VHF Omnidirectional Range
VHF Omnidirectional Range (VOR) is a type of short-range radio navigation system for aircraft, 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 the VOR system, the azimuth is determined by the phase difference between a reference signal and a variable signal. A VOR ground station sends out an omnidirectional master signal, and a highly directional second signal is modulated by a rotating beacon. The phase difference between these two signals corresponds to the azimuth, allowing the receiving equipment to fix a bearing from the station to the aircraft, enabling the pilot to determine their direction of flight.
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