Input Signals For A Variable Reference Velocity Download Scientific The vor works on a similar principle to that of the light house, however vor has two signals, which are 30 hz sine waves modulated onto the vhf carrier, one is called the reference signal and other is called the variable signal. Every vor is oriented to magnetic north (more on this in a bit), and emits 360 radials from the station. the vor sends out one stationary master signal, and one rotating variable signal. these are also called "reference" and "variable" phases.
Rotor Modulation Of Vor Signals Vertical Flight Library Store Instead of light signals, the vor beacon transmits two vhf radio signals from the same facility. one of these signals, analogous to the white light, called the reference phase, is omni directional and radiates from the station in a circular pattern. Vor, short for vhf omnidirectional radio range, is a type of radio navigation system for aircraft, enabling them to find their position and stay on course by receiving radio signals emitted by a network of radio beacons. it uses frequencies in very high frequency (vhf) from 108 to 117.95 mhz. Reference phase signal – sent in all directions. variable phase signal – rotates 30 times per second, creating a difference in phase depending on the aircraft’s position. the aircraft’s vor receiver compares these signals and calculates the aircraft’s bearing (radial) from the vor station. Vor ground station is aligned with magnetic north. it emits two signals: when an aircraft receives those signals, its receiver compares those and a measures the phase difference.
Radio Navigation Why Is The Vor Reference And Variable Signal Reference phase signal – sent in all directions. variable phase signal – rotates 30 times per second, creating a difference in phase depending on the aircraft’s position. the aircraft’s vor receiver compares these signals and calculates the aircraft’s bearing (radial) from the vor station. Vor ground station is aligned with magnetic north. it emits two signals: when an aircraft receives those signals, its receiver compares those and a measures the phase difference. The system works by transmitting two signals a reference signal and a variable signal that rotates. the aircraft receiver compares the phase difference between the signals to determine the radial, or bearing, from the station. The aircraft’s radial is determined by measuring the phase difference between two signals transmitted by the ground station: the reference phase signal (r) and the variable phase signal (v). The vor is a short range radio navigation aid that produces an infinite number of bearings that may be visualized as lines radiating from the beacon. the phase of the variable signal lags that of the reference signal by an amount equal to the azimuth angle around the beacon. Vor navigation relies on an ingenious dual signal system that allows aircraft to determine their precise position relative to the ground station. each vor transmitter broadcasts two distinct vhf signals simultaneously: a reference phase signal and a variable phase signal.
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