Читать книгу Inverse Synthetic Aperture Radar Imaging With MATLAB Algorithms - Caner Ozdemir - Страница 51

%-------------------------------------------------------- % This code can be used to generate Figure %-------------------------------------------------------- clear close all % TIME DOMAIN SIGNAL a = 0:.1:1; t = (0:10)*1e-3; stem(t*1e3,a,'k','Linewidth',2);% Figure 1-11 (a) set(gca,'FontName', 'Arial', 'FontSize',12, 'FontWeight','Bold'); xlabel('time, ms'); ylabel('s[n]'); axis([-0.2 10.2 0 1.2]); % FREQUENCY DOMAIN SIGNAL b = fft(a); df = 1./(t(11)-t(1)); f = (0:10)*df; ff = (-5:5)*df; figure; stem(f,abs(b),'k','Linewidth',2); % Figure 1-11 (b) set(gca,'FontName', 'Arial', 'FontSize',12, 'FontWeight','Bold'); xlabel('frequency, Hz') ylabel('S[k]'); axis([-20 1020 0 6.5]); figure; stem(ff,fftshift(abs(b)),'k','Linewidth',2);% Figure 1-11 (c) set(gca,'FontName', 'Arial', 'FontSize',12, 'FontWeight','Bold'); xlabel('frequency, Hz') ylabel('S[k]'); axis([-520 520 0 6.5]);