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ID:34779453
大小:1.28 MB
页数:68页
时间:2019-03-10
《探索fsk信号高分辨率检测方法研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、北京交通大学硕士学位论文FSK信号高分辨率检测方法研究姓名:谢丹锋申请学位级别:硕士专业:交通信息工程及控制指导教师:魏学业20050301北京交通大学硕士学位论文ABSTRACTAtpresem,FSKsignalis、videlyusedtotransferthccontrolinfb锄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饥IIll,wearcllIlabletogetupaIlddown疗equencyWiththefb姗ermeⅡ10d0finterceptingsingle舶quencysignalmerearehugeinnuenceonthedetc
5、ctionprccisionwhetherwecaIlgcta11exactsingle&qucncysigllal.TheresearchstressoftllispaperisusingthememodofARmodelspectrumestimationt0realizethedetectionofupanddownfkquencyofFSK.Basedontlleresearchofthccharacteristica11dtheoryandarithmetica11dapplicatiOnmngeofARmOdelspec咖estimation,
6、thedetectionaboutthesinewavesi弘alaIldFSKsi鲫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北京交通大学硕士学位论文信号处理的重要研究课题。利用给定的N个样本数据估计~个随机信号的功率谱密度叫做谱估计,功率谱密度定义为相关函数的傅里叶变换,谱估计方法可以分为两大类:经典功率谱估计和现代谱估计。经典功率谱估计都是以离散傅立叶变换(DFT)为基础采用FFT算法,其主要缺陷是频率分辨率低;而现代谱估计具有频率分辨率高的优点,因此,有时又把它叫做高分辨率谱估计
8、。经典谱估计和现代谱估计的发展既有联系又有各自的特点。1.21经典
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