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Electric beacon
In navigation, an electric beacon is a kind of beacon, a device which marks a fixed location and allows direction finding equipment to find relative bearing, the direction to the beacon. The most common are radio beacons, which broadcast a radio signal which is picked up by radio direction finding systems on ships, aircraft and vehicles to determine the bearing to the beacon, but the term also covers infrared and sonar beacons.
== Radio beacons ==
A radio beacon is a transmitter at a known location, which transmits a continuous or periodic radio signal with limited information content (for example its identification or location), on a specified radio frequency. Occasionally the beacon function is combined with some other transmission, like telemetry data or meteorological information.
Radio beacons have many applications, including air and sea navigation, propagation research, robotic mapping, radio-frequency identification (RFID) and indoor guidance as with real-time locating systems (RTLS) like Syledis.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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