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1、Adjusting3-PulseCancellertoEnhanceSlowRadarTargetsItzikCohen,andNadavLevanonDept.ofElectricalEngineering–Systems,TelAvivUniversity,TelAviv,6997801,IsraelAbstractDopplerprocessingofacoherentperiodicwaveformWithassumption(b)andtheweightsin(1),theusuallyemploy
2、sann-pulse(orn-period)cancellerfollowedbyimprovementinthesignal-to-clutterratiobetweentheinputaweightedFFT.Earlymovingtargetdetection(MTD)usedaandtheoutputofthe3-pulsecancellerisgivenbynamelysimple3-pulsecancellerastheMTIfilter.MTDinground-basedradarfacesac
3、onflictbetweenclutterattenuationand−11122slowtargets’visibility.Thepapersuggeststwosimple⎡⎤()SC⎡41−−()σσωωTTrr()2⎤==out⎢1−+22⎥IeEe.(3)modificationstoa3-pulsecancellerthatwilleasethisconflict.⎢⎥Detectingveryslowtargetswithinstationarycluttergains⎣⎦()SCin⎣33⎦
4、importanceinborderorperimetersafeguarding.Optimizingtheimprovementfactor[4,5]willyieldIndexTerms—Radar,Dopplerprocessor,MTI,MTD,pulse-canceller,weightwindow,clutterattenuation.dependenceofthemiddleweightW2asfunctionofσωTrthatwilldifferslightlyfrom–2.Othermo
5、dificationstotheblockdiagramofthepulsecancelersI.INTRODUCTIONweresuggestedveryearly[6,7].EarlydesignofMTD(movingtargetdetection)[1,2,3]Theinterestinthispaperisinveryslowtargets,soinvolvedacoherentpulsetrainsignal,processedcoherentlyassumption(b)doesnothold,
6、andthequestionishowtoonreceivebya3-pulsecanceller,followedbyaweightedsignificantlyattenuatealmoststationaryclutterandyetdoFFT.The3-pulsecanceller(Fig.1)isasimpleFIRlinearnotattenuateslowtargetstoomuch.Thefollowingsectionsfilterwhichresultsinsignificantatten
7、uationofclutterwilldiscusstwosimplemodificationstothe3-pulsereturn.cancellerandthenshowtheexpectedspectralresponseofTheparameterswereusuallydesignedwithtwotheprocessorwhichcascadesthemodifiedMTIfilterandtheFFT-basedDopplerprocessor.assumptions:(a)theclutter
8、spectraldensityiszero-meanGaussianwithstandarddeviationofσωrad/s;(b)thetarget’sDopplershiftisuniformlydistributedbetweenII.3-PULSECANCELLERWITHMODIFIEDWEIGHTS−≤12()TfrD≤12()Tr,whereTristhepulseThe3-pul
