mismatched filter for chirp signal

[Asraf Mohamed]

hi there,

i try to find the compressed signal output for squared window chirp signal by using mismatched filtet(chebyshev window). the results i got is not expected. please advise. thank you in advance.

clear all


fs = 10e8;                   
Ts = 1/fs;                 
f0 = 5e6;                    
k= 2.4e11;
dt = 1/fs;
taxis = 0:dt:25e-6;

y = sin(2*pi*(f0 + k/2*taxis).*taxis); y=y';
L=length(y);
 win=chebwin(L,120);
 y2=y.*win;
h=hilbert(y);
h1=real(h);
h2=imag(h);
 y3=xcorr(h2,y2);
 y4=mag2db(y3/max(y3));
 plot(y4);