compressed signal output for squared window chirp signal by using mismatched filter (chebyshev window)

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);