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+//Chapter-11 example 63
+//=============================================================================
+clc;
+clear;
+//Given data
+Vr      = 300;          // Velocity of radar in m/s
+Vair    = 200;          // velocty of aircraft in m/s
+f       = 10*10^9;      // Radar operating frequency
+Vo      = 3*10^8;       //vel of Em wave in m/s;
+
+//Calculations
+
+lamda   = Vo/f;         // wavelength in m
+Vrel    = Vr+Vair;      //relative radial vel. b/w radar and aircraft when approaching each other
+fd      = (2*Vrel)/lamda// Doppler frequency
+
+//Output
+mprintf('Doppler frequency = %3.2f KHz',fd/1000);
+//==============================================================================