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1、北京交通大學(xué)碩士學(xué)位論文FSK信號高分辨率檢測方法研究姓名：謝丹鋒申請學(xué)位級別：碩士專業(yè)：交通信息工程及控制指導(dǎo)教師：魏學(xué)業(yè)20050301北京交通大學(xué)碩士學(xué)位論文ABSTRACTAtpresem，F(xiàn)SKsignalis、videlyusedtotransferthccontrolinfb鋤ationoftrainsiⅡrailwayWimmedeVelopmentofmodemrailwaytransportations，highprecisiondetectionofFSKsi弘a1．sdemallded．Ast11e廿leoryalldeXpcrie
2、nceofclassicalspectIⅦnesthatearerelativelymatIIre，itisincommonuseinmedetectionofrailwayFSKsignal．Buttheprccisionofspectrumes廿mationisinnuencedbecauseof也einhere】1tdisadvaJltagesofclassicalspectnlIIlestiI!nate．In恤ispaper'metheoryofcl昭sicalspectnlmestimationwillbede印inVestigated．Base
3、onit，c1嬲sicalspec衄mlestima士ionanditsimproVement撕thmeticiscompared．ThearinlⅡ1eticofZFFTisputfbr、^，ardbecauseofmespecmlmcharacteristicofFSKsignal．0n廿1ebasisOfmeor)rstudyandcomputersimulation，meM曲precisiondetectionofcarrierfhquencyalldmodulatmg缸quencyofFSKareattainedat1ast．nespe咖皿ofF
4、SKisdiscrete．ButmepeakValuesofspectnInlarenotrelevalltupanddownfbquencyforFSKisno“inearlymodulated．Thatistosay，evenifwecaIlhi曲lydetecteverydiscretelineofFSKspec饑IIll，wearcllIlabletogetupaIlddown療equencyWiththefb姍ermeⅡ10d0finterceptingsingle舶quencysignalmerearehugeinnuenceonthedetc
5、ctionprccisionwhetherwecaIlgcta11exactsingle＆qucncysigllal．TheresearchstressoftllispaperisusingthememodofARmodelspectrumestimationt0realizethedetectionofupanddownfkquencyofFSK．Basedontlleresearchofthccharacteristica11dtheoryandarithmetica11dapplicatiOnmngeofARmOdelspec咖estimation，
6、thedetectionaboutthesinewavesi弘alaIldFSKsi鯽alareanalyzedwimcomp“cersimul撕on．Adetectionmethodofupallddown丘equencyofFSKbasedonAR2%&78studya11dsimulationsoRwareprogramsaredesignedtovalidate血earimmeticinthispapeLTheselectionofnlerankofARmodeljsalsodiscussed．Keyword：Spec㈣estimate；class
7、icalspectmmestimate；FSK；FFT；modcmspectrumestimate；ARmodel；Burg；resolution3stimate；ARmodel；Burg；re"x北京交通大學(xué)碩士學(xué)位論文信號處理的重要研究課題。利用給定的N個樣本數(shù)據(jù)估計～個隨機信號的功率譜密度叫做譜估計，功率譜密度定義為相關(guān)函數(shù)的傅里葉變換，譜估計方法可以分為兩大類：經(jīng)典功率譜估計和現(xiàn)代譜估計。經(jīng)典功率譜估計都是以離散傅立葉變換(DFT)為基礎(chǔ)采用FFT算法，其主要缺陷是頻率分辨率低；而現(xiàn)代譜估計具有頻率分辨率高的優(yōu)點，因此，有時又把它叫做高分辨率譜估計
8、。經(jīng)典譜估計和現(xiàn)代譜估計的發(fā)展既有聯(lián)系又有各自的特點。1．21經(jīng)典
