激光多普勒信號的小波分析方法研究.pdf

1、武漢大學(xué)碩士學(xué)位論文激光多普勒信號的小波分析方法研究姓名：劉莉申請學(xué)位級別：碩士專業(yè)：測試計量技術(shù)及儀器指導(dǎo)教師：劉會金宋元勝20030425AbstractWaveletanalysisisamongthemostactiveresearchfieldsintheworldandithasbeenwidelyusedforsignal—processionInthisthesistheapplicationofwaveletanaly

2、sistothedetectionandprocessioneflaserDopplersignalissystemicallyanddeeplystudiedThemajorworkcanbesummarizedasfollows：TheworkprincipleofLaserDopplerVelocimetrySystemisillustratedinthefirstpartofthispaperAndthecorrespondin

3、gtheeryofapplicationofwaveletanalysistoDopplersignalprocessionisdiscussedDuetothedifferentenergydistributefeaturesofsignalandwhitenoise，themethedofDopplersignaldetectionbasedonwaveletlxansformisbroughtforwardTheinformati

4、onofsigrlalisobtainedandtheoccurrencetimeofDopplersignalcrustcanbedetectedbyliftsmethodFortheanalyzingofsignalfeaturestherevisedMorletwaveletisusedasthewaveletbasefunctionofsealogramanalysis，whichnotonlybears也egoodfeatur

5、esofMorletwaveleti11peakvalueanalysis，butalsodecreasesealcu／ationstepsoftheoriginalwaveletBythesimulationofMATLAB，thevalidityofthismethodisverifiedandtheinfluencesonscalogramanalysisofSNRsamplefrequencyandthestatusofmult

6、i—particlesindetectionareaarediscussedindetailsBasedontheanalysisofthecurrentmethodsofwaveletdenoisingthewhitenoiseremoving—disturbalgorithmisputforward，whichcombinestheadvantagesofwaveletpackettransformfortimefrequencya

7、nalysisandDoorLimitThresholdValueMethodIntheprocessofdenoising，thenormconceptionofsubfrequencyslripisintroducedfortheoptimumexpressionbywaveletpacketbasefunctionsofDopplersigrlalMeanwhile，therevisedDoorLimitMethodisadopt

8、ed，whichintegratesthesoftandhardDoorLimitMethodsUsingthesewaveletpacketdenoisingalgorithms，theDopplersignalcanbeextractedevenwhenthenoiseintensityisverystrongKeywords：LaserDopplerWaveletAnalysis，Scalogram，WaveletPacketDe