US3889265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Station distinguishing system in omega receiver
Assignee: Furuno Electric Co Ltd
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Filing: 1974-04-12
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Granted: 1975-06-10
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Expires: 1994-04-12
Abstract
Abstract A station distinguishing system for an omega navigation system which includes signal receiving means, measuring the duration of each received signal and selecting the signals having durations corresponding to the duration of a selected station, generating wave forms of durations corresonding to the durations of the signals of the transmitting stations, and a confirming device for confirming that a signal produced by the generating means corresponds in time and duration to the selected station thus distinguishing the desired signal from the signals produced by the selecting means.
Inventors
- 👤 Hideki Tanaka
- 👤 Kazutaka Ishida
- 👤 Mikio Watanabe
- 👤 Mitsuhiro Inouchi
- 👤 Shigeru Yoshioka
- 👤 Minoru Handa
- 👤 Asao Kitabatake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:12
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/04; G01S1/045; G01S1/08; G01S1/20; G01S1/30; G01S1/308
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
A station distinguishing system for selecting a signal of a required transmitting station from the omega signals transmitted by the omega transmitting stations in time division fashion, comprising means for receiving said omega signals and producing a first train of envelope waveforms of said omega signals in the order of reception, means for selecting a pair of envelope waveforms having a duration corresponding to said required station out of said envelope waveforms and producing a pair of selection signals corresponding to said pair of envelope waveforms, and means for distinguishing one of said selection signals which corresponds to said required station and producing a reference signal which corresponds to said required station.
Claim 2
Dependent Claim
112 words
A station distinguishing system for selecting a signal of a required transmitting station from the omega signals transmitted by the omega transmitting stations in time division fashion, comprising means for receiving said omega signals and producing a first train of envelope waveforms of said omega signals in the order of reception, means for selecting a pair of envelope waveforms having a duration corresponding to said required station out of said envelope waveforms and producing a pair of selection signals corresponding to said pair of envelope waveforms, and means for distinguishing one of said selection signals which corresponds to said required station and producing a reference signal which corresponds to said required station.
Claim 3
Dependent Claim
64 words
The system according to claim 1, wherein said means for selecting a pair of envelope wavefroms includes a counting unit for counting clock pulses for the durations of said envelope waveforms and producing outputs representing said durations and gating means for passing one of said outputs which represent the duration of said required station based upon a coded signal corresponding to said required station.
Claim 4
Dependent Claim
143 words
The system according to claim 1, wherein said means for distinguishing said selection signals includes a counting unit for counting clock pulses from the starting time of one of said selection Signals for a time corresponding to the time interval between said pair of envelope waveforms having the same duration and producing a distinction signal at the time of the other selection signal, gating means for blocking said other selection signal in response to said distinction signal, thereby causing the counting operation of said counting unit to be initiated only at the time of said one selection signal, said counting unit also producing an interval signal after a lapse of time corresponding to the transmission interval of the each transmitting station, and means for comparing said interval signal with said selection signals and producing said reference signal when a coincidence is obtained therebetween.
Claim 5
Dependent Claim
56 words
The system according to claim 1, wherein said system further comprises means for producing a second train of envelope waveforms corresponding respectively to said first train of envelope waveforms based upon said reference signal, said second train of waveforms appearing in the same order as said first train of waveforms and starting from said required station.
Claim 6
Dependent Claim
63 words
The system according to claim 4, wherein said means for producing a second train of envelope waveforms includes a counting unit for counting clock pulses in response to said reference signal and producing outputs corresponding to the durations of said envelope waveforms, and means for gating said outputs in the order of stations received, under control of the coded signals of said stations.
Claim 7
Dependent Claim
61 words
The system according to claim 4, wherein said system further comprises means for confirming that a waveform of an arbitrary station in said second train of envelope waveforms appears in coincidence in time with a waveform in said first train of envelope waveforms which has the same duration as the envelope waveform of said arbitrary station and producing a confirmation signal.
References Cited (Backward Citations)
US3069504A
Cited
US3761932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |