VOR – VHF Omnidirectional Range VOR General InformationĪll VOR stations take 000 degrees as a reference for magnetic north. Thus, both radial tracking and distance information are provided. VOR devices are mostly used together with the DME (VOR/DME), which indicates the distance to the station, and the frequency selected for the VOR is also connected to the DME station. The VOR system works with the Line of Sight (LoS) principle due to the characteristic of the VHF band, in other words, there should be no obstacle between the VOR station and the air platform, and they should be in direct sight of each other. The phase difference between the two aforementioned 30 Hz signals gives the angle of the aircraft relative to the ground station. The ground station also broadcasts an FM modulated signal into space on a 30 Hz reference mark in all directions. This signal generates a 30 Hz sinusoidal wave at the VOR receiver on the aircraft. The ground station emits an electromagnetic pattern of 30 cycles/second. The VOR operates in the 108 – 117.95 MHz band with 50 kHz channel steps. This term is formed from the initials of the words “Very High Frequency Omnidirectional Radio Range”. VOR is in the category of avionics systems. VOR (full name: VHF Omni-directional Radio Range) is an air navigation radio aid that performs phase comparison of ground-broadcast signals to indicate direction in aviation.
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