VOR (VHF Omnidirectional Range)
VOR, or VHF Omnidirectional Range, is a type of short-range radio navigation system used in aviation, enabling aircraft with a receiving unit to determine their position and stay on course by receiving radio signals transmitted by a network of fixed ground radio beacons. It uses frequencies in the very high frequency (VHF) band from 108 to 117.95 MHz. Developed in the United States beginning in 1937 and deployed by 1946, VOR is the standard air navigational system in the world, used by both commercial and general aviation. In a VOR system, the ground station sends out an omnidirectional master signal, and a highly directional second signal is sent out on a rotating basis. The phase difference between these two signals as received by the aircraft gives the bearing relative to the ground station, which can be used for navigation. The system is reliable and provides good accuracy, especially for line of sight operations.
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