线性调频信号频谱分析.zip

%%demo of chirp signal T=10e-2; %pulse duration10us B=10e2; %chirp frequency modulation bandwidth 30MHz K=B/T; %chirp slope Fs=2*B;Ts=1/Fs; %sampling frequency and sample spacing N=T/Ts; t=linspace(-T/2,T/2,N); St=exp(j*pi*(30e2*t+1/2*K*t.^2)); subplot(211) plot(t*1e2,real(St)); xlabel('Time in u sec'); title('Real part of chirp signal'); grid on;axis tight; subplot(212) freq=linspace(-Fs/2,Fs/2,N); plot(freq*1e-2,fftshift(abs(fft(St)))); xlabel('Frequency in MHz'); title('Magnitude spectrum of chirp signal'); grid on;axis tight;