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+//Chapter-11 example 57
+//=============================================================================
+clc;
+clear;
+//input data
+f       = 10*10^9;       // operating freq. of radar in Hz
+Vr      = 800;           // radial ve. of of aircraft in kmph
+Vo      = 3*10^8;       //vel of Em wave in m/s;
+
+//calculations
+
+lamda   = Vo/f;        // Wavelength in m
+Vr1     = Vr*5/18      // kmph to m/s conversion
+fd      = 2*Vr1/lamda;  // Doppler shift freq, in Hz
+
+//Output
+mprintf('Doppler shift frequency fd = %3.2e Hz',fd);
+
+//==============================================================================