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1、TheKalmanfilterbasedresearchofT-wavealternansdetectionalgorithmAbstract:Asthesecondlargestcauseofdeathinhumanbeingsonlybehindcancer,suddencardiacdeath(SCD-SuddenCardiacDeath)isfeaturedassuddenonsetanddifficulttorescue.Therefore,forthesepatients,earlydi
2、agnosis,earlyinterventionisthemosteffectivetreatment.TWA(Twavealternans)asthedetectionofSCD-likeillnessisanimportantindicatorofhow(non-invasive)toobtainaccuratedatainaTWAresearchwhichisfocusedoninrecentyearsintheindustry.ThispaperpresentsamodifiedKalma
3、nfilter-based(non-steadystate)TWAdetectionalgorithm:Firstofall,preprocessing,filteringnoiseandbaselinedriftofECG;methodusingwavelettransformmodulusextremumofQRSandTwaves,seevehiclefeatureslocationofthepoint;furtheralignmentandextractstheTwaveTwavematri
4、x;accordingtothestrategy(inaccordancewiththeoddandeven)ontheTwavematrixre-grouping;KalmanfilterwereusedontwogroupsofTwavematrix;calculatethedifferencebetweentwogroupsofTwavematrix,thenthevectormodulusmaximatoidentifythevectorthroughvectormaximamodules,
5、andmakesthemeanvectorasthetestingstandards.Throughsimulationresults，thisalgorithmforthecorrelationcoefficientofTWAdetectionvaluesandrealvaluesreaches97%,andnotonlycanittesttherateofTwavealternans,butalsocanidentifyshort-termTwavealternans.[keyword]:TWA
6、KalmanextremumofwavelettransformmodulusSuddenCardiacDeath[Introduction]:Suddencardiacdeath(SCD-SuddenCardiacDeath)isadeathcausedbyheartattack.Accordingtotheagency'sstatistics,suddencardiacdeathhasbecomethesecondlargestcauseofdeathaftercancer.Thereareab
7、out45.000casesinUnitedStates,andover1.8millioncasesperyearinChinaAdditionally,theincreasinglyseriousenvironmentalpollution,thepressurecontinuedtoincrease,thisfigureisconstantlyincreasingbecauseoftheincreasinglyseriousenvironmentalpollutionandthecontinu
8、edpressure.Astheincidencesuddencardiacdeathhavethecharacterofsuddenonsetanddifficulttorescueoncethediseasehappens,thereislittletimeleftformedicinepersonnel,thusthesurvivalrateisverylow.Therefore,themaintreatmentforsuddencardiacdeathisth
