mismatch.m
上传用户:szahd2008
上传日期:2020-09-25
资源大小:1275k
文件大小:1k
- clear all
- eps = 1.5e-5;
- wind = hamming(512)';
- t = 0:0.001:.5;
- y = chirp(t,0,.25,20);
- figure(1)
- plot(t,y);
- yfft = fft(y,512) ;
- ycomp = fftshift(abs(ifft(yfft .* conj(yfft))));
- maxval = max (ycomp);
- ycomp = eps + ycomp ./ maxval;
- ycompdb = 20. .*log10(ycomp);
- figure(1)
- del = .5 /512.;
- tt = 0:del:.5-eps;
- plot (tt,ycompdb,'k')
- xlabel ('Relative delay - seconds');
- ylabel('Normalized compressed pulse - dB')
- grid
- %change center frequency
- y1 = chirp (t,0,.25,21);
- y1fft = fft(y1,512);
- y1comp = fftshift(abs(ifft(y1fft .* conj(yfft))));
- maxval = max (y1comp);
- ycomp = eps + y1comp ./ maxval;
- y1compdb = 20. .*log10(y1comp);
- figure(2)
- plot (tt,y1compdb,'k')
- xlabel ('Relative delay - seconds');
- ylabel('Normalized compressed pulse - dB')
- grid
- %change pulse width
- y2 = chirp (t,0,.26,20);
- y2fft = fft(y2,512);
- y2comp = fftshift(abs(ifft(y2fft .* conj(yfft))));
- maxval = max (y2comp);
- ycomp = eps + y2comp ./ maxval;
- y2compdb = 20. .*log10(y2comp);
- figure(3)
- plot (tt,y2compdb,'k')
- xlabel ('Relative delay - seconds');
- ylabel('Normalized compressed pulse - dB')
- grid