19395.硬限幅和軟限幅陣列中的隨機(jī)與振蕩共振研究

1、分類號(hào)：TP391密級(jí)：非密UDC：621.3學(xué)校代碼：11065碩士專業(yè)學(xué)位論文硬限幅和軟限幅硬限幅和軟限幅陣列中的隨機(jī)陣列中的隨機(jī)與振蕩與振蕩共振研究共振研究任昱昊指導(dǎo)教師段法兵教授學(xué)科專業(yè)名稱系統(tǒng)理論論文提交日期2015.5.27論文答辯日期2015.5.29答辯委員會(huì)主席劉慧明IIAbstractSincethestochasticresonance(SR)effecthasbeendiscoveredin1981greatad

2、vancesinboththeiesapplicationsofSRhavebeenmadeinthelastthreedecades.EspeciallyusingtheprincipleofSRtheimprovementofthesignaltonoiseratio(SNR)gainofasignaltransmissionsystemmanifestsitspracticalsignificanceinthefieldofsig

3、nalprocessing.OfcourseabetterSNRgaincanbeachievedbycooperatingtheSRmechanismwiththeconventionalsignalprocessingmethod.InthispaperwestudytheSRvibrationalresonance(VR)inaparallelarrayofsubsystemsbythemeasureofSNRgainalsodi

4、scussthesubsystemsnoisetypesaimingtostudytheabilityofSRVRonenhancingtheinputweaksignal.Limitercircuitsarewidelyusedinthesignalprocessingtaskssuchaswavefmtransfmationshapingoverloadprotectionantiinterferencesincethesecirc

5、uitsareconvenienthaveahighaccuracyinpractice.UsingvibrationresonancestochasticresonancemethodstheoutputSNRcanbeenhancedinthesecircuitstheprocessingdetectionofaweaksignalcanbemeeffectively.Inthispaperweinvestigateaparalle

6、larrayofsoftthresholdhardlimitersenssftransmittingacommoninputsignalburiedinexternalnonGaussiannoise.IneachsenstheunifmnoisethehighfrequencyvibrationisinjectedtoimprovetheSNRgain.Thenoiseenhancedeffectsareobservedinbotha

7、rraysofsoftthresholdhardlimitersenss.Interestinglyfanunbiasedinputsignalthestochasticmultiresonancephenomenonappearsinthehardlimiterarray.WenotethatVRexistsinbothkindsofparallelarrayswhentheinternalnoiseishighfrequencyin

8、terferencesignal.FinallywefoundthattheoptimalSNRgainviatuningthehighfrequencyinterferencesishigherthanthatbyaddinginternalnoisetermswhichisconfirmedbythePSpicecircuitexperiments.Keywds:ArraystochasticresonanceVibrational