基于單矢量水聽器和分數(shù)階傅里葉變換的LFM信號處理技術研究.pdf

1、哈爾濱工程大學碩士學位論文基于單矢量水聽器和分數(shù)階傅里葉變換的LFM信號處理技術研究姓名：才振華申請學位級別：碩士專業(yè)：電子與通信工程指導教師：方爾正；胡兵20120617哈爾濱工程大學工程碩士學位論文ABSTRACTPresently，itisaverypracticalityandpopularityengineeringapplicationthausinghydrophonesignalprocessingbecomedaver

2、yimportantproblemandreseatchfieldatdomainofunderwateracousticsignalprocessingLinearFrequency—Modulated(chirp，LFM)signaldetectionandazimuthestimationisaimportantsubjectforpassivesonarsignalprocessingForLFMsignal，itcannoti

3、mproveSNRthatonlyreduceprocessbandwidthForsinglevectorhydrophone，thespacegainislimited，thedetectionandazimuthestimationcapabilityforLFMsignalwillfallat10wSNRThebasicprinciplesofvectorsignalprocessingarereviewedatfirstint

4、histhesisThen，thisthesisanalyzedmethodofpopularityLFMsignalprocessingincommonuseusedinprocessingLFMassinglevectorhydrophone，suchasShortTimeFourierTransform(STFT)，WignerVilleDistribution(WVD)，WaveletTransform(WT)Fractiona

5、lFourierTransform(FRFT)，andanalyzedthosepredominanceandshortcomingAtbasinonthoseanalyse，thisthesisadvanceamethodthatuseFRFTinsinglevectorsignalprocessingFirst，thismethodestimatethecarelessvalueofchirpratioapproximatelvin

6、time。frequencydomainforreducingconfinesoffracionalorderandthenfilterLFMsignleinfracionalorderfield，advanceLFMsignle’SSNR，estimatetheexactitudevalueofchlrpratioapproximatelyandusingFRFTattheLFMsignleandthenestimatethesign

7、alazimuthbyacousticintensityinfracionalorder矗eld‘Asresultofemulatedataandoceanexaminationdataprocessing，thosemethodswouldeffectivelyincreasethecapabilitythatsinglevectorhydroph。nedetectionandazimuthestimationforLFMsignal

8、Atonemoment，thismethodusedSTFTforpreprocessaccordflowofmoderntimessonarsignleprocessing，andcomputequantityisonthesmallsideThismethodhasbasicallysolvedcomputequantityhugenessmatterforFRFTDrocessLFMsignlesearchin2Dtime—fre