Importance

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Abstract

A very high frequency omni-range (VOR) receiver for use in aircraft radio-navigation, which provides an indication of course deviation that is substantially immune to effects such as reflections in transmitted VOR signals, transients occurring in an aircraft's electrical system and propeller and/or rotor modulations of an incoming VOR signal and the like which are all unrelated to actual course deviation, is disclosed. Specifically, in accordance with the invention, a stream of timing pulses is generated which are accurately phase-locked to a stream of pulses corresponding to a received reference signal transmitted from a desired VOR station. Both these streams are then used to produce an 'OBS' signal which is phase shifted by an amount representative of a preselected radial emitted by that station. Thereafter, the phase difference occurring between the OBS signal and a stream of pulses corresponding to a received variable signal transmitted by that same VOR station is determined and used to produce a deviation signal. The deviation signal has a value that represents any course deviation existing between the preselected radial and the present magnetic course of the aircraft with respect to the VOR station and is advantageously substantially unaffected by any effects other than actual course deviations.

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First Claim