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.


Your Previous Searches
Random Picks

  • Circadian System: The circadian system is the internal biological clock that regulates the physiological and behavioral processes of living organisms, including humans, over a 24-hour period. In space and astronautical engineering context, the circadian syst ... Read More >>
  • Interstellar Gas: Interstellar gas refers to the gas and dust that exists in the space between stars in a galaxy. This gas is primarily composed of hydrogen and helium, with trace amounts of other elements. Interstellar gas is an important area of study in a ... Read More >>
  • Deformable Mirror: A deformable mirror is a type of mirror composed of an array of small, independently adjustable mirrors that can be used to correct for distortions in optical systems. In space and astronautical engineering, deformable mirrors are used in a ... Read More >>
Top News

Check out this interactive map of the early universe, considered largest ever cr...

A team of astronomers have put together the largest, most detailed map of the universe ever created – and you can explore it now....

News Source: USA Today on 2025-06-12

The Vera C. Rubin Observatory is about to totally transform astronomy...

With the ability to scan the entire southern night sky every three days, the huge Vera C. Rubin Observatory could be about to start solving the mysteries of the universe, from dark matter to Planet Ni...

News Source: New Scientist on 2025-06-12

Trump's proposed science cuts will have huge consequences...

The universe will still be there to marvel at, despite brutal cuts set to hit NASA and the National Science Foundation's budgets. But the damage to future research will be long-lasting, says Chanda Pr...

News Source: New Scientist on 2025-06-11

Starlink satellites are leaking radio signals that may ruin astronomy...

Our ability to study faint radio signals from when the first stars began to form is being threatened by SpaceX's Starlink satellites, which seem to be unintentionally leaking radio signals that overpo...

News Source: New Scientist on 2025-06-09

Asteroids around Venus pose possible 'invisible threat' to Earth: Should you be ...

A swarm of large asteroids likely lurking around Venus could one day pose an "invisible threat" to Earth if left unchecked, astronomers have warned....

News Source: USA Today on 2025-06-06