The Global Positioning System satellites operate at an altitude of 20,200 km and use communication frequencies of 1575.42 MHz. Find the gravitational frequency change with respect to Earth.

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The Global Positioning System satellites operate at an altitude of 20,200 km and use communication frequencies of 1575.42 MHz. Find the gravitational frequency change with respect to Earth.

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Step 1

Given data, h=20,200 (km);

frequency, f=1575.42 (MHz);

So, with respect to earth gravitational frequency change for an altitude h is given by the equation;

f=-GMc21R+h-1Rf................................1

also for the above equation, we know the value of some constants as;

Gravitational constant,  G=6.67×10-11 Nm2/kg2;

Mass of the Earth,  M=5.976×1024 kg

The radius of the Earth,   R=6.37×106 m

The velocity of light,  c=3×108 m/s

now putting all the value in the equation (1) we get;

f=-GMc21R+h-1Rff=-6.67×10-11 Nm2/kg2×5.976×1024 kg3×108 m/s216.37×106 m+20200 km-16.37×106 m1575.42 MHz=0.00346 Hz

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