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// Chapter 10 example 5
//------------------------------------------------------------------------------
clc;
clear;
// Given data
f = 10*10^9; // operating freq in Hz
PRF = 1000; // pulse rep. rate
Vr = 1000; // radial velocity
c = 3*10^8; // vel. of EM waves in m/s
// Calculations
fd = (2*Vr*f)/c // true doppler shift
fA1 = modulo( modulo(fd,PRF)-PRF,PRF)
fA2 = modulo( modulo(fd,PRF)+PRF,PRF)
if fA1 < fA2 then
fd = fA1; // apparent doppler shift
else
fd = fA2; // apparent doppler shift
end
Vr = (c*fd)/(2*f); // radial velocity in m/s
//output
mprintf('Radial velocity = %3.2f m/s\n The radar measures the target to be moving away from the radial velocity at %3.2f m/s though in reality\n it is moving towards the radar with a velocity of 1000 m/s',Vr,abs(Vr));
//------------------------------------------------------------------------------
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