What is the main underlying operating principle of the Very-high-frequency Omnidirectional Range (VOR) aircraft navigational system?
A definite amount of time is required to send and receive a radio signal.
The difference between the peak values of two DC voltages may be used to determine an aircraft’s altitude above a selected VOR station.
A phase difference between two AC voltages may be used to determine an aircraft’s azimuth position in relation to a selected VOR station.
A phase difference between two AC voltages may be used to determine an aircraft’s distance from a selected VOR station.
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