chirp.m线性调频信号

%%demo of chirp signal
T=10e-6;                          %pulse duration10us
B=30e6;                           %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/2T/2N）;
St=exp（j*pi*K*t.^2）;