Very High Frequency Omnidirectional Range

In the context of aerospace engineering, Very High Frequency Omnidirectional Range (VOR) is a type of short-range radio navigation system that enables 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 propagated by a phased antenna array and rotates clockwise in space 30 times a second. This signal pattern is called a 30 Hz sinusoidal frequency modulation. By comparing the phase of the directional signal with the master, the angle (bearing) to the aircraft from the station can be determined.
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