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Patent US4074267A successfully refreshed from Google Patents.
US4074267A
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Device for numerically displaying vor bearing
Assignee: United States Department of the Navy
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Filing: 1976-05-17
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Granted: 1978-02-14
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Expires: 1996-05-17
Abstract
Abstract A digital numeric VHF omnidirectional range (VOR) bearing indicator for piding a stable digital readout of VOR bearing in the presence of noise and fading signals. The device utilizes a count averaging scheme for calculating VOR bearing over a plurality of cycles. High quality filtering is also achieved by the use of phase lock loops which are used to generate low noise digital signals having a phase which matches reference and variation signals, representing VOR bearing. An exclusive "OR" gate is used to compare the reference and variation signals, after they are divided in frequency, to produce a composite signal which has a duration indicative of VOR bearing. The composite signal is then clocked, counted and averaged over a number of intervals and fed to a digital display device.
Inventors
- 👤 Sidney G. Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:46
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/04; G01S1/047; G01S1/08; G01S1/44; G01S1/46; G01S1/50
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
111 words
A device for numerically displaying an indication of VOR bearing comprising: a. means for detecting reference and variation signals from a VOR bearing signal; b. phase lock loop means for rejecting noise from said reference and variation signals; c. means for frequency dividing said reference and variation signals by a factor of two; d. an exclusive "OR" gate responsive to said means for frequency dividing for producing a composite signal whenever said reference and variation signals exist in opposing logic states; e. means for detecting duration of said composite signal; f. means for numerically displaying a signal indicative of said VOR bearing in response to said duration of said composite signal.
Claim 2
Independent Claim
111 words
A device for numerically displaying an indication of VOR bearing comprising: a. means for detecting reference and variation signals from a VOR bearing signal; b. phase lock loop means for rejecting noise from said reference and variation signals; c. means for frequency dividing said reference and variation signals by a factor of two; d. an exclusive "OR" gate responsive to said means for frequency dividing for producing a composite signal whenever said reference and variation signals exist in opposing logic states; e. means for detecting duration of said composite signal; f. means for numerically displaying a signal indicative of said VOR bearing in response to said duration of said composite signal.
Claim 3
Dependent Claim
62 words
The device of claim 1 wherein said phase lock loop means comprises: a. a first phase lock loop coupled to receive said variation signal; b. a second phase lock loop coupled to receive said reference signal, said second phase lock loop comprising voltage controlled oscillator means for producing one degree clock output pulses, a frequency divider, a flip-flop, and a phase detector.
Claim 4
Dependent Claim
42 words
The device of claim 1 wherein said means for detecting duration of said composite signal comprises logic gating means for producing a series of output pulses representative of VOR bearing in degrees: means for counting said output pulses representative of VOR bearing.
Claim 5
Dependent Claim
31 words
The device of claim 1 wherein said means for detecting duration of said composite signal comprises means for determining an average duration of a plurality of intervals of said composite signal.
Claim 6
Dependent Claim
60 words
The device of claim 4 wherein said means for determining an average duration of a plurality of intervals of said composite signal comprises: a. interval counter means for producing a load signal upon accumulating a predetermined number of intervals; b. prescaler counter means for producing an output signal upon accumulating a predetermined number of duration pulses from said composite signal.
Claim 7
Independent Claim
134 words
A device for numerically indicating bearing from a VOR bearing signal comprising: a. means for detecting a reference signal from said VOR bearing signal; b. means for detecting a variation signal from said VOR bearing signal; c. means for producing a first low noise oscillator signal in response to said reference signal having the same phase as said reference signal; d. means for producing a second low noise oscillator signal in response to said variation signal having the same phase as said reference signal; e. an exclusive "OR" gate for comparing said first and second low noise oscillator signals to produce a composite signal whenever said first and second low noise oscillator signals exist in opposing logic states; means for detecting average duration of a plurality of composite signal intervals to numerically indicate bearing.
Claim 8
Independent Claim
134 words
A device for numerically indicating bearing from a VOR bearing signal comprising: a. means for detecting a reference signal from said VOR bearing signal; b. means for detecting a variation signal from said VOR bearing signal; c. means for producing a first low noise oscillator signal in response to said reference signal having the same phase as said reference signal; d. means for producing a second low noise oscillator signal in response to said variation signal having the same phase as said reference signal; e. an exclusive "OR" gate for comparing said first and second low noise oscillator signals to produce a composite signal whenever said first and second low noise oscillator signals exist in opposing logic states; means for detecting average duration of a plurality of composite signal intervals to numerically indicate bearing.
Claim 9
Dependent Claim
85 words
The device of claim 6 wherein said means for producing a first low noise oscillator signal comprises: a. voltage controlled oscillation means for producing a series of clock pulses representative of a predetermined amount of angular displacement; b. frequency divider means for reproducing said reference signal from said series of clock pulses; and c. phase detector means for adjusting said series of clock pulses in phase such that said reference signal reproduced by said frequency divider means has a phase which matches said reference signal.
Claim 10
Dependent Claim
102 words
The device of claim 6 wherein said means for detecting average duration of a plurality of composite signal intervals comprises: a. logic means for gating said composite signal by a series of clock pulses representative of a predetermined amount of angular displacement; b. means for counting signals from said logic means and producing a prescaler output signal upon accumulating a predetermined number of said gated signals; c. interval counter means for resetting said means for counting gated signals from said logic means to obtain a count in said interval counter means indicative of average duration of a plurality of composite signal intervals.
Claim 11
Dependent Claim
50 words
The device of claim 8 further comprising: a. binary coded decimal counters for accumulating said prescaler output signals; b. numeric display means activated in response to a load signal produced by said interval counter for reading out a digital number from said binary coded decimal counters indicative of said bearing.
Claim 12
Independent Claim
77 words
A device for numerically indicating bearing from a VOR bearing signal comprising: a. means for detecting reference and variation signals from said VOR bearing signal; b. means for frequency dividing said reference and variation signals; c. an exclusive "OR" gate for comparing said reference and variation signals to produce a composite signal whenever said reference and variation signals exist in opposing logic states; and d. means for detecting duration of said composite signal to numerically indicate bearing.
Claim 13
Independent Claim
77 words
A device for numerically indicating bearing from a VOR bearing signal comprising: a. means for detecting reference and variation signals from said VOR bearing signal; b. means for frequency dividing said reference and variation signals; c. an exclusive "OR" gate for comparing said reference and variation signals to produce a composite signal whenever said reference and variation signals exist in opposing logic states; and d. means for detecting duration of said composite signal to numerically indicate bearing.
Claim 14
Dependent Claim
28 words
The device of claim 10 wherein said means for detecting duration of said composite signal comprises means for detecting average duration of a plurality of composite signal intervals.
Claim 15
Dependent Claim
103 words
The device of claim 11 wherein said means for detecting average duration of a plurality of composite signal intervals comprises: a. logic means for gating said composite signal by a series of clock pulses representative of a predetermined amount of angular displacement; b. means for counting gated signals from said logic means and producing a prescaler output signal upon accumulating a predetermined number of said gated signals; c. interval counter means for resetting said means for counting gated signals from said logic means to obtain a count in said interval counter means indicative of average duration of a plurality of composite signal intervals.
References Cited (Backward Citations)
US3386096A
Cited
US3919706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |