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+//Chapter-11 example 10
+//=============================================================================
+clc;
+clear;
+//input data
+F  = 9*10^9;//Transmitting Frequency of Radar
+Vr = 800;//velocity of aircraft in Kmph
+Vo = 3*10^8;//velocity of EM wave in m/s
+
+//Calculations
+
+Va    = Vr*(5/18)//velocity of aircraft in m/s
+Fd    = (2*Va*F)/Vo//Doppler Frequency shift in Hz
+Fr    = F+Fd;//frequency of reflected echo in Hz
+//Output
+mprintf('Doppler Frequency shift is %g Hz\n frequency of reflected echo is %e Khz\n',Fd,Fr/1000)
+mprintf('Note: doppler frequency shift wrongly printed in Text Book as 1333.3 Hz');
+//=============end of the program==============================================