1、subplot(221);tfr,t,f = tfrwv(x1);contour(t,f,abs(tfr);title(WVD法T-F等高图WVD(SNR=0db)xlabel(时间subplot(222);tfr,t,f = tfrwv(x2);WVD法T-F等高图WVD(SNR=5db)subplot(223);tfr,t,f = tfrwv(x3);WVD法T-F等高图WVD(SNR=10db)subplot(224);tfr,t,f = tfrwv(x4);WVD法T-F等高图WVD(SNR=20db)%subplot(221);%plot(real(x);%title(幅值图%xla
2、bel(频率Hz%ylabel(振幅%tfrwv(x1);WVD(SNR=0db)时间t频率fclcx1=fmlin(256,0.1,0.35);x2=fmlin(256,0.2,0.4);x=x1+x2;tfr,t,f = tfrwv(x);tfr,t,f = tfrstft(x);%- 11-4-21 上午9:59 -%help sasda=0.004;fs=250;SNR=10;n=0:256-1;s=0.05*sasd(256,0.8);w1=1.72;c=-0.025;t0=160;t1=100;x0=fmlin(256,0.1,0.3);x=x0;x1=x+s;plot(n,rea
3、l(x1);线性调频信号和alpha稳定随机信号的叠加P=(fft(x1);plot(n/length(n),abs(P); tfr,t,f = tfrstft(x1);hold on;STFT法T-F等高图 tfr1,t1,f1 = flotfrstft(x1);contour(t1,f1,abs(tfr1);FLOSTFT法T-F等高图figure(1);plot(n,real(x);两个复线性调频信号P=fftshift(fft(x);figure(2);两个复线性调频信号频谱figure(3);P=fftshift(fft(x1);figure(4);figure(5); tfr,t,
4、f = tfrwv(x1);WVD法T-F等高图figure(6); tfr1,t1,f1 = flotfrwv(x1);FLOWVD法T-F等高图subplot(321);subplot(322);subplot(323);subplot(324);subplot(325);subplot(326);线性调频信号P=(fft(x);线性调频信号频谱P=fft(x1);tfr,t,f = tfrpwv(x1);PWVD法T-F等高图tfr1,t1,f1 = flotfrPwv(x1);FLOPWVD法T-F等高图线性调频信号和ALPHA稳定随机信号性调频信号线性调频信号和ALPHA稳定随机信号频谱P1=(fft(x);plot(n/length(n),abs(P1);subplot(225);subplot(226);subplot(231);subplot(232);subplot(233);subplot(234);subplot(235);subplot(236);ti