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+//chapter-11 page 504 example 11.3
+//==============================================================================
+clc;
+clear;
+
+//For a marine radar system
+Pt=250000;//peak transmitted power in W
+G=4000;//power gain of the antenna
+R=50000;//maximum range of radar in m
+Pr=10^(-11);//minimum detectable signal in W 
+f=10*10^9;//frequency of radar in H
+c=3*10^8;//Velocity of light in m/sec
+
+//CALCULATION
+w=c/f;//wavelength in m
+Ae=((G*w^2)/(4*(%pi)));//cross sectional area of the radar antenna in sq m
+s=((Pr*(4*(%pi)*R^2)^2)/(Pt*G*Ae));//The cross section of the target the radar can sight in sq m
+
+//OUTPUT
+mprintf('\nThe cross section of the target the radar can sight is s=%2.2f sq m',s);
+
+//=========================END OF PROGRAM===============================