US3725933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method of smoothing navigation signals
Assignee: Butler National Corp
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Filing: 1970-09-11
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Granted: 1973-04-03
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Expires: 1990-09-11
Abstract
Abstract It is desirable to smooth the radio signals used in aircraft navigation so that maximum accuracy can be obtained in the control and operation of aircraft. The present invention provides for smoothing VOR bearing radio signals by limiting the maximum excursions which the signal can take in view of the axial parameters of the system and to adjust the maximum response with an integrator when necessary.
Inventors
- 👤 E Perkins
- 👤 J Hobbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:01
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A VOR navigation receiver including means for detecting variable and reference signals comprising: a phase shifter receiving said reference signals; phase discriminating means receiving said variable signal and said reference signal after it passes through said phase shifter; a variable time constant integrator receiving the output of said phase discriminating means; a servo motor connected to the output of said integrator and having an output shaft connected to said phase shifter; a synchro differential connected to the output shaft of said servo motor; a compass connected to said synchro differential; an indicator connected to the output of said synchro differential; and a rectifier connected to an output of said synchro differential and said rectifier connected to said variable time constant integrator to vary its time constant.
Claim 2
Dependent Claim
126 words
A VOR navigation receiver including means for detecting variable and reference signals comprising: a phase shifter receiving said reference signals; phase discriminating means receiving said variable signal and said reference signal after it passes through said phase shifter; a variable time constant integrator receiving the output of said phase discriminating means; a servo motor connected to the output of said integrator and having an output shaft connected to said phase shifter; a synchro differential connected to the output shaft of said servo motor; a compass connected to said synchro differential; an indicator connected to the output of said synchro differential; and a rectifier connected to an output of said synchro differential and said rectifier connected to said variable time constant integrator to vary its time constant.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |