereconnaissancec

7、hannel，andsomesuggestiononUAVpracticalapplicationwasproposedinaccordancewiththecharacteristicofUAVreconnaissancechannel.Thenovelmodelovercomedthefaultsoftranditionalmodelsinflexibility,complexityandaccuracy:Alphastabledistributionwasappliedtosimulatenoiseenvironment