Patent US3922676A successfully refreshed from Google Patents.
US3922676A
Expired / Lapsed
US
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Signal sorting device
Assignee: United States Department of the Navy
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Filing: 1964-11-12
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Granted: 1975-11-25
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Expires: 1984-11-12
Abstract
Abstract 1. Radar signal processing equipment for indicating the presence of a radiating source having predetermined characteristics, comprising: A DIRECTIONAL ANTENNA ARRAY PROVIDING A PLURALITY OF OUTPUTS, EACH OUTPUT CORRESPONDING, WITHIN A GIVEN RESOLUTION, TO A PARTICULAR ANGULAR SEGMENT OF THE SPACE SCANNED BY THE ANTENNA ARRAY; A PLURALITY OF PROCESSING CHANNELS WHEREIN EACH OF THE PROCESSING CHANNELS IS CONNECTED TO ONE OF THE OUTPUTS FROM THE ANTENNA ARRAY; MEANS IN EACH PROCESSING CHANNEL TO PASS RADAR SIGNALS OF ONLY A PARTICULAR CARRIER FREQUENCY; PULSE WIDTH DETECTOR MEANS TO PASS DEMODULATED PULSE RADAR SIGNALS HAVING LESS THAN A PREDETERMINED PULSE WIDTH; MEANS CONNECTED TO THE PULSE WIDTH DETECTOR TO PASS SIGNALS HAVING ONLY THE PROPER REPETITION FREQUENCY; AND DWELL TIME DETECTOR MEANS RESPONSIVE TO A SUCCESSION OF PULSES APPEARING DURING A PREDETERMINED INTERVAL, AND TO AN ABSENCE OF PULSES DURING A SECOND PREDETERMINED INTERVAL, TO INDICATE THE EXISTENCE OF A SIGNAL SOURCE HAVING DESIRED CHARACTERISTICS.
Inventors
- 👤 William A O'berry
- 👤 Eugene R Fox
- 👤 Kenneth L Plante
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:47
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/021
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
153 words
Radar signal processing equipment for indicating the presence of a radiating source having predetermined characteristics, comprising: a directional antenna array providing a plurality of outputs, each output corresponding, within a given resolution, to a particular angular segment of the space scanned by the antenna array; a plurality of processing channels wherein each of the processing channels is connected to one of the outputs from the antenna array; means in each processing channel to pass radar signals of only a particular carrier frequency; pulse width detector means to pass demodulated pulse radar signals having less than a predetermined pulse width; means connected to the pulse width detector to pass signals having only the proper repetition frequency; and dwell time detector means responsive to a succession of pulses appearing during a predetermined interval, and to an absence of pulses during a second predetermined interval, to indicate the existence of a signal source having desired characteristics.
Claim 2
Dependent Claim
153 words
Radar signal processing equipment for indicating the presence of a radiating source having predetermined characteristics, comprising: a directional antenna array providing a plurality of outputs, each output corresponding, within a given resolution, to a particular angular segment of the space scanned by the antenna array; a plurality of processing channels wherein each of the processing channels is connected to one of the outputs from the antenna array; means in each processing channel to pass radar signals of only a particular carrier frequency; pulse width detector means to pass demodulated pulse radar signals having less than a predetermined pulse width; means connected to the pulse width detector to pass signals having only the proper repetition frequency; and dwell time detector means responsive to a succession of pulses appearing during a predetermined interval, and to an absence of pulses during a second predetermined interval, to indicate the existence of a signal source having desired characteristics.
Claim 3
Dependent Claim
179 words
The system of claim 1 wherein the carrier frequency filtering devices each comprise: means connected to each of the outputs of the directive antenna array to extract a portion of the pulse signal information and carrier signals appearing thereat, a variable band pass filter arrangement connected to all of said extracting means to block signals having undesired carrier frequencies, demodulating means connected to the variable filter to present the pulse signal information modulting the desired carrier frequency, and detector means in each channel connected to the output of the directional antenna array to present the pulse signal information modulating any carrier wave present at the input of the associated channel, coincidence means in each channel, one input thereof connected to the detector means in its respective channel, and the other input thereof connected to the detector means fed by the variable filter, whereby, upon coincidence of pulse information, at the desired frequency as determined by the variable filter, and a modulated signal of that frequency in any particular channel a signal will be provided by the appropriate coincidence means.
References Cited (Backward Citations)
US2941116A
Cited
US2859437A
Cited
US3185983A
Cited
US3383690A
Cited
US3369235A
Cited
US3714654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |