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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================================================