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1、Dechirp-on-ReceiveLinearlyFrequencyModulatedrangecompression,canbeexpressedasformsofRadarasaMatched-FilterDetectormodifiedordegradedmatchedfilteringwithasingleperiodofalinearlyfrequencymodulatedchirpwaveform.II.DECHIRP-ON-RECEIVERADARASAItiswidelyassumedt
2、hatdechirp-on-receivelinearlyfrequencyMATCHED-FILTERRECEIVERmodulatedradarisaformofmatchedfiltering,althoughthisisrarelydemonstrated.InthiscorrespondenceitisshownthatthisA.TheGeneralCasetypeofradarreceiver,specificallylinearlyfrequencymodulatedIndechirp-o
3、n-receiveradars,thereceivedsignalisCW(LFMCW)radarandstretchprocessingradar,closelymixedwithacopyofthetransmittingradarsignal.approachesmatchedfiltering,andsocanbeassumedtohavetheThisprocessdownconvertsthereceivedsignal,samewell-understoodpropertiesandadva
4、ntagesasthatclassofwhichisassumedtobejustthesuperpositionofdetectors.delayed,attenuatedcopiesofthetransmittedsignalandadditive,white,Gaussiannoise.Theprocessisassumedtobelinearonthereceivedsignal.ThedownconvertedanddechirpedsignalissampledandaI.INTRODUCTI
5、ONFouriertransformisusedtocalculatethespectrumofthesignal.Dechirp-on-receivelinearlyfrequencymodulatedThisprocessyieldstherange-compressedradarradaroperatesbytransmittingasignalwithalinearlyrangeprofile,anditcanbesummarizedasfollows.changing(i.e.,chirping
6、)frequencyandthenmixingFirst,assumethatthetransmittedsignal,andsothethereceivedechoeswithacopyofthetransmittedmodelforwhichtosearchinthereceivedsignal,isofsignaltoachievedownconversionanddechirping.Thetheformdownconvertedechoeseachhaveaconstantfrequency(j
7、¼°t2)m(t)=rect(t=T)e(2)thatislinearlyrelatedtotheirround-tripdelaytime.FouriertransformingthecompositedechirpedsignalwhereTisthedurationofthetransmittedchirpandseparatesoutthesignalenergyasafunctionof°isthefrequencychirprate(fortheLFMCWcase,frequency,whic
8、hlinearlytranslatesintorange.Thisthisisasingleperiod).Thenthegeneralformforthefrequencyspectrumisthecomplexradarrangeprofile.range-compressedrangeprofilefordechirp-on-receiveMatchedfilteringisawell-definedformofproc
