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Satellite Propagation Time Problem
Given the geostationary satellite diagram in Figure 2, calculate the maximum and minimum range in kilometers from an Earth
Station to a satellite in geosynchronous orbit. What is the round-trip data signal propagation time for both maximum and
minimum ranges calculated?
Solution:
a) Calculated geosynchronous satellite ranges:
θmax = cos-1(re / rs)
θmax = cos-1(6370km / 42,242km) = 81.33 deg
And:
rmin = rs - re = 35,872km
rmax = rs sin (θmax) = 41,759km
b) Round trip data transmission signal propagation time:
Tmin = 2 (rmin) / c = 2 (35,872km) / 3E5km/s = 0.239s
Tmax = 2 (rmax) / c = 2 (41,759km) / 3E5km/s = 0.278s
Satellite key words: geosynchronous orbit, RF signal, GEO, data transmission, transceiver, electromagnetic signal
propagation time, orbital parameters, range, kilometers, earth station, ES, attenuation, atmospheric.
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