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Digital Communication Systems
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Digital Communication Systems GPS (Global Positioning System): is a communications network consisting of 24 satellites orbiting the Earth at an altitude of about 17600km, it allows people to find the approximate whereabouts and coordinates of their location with GPS receivers. The satellites are in constant contact with radar communication stations on Earth. These radio communication stations inform the satellites of their exact location with respect to the Earth’s surface. All the GPS satellites are equipped with precisely accurate atomic clocks; this allows all radio signals have information about the time it was sent.
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