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//Chapter 5, Example 5.11, page 208
clc
//Initialisation
d=2500 //distance in Km
re=6370 //radius of earth in Km
dt=6 //elevation angle in degree
f1=15 //frequency in MHz
los1=42 //loss
pi=3.14
//Calculation
teta=d*(2*re)**-1 //in radian
teta1=teta*180*pi**-1 //in degree
phi=90-dt-teta1
l=(2*re*sin(teta))/sin(phi*pi/180)
fsl=32.4+(20*log10(f1))+(20*log10(l)) //Free space loss
pr=57+6-fsl-los1 //receving power in dB
pr1=10**(pr/10) //receving power in Watt
//Results
printf("Power = %.2f pW",(pr1*10**12))
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