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//Example 2.6.1
//Doppler Shift for A leo Satellite
//Part1 Velocity of Satellite in Orbit
//Variables
re=6378 //radius of earth in km
h=1000 //altitude in km
a=re+h
u=(3.986004418*10^5)
//Calculation
//Part1 Velocity of Satellite in Orbit
T=sqrt((4*(%pi^2)*(a^3)/u))
circum=2*%pi*a
vs=circum/T
printf("Velocity of Satellite is %f km/s\n",vs)
//Part2 Component of velocity towards the observer
D=re/a
vr=(vs*(re/a))
printf("Velocity of Satellite towards observer is %f km/s\n",vr)
//Part3 Doppler shift in received signal
VT=6354
lam=0.1132
Df=(VT/lam)/1000
disp(Df,'Doppler shift in kHz')
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