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In telecommunication, the use of artificial satellites to provide communications links between various points on earth. Ommunications satellites relay voice, video, and data signals between widely separated fixed locations (e. G. Between the switching offices of two different national telephone networks), between a fixed location and numerous small fixed or mobile receivers in a designated area (e. G. Direct satellite broadcasting of television programming), and between individual mobile users (e. G. Aircraft, ships, motor vehicles, and personal handheld units). The technique involves transmitting signals from an earth station to a satellite. Equipment onboard the satellite receives the signals, amplifies them, and retransmits them to a region of earth.
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