Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1993-03-12
1994-04-19
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342404, 342443, G01S 144, G01S 504
Patent
active
053050100
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. The receiver phase synchronizes a signal from a 1.08 MHz crystal oscillator to a 30 Hz reference signal and a 30 Hz variable signal; both the reference and variable signals are received from a VOR ground station. As a result of the phase synchronization, the receiver produces timing pulses which are accurately phase synchronized to a synchronized reference pulse stream derived from the 30 Hz reference signal. Additionally, the receiver produces a synchronized variable pulse stream that is derived from the 30 Hz variable signal. The receiver produces, in response to the synchronized reference pulse stream and the timing pulses, a signal (henceforth referred to as the "OBS" signal) which is phase shifted by an amount representative of a selected radial emitted by that station. To facilitate determining deviations from the selected radial, the receiver determines any phase difference between the "OBS" signal and the synchronized variable pulse stream. This phase difference is used to produce a deviation signal having a value that represents any course deviations existing between the selected radial and a present magnetic course of the aircraft with respect to the VOR station.
REFERENCES:
patent: 2661467 (1953-12-01), Jones
patent: 3386096 (1968-05-01), Ludsfeen et al.
patent: 3495248 (1970-02-01), Raether et al.
patent: 3653047 (1972-03-01), Anthony
patent: 3787860 (1974-01-01), Greatline et al.
patent: 3800125 (1974-03-01), Cleary, Jr.
patent: 3838427 (1974-09-01), King, Jr. et al.
patent: 3845484 (1974-10-01), Sawicki
patent: 3919706 (1975-11-01), Grimm et al.
patent: 3968494 (1976-07-01), Freter
patent: 3988733 (1976-10-01), Kohler
patent: 4212067 (1980-07-01), Henderson
patent: 4604625 (1986-08-01), Davidson
George R. Sugar, "A VOR Audio frequency standard signal source based on digitial waveform synthesis", 1976 Conference on Precision Electromagnetic Measurements, Boulder, Colo. (Jun. 28-Jul. 1, 1976) pp. 72-74.
Clemens Wayne C.
Issing Gregory C.
Michaelson Peter L.
LandOfFree
Crystal oscillator synchronized digital very high frequency omni does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Crystal oscillator synchronized digital very high frequency omni, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crystal oscillator synchronized digital very high frequency omni will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-23034