The function of an earth satellite station is to transmit and receive information frequency through microwave signals of a certain frequency. It has a large parabolic disc aerial. A communication satellite will amplify these microwave signals, convert them to another frequency and transmit them to other earth satellite stations. As the world becomes more sophisticated more modern communication methods and devices are introduced to the market.
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Geostationary Communication Satellites
The characteristics of a communication satellite are a) it orbits the Earth once every 24 hours b) it remains in the same spot above the Earth’s surface. It appears to be stationary in the sky. Hence transmitters and receivers on Earth do not need to move and track the satellite c) it orbits above the equatorial axis d) it orbits in the same direction and velocity as the earth and spins once in its axis. The world communication network uses at least three geostationary communication satellites.
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The Advantages of Satellites Communication
The advantages of using satellites for communication are as follows: a) the microwaves of used to carry information are not affected by the change of weather or hilly Earth surfaces b) only a small amount of energy is lost when the microwaves pass through the atmosphere c) more information can be transmitted compared to using metal cables d) the transmission covers a wide area, even in remote areas that have no communication lines e) live telecasts of some events can be broadcast simultaneously to various parts of the world.
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Other than communication, satellite are also used to: a) forecast weather conditions b) study and take photographs of structure on the surface of the Earth c) determine the position of objects such as ships, planes or vehicles on land d) carry out researches on celestial objects. Weather satellites photograph the Earth regularly in visible and infrared light. They provide data to weather stations on the Earth, thus enabling the forecast of weather conditions around the world.