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//Chapter-11 example 18
//=============================================================================
clc;
clear;
//input data
F = 10*10^9;//operating frequency of radar in Hz
Vo = 3*10^8;//Velocity of EM wave in m/s
Vr1 = 100;//velocity of one aircraft in m/s
theta = 45;//angle b/n velocity vector and radar axis for second aircraft
Vr = 200;//vel in m/s
//Calculations
lamda = Vo/F;//wavelength in m
Fd1 = (2*Vr1)/lamda//doppler shift due to 1st aircraft
Vr2 = Vr*cos(45*%pi/180)//radial velocity of the second aircraft
Fd2 = (2*Vr2)/lamda//doppler shift due to 2nd aircraft
Fd = Fd2-Fd1//difference in doppler shift in Hz
T = 1/Fd;//time required to resolve the aircraft in sec
//Output
mprintf('Minimum time required to resolve the aircrafts is %g usec\n',T*10^6);
mprintf(' Note: in textbook there is a mistake in the calculation of doppler shift Fd1');
//============end of the program================================================
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