The Radar Ambiguity Function - MATLAB Simulations for Radar Systems Design - page 224

colormap([.5 .5 .5])
colormap (gray)
grid
Listing 4.3. MATLAB Program Ðfig4_4.mÑ
% Use this program to reproduce Fig 4.4 of text
close all
clear all
eps = 0.0001;
taup = 2.;
fd = -10./taup:.05:10./taup;
uncer = abs( sinc(taup .* fd));
ambg = uncer.^2;
plot(fd, ambg,'k')
xlabel ('Frequency - Hz')
ylabel ('Ambiguity - Volts')
grid
figure(2)
plot (fd, uncer,'k');
xlabel ('Frequency - Hz')
ylabel ('Uncertainty - Volts')
grid
Listing 4.4. MATLAB Function Ðlfm_ambg.mÑ
ffunction x = lfm_ambg(taup, b, up_down)
eps = 0.000001;
i = 0;
mu = up_down * b / 2. / taup;
delt = 2.2*taup/250;
delf = 2*b /250;
for tau = -1.1*taup:.05:1.1*taup
i = i + 1;
j = 0;
for fd = -b:.05:b
j = j + 1;
val1 = 1. - abs(tau) / taup;
val2 = pi * taup * (1.0 - abs(tau) / taup);
val3 = (fd + mu * tau);
val = val2 * val3;
x(j,i) = abs( val1 * (sin(val+eps)/(val+eps))).^2;
end
end