线性调频信号的压缩以及加窗处理

%线性调频信号的实部和虚部及时域脉压输出 clear all; clc; T=16e-6; B=5e6; K=B/T; fs=6*B; Ts=1/fs; N=T/Ts; t=-T/2:T/(N-1):T/2; s=exp(j*pi*K*t.^2); y=conv(s,conj(s)); len=length(y); t1=-T/2:T/(len-1):T/2; figure;plot(t,real(s));grid on;axis([-1.2e-5 1.2e-5 -1 1]);xlabel('时间(s)');ylabel('幅度');title('LFM信号的I路'); figure;plot(t,imag(s));grid on; axis([-1.2e-5 1.2e-5 -1 1]);xlabel('时间(s)');ylabel('幅度');title('LFM信号的Q路'); figure;plot(t1,20*log10(abs(y)/max(abs(y))));grid on;axis([-1.2e-5 1.2e-5 -90 0]);xlabel('时间(s)');ylabel('幅度(dB)');title('时域脉压后的波形(未加权)'); subplot(311);plot(t,real(s));grid on;xlabel('time(s)');ylabel('amplitude(dB)');title('real part of LFM:T=16us,B=4MHz');axis([-T/2 T/2 -1 1]); subplot(312);plot(t,imag(s));grid on;xlabel('time(s)');ylabel('amplitude(dB)');title('image part of LFM:T=16us,B=4MHz');axis([-T/2 T/2 -1 1]); subplot(313);plot(t1,20*log10(abs(y)/max(abs(y))));grid on;axis([-1.2e-5 1.2e-5 -90 0]);xlabel('时间(s)');ylabel('幅度(dB)');title('时域脉压后的波形(未加权)');