雷达脉内特征提取方法的研究

雷达脉内特征提取方法的研究巫胜洪(723,225001)0引言,,,,,,(DOA)(CF)(TOA)(PW)(PA)5,,5,1雷达脉内特征的分类,1.1,2:(1),;(2),,1.23()1.2.1:/;V,,,1.2.2,DDS(),,,,EW,:200106182512002,25(1):25~28:ML1.2.3,,,,,,,,2雷达脉内特征的提取方法,:,,,2.1:S(t)=A(t)cos[2f0+(t)](1):f0;(t);A(t),A(t)=Amrect(t/);;AmS(t):(t)=n(2):nS(t):(t)=kt2+0(3):kS(t):(t)=Cd(t)+0(4):Cd(t),:f(t)=S(t)+N(t)(5):N(t)f0,S(t),N(t),,S(t)11t1,(5):v(t)=f(t)f(t-t1)=[S(t)+N(t)][S(t-t1)+N(t-t1)]=S(t)S(t-t1)+N(t)N(t-t1)+S(t-t1)N(t)+S(t)N(t-t1)g(t)=v(t)dt=S(t)S(t-t1)dt+N(t)N(t-t1)dt=Rs(t,t1)+Rn(t,t1)(6):Rs(t,t1),Rn(t,t1)Rs(t,t1)=S(t)S(t-t1)dt=A(t)cos[2f0+(t)]A(t-t0)cos[2f0(t-t1)+(t-t1)]dt=b(t)cos[2f0t0+(t)-(t-t1)](7):b(t)=Bmrect[(t-t1)/(-t1)],Bm=1/2C1C2A2m,C1C2S(t),(t)=0,(2)(7),:Rs(t,t1)=b(t)cos(2f0t1)(8)S(t)LFM,(t)=kt2+0,(3)(7),:Rs(t,t1)=b(t)cos[2f0t1+2kt1t-kt21]=b(t)cos[2fkt+0k](9):fk=Kt1;0k=2f0t1-Kt1=fkS(t)(BPD),(t)=Cd(t)+0,(4)(7),:2625Rs(t,t1)=b(t)cos[2f0t1+Cd(t)-Cd(t-t1)](10),10,Cd(t)-Cd(t-t1)S(t),,,2.22,()(ZERODEADTIMECOUNTER),2,,1(EVENT),12360,(t),,,HP5371,,2.3(),Z,,FFTAR,22,:y(t)=x(t)h(t)(11):x(t);h(t):Sy(f)=Sx(f)SH(f)(12),:logSy(f)=logSx(f)+logSH(f)(13)FFT-1:Cy()=FFT-1[logSy(f)]=FFT-1[logSx(f)]+FFT-1[logSH(f)]=Cx()+CH()(14)CH(),,2.4(DRTM)8,1GHzDRFM8,2GHzDRFM,A/D,,271:,:S(t)=A(t)cos[2f0t+(t)t+(t)](15):f0;A(t);w(t);(t)A(t),w(t),(t)3:S(tn)=A(tn)cos[2f0tn+(tn)tn+(tn)](16):tn=nTs=n1/fs,fs=4f02M-1=2W2B,MZS(tn):r(tn)=A(tn)ej[(tn)tn+k(tn)+2f0tn]=A(tn)cos[2f0tn+(tn)tn+(tn)]+jA(tn)sin[2f0tn+(tn)tn+(tn)](17)A(tn)(tn)f(tn):|A(tn)|={Re[r(tn)]}2+{Im[r(tn)]2}(18):(tn)=arctanIm[r(tn)]Re[r(tn)]=2f0tn+(tn)tn+(tn),0(tn)2(19)f0w(tn)(tn)3,,:f(tn)=12(tn+1)-(tn)t(20)3结束语,,DSPDRFM,1,,..,1991(4):23~322ChoiHI,WiliamsWJ.Improvedtimefrequencyrepresentationofmulticomponetsignalsusingexponentialkernels.IEEETransAcoust.Speech,SignalsProcessing,1989,37(6):862~8713..,1992(1):1~11(上接第9页)0.00130.34960.34960.2000.300.02490.40.06220.600.01340.46840.56210.001=(0.00050.15130.40040.19530.3000)5结束语,(04004),1..:,19932..:,19852825