abel('本地载波频谱');pauseder=dem(1:Lt).*c(1:Lt);subplot(325)plot(t,der);axis([0t0-RR]);xlabel('t');ylabel('混频后的信号');subplot(326)[derf,der,df1,f]=T2F(der,dt,df,fs);plot(f,fftshift(abs(derf)));axis([-303001.2]);xlabel('f');ylabel('混频后的信号频谱');pausefigure(4)[LPF,f]=lp_f(length(der),Bw_eq,df1,fs,2);subplot(322)plot(f,fftshift(abs(LPF)));xlabel('f');axis([-151502]);ylabel('理想LPF');pauseDM=LPF.*derf;[dm]=F2T(DM,fs);subplot(323)plot(t,dm(1:Lt));axis([0t0-RR]);xlabel('t');ylabel('LPF输出信号');[dmf,dm,df1,f]=T2F(dm(1:Lt),dt,df,fs);subplot(324)plot(f,fftshift(dmf));axis([-3302]);xlabel('f');ylabel('LPF输出信号频谱');pausedmd=dm(1:Lt)-mean(dm(1:Lt));subplot(325)plot(t,dmd);axis([0t0-R/2R/2]);xlabel('t');ylabel('恢复信号');[dmdf,dmd,df1,f]=T2F(dmd,dt,df,fs);subplot(326)plot(f,fftshift(dmdf));axis([-3301.2]);xlabel('f');
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