Topic: Satellite Communication
A signal transmitted from an Earth station bounces back from a geostationary satellite, with an altitude of 35864 km from the Earth surface. The range from the Earth station is 38200 km. The round trip time is about: (excluding processing delays and assuming c = 3 x 10^8m/s)
- A. 255 ms
- B. 127 ms
- C. 239 ms
- D. 120 ms
Answer: A. 255 ms
Explanation: Altitude (h) = 35864 km, C = 3 x 10^8 m/s, Range = 38200 km. As, T = Round-trip distance / Speed = (2 x 38200 km) / (3 x 10^8 m/s) = 255 ms.