Patent US3671964A successfully refreshed from Google Patents.
US3671964A
Expired / Lapsed
US
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Automatic radar detection device
Assignee: United States Department of the Navy
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Filing: 1970-10-30
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Granted: 1972-06-20
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Expires: 1990-10-30
Abstract
Abstract A shipborne detector for indicating the presence or absence of ''''search-lighting'''' or continuous observation by hostile pulsed tracking radars wherein presence is indicated if the pulse rate of incoming radar pulses exceeds a selectively predetermined rate whereby a radar display is automatically activated and automatically blanked if the pulse rate does not exceed the predetermined rate.
Inventors
- 👤 Andrew J Trochanowski
- 👤 Steven A Wicks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:16
CPC Classifications
H; H04; H04K; H04K3/00; H04K3/80; H04K3/82; H04K3/822; G; G01; G01S; G01S7/00; G01S7/02; G01S7/38; H04K2203/00; H04K2203/10; H04K2203/22; H04K2203/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
Apparatus for selectively energizing an EW display device whereby hostile radar pulses are displayed only when said pulses are received at a selectively predetermined pulse rate, said apparatus comprising: directional antenna means for receiving and detecting said radar pulses; pulse rate counter means connected to said antenna means for repetitively counting the number of radar pulses received during a fixed time period whereby said counter means produce a true output if a selectively predetermined number of radar pulses are received and a false output if less than said number are received; and, switching means connected to said pulse rate counter means and being responsive to said true output to thereby energize said display device and to said false output to thereby blank said display device.
Claim 2
Dependent Claim
125 words
Apparatus for selectively energizing an EW display device whereby hostile radar pulses are displayed only when said pulses are received at a selectively predetermined pulse rate, said apparatus comprising: directional antenna means for receiving and detecting said radar pulses; pulse rate counter means connected to said antenna means for repetitively counting the number of radar pulses received during a fixed time period whereby said counter means produce a true output if a selectively predetermined number of radar pulses are received and a false output if less than said number are received; and, switching means connected to said pulse rate counter means and being responsive to said true output to thereby energize said display device and to said false output to thereby blank said display device.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1 wherein said pulse rate counter means include binary counter means and timer means.
Claim 4
Dependent Claim
17 words
The apparatus of claim 1 wherein said switching means include storage flip-flop means and relay control means.
Claim 5
Dependent Claim
174 words
A radar detector for automatically indicating on an EW display device the presence of search-lighting by hostile tracking radars comprising: directional antenna means for receiving radar pulses transmitted by said hostile radars; binary counter means connected to said antenna means for counting said radar pulses; timer means connected to said counter means; said counter means being responsive to periodic timing signals from said timer means to thereby periodically count the number of said radar pulses received during a fixed time period; whereby said counter means produce a true output only if a selectively predetermined radar pulse count is achieved or exceeded during said time period and produce a false output if said predetermined radar pulse count is not achieved during said time period; switch means connected to said counter means and to said display device; said switch means being responsive to said true output to energize said display device whereby received radar pulses are displayed and being responsive to said false output to blank said display device whereby no received radar signals are displayed.
Claim 6
Dependent Claim
174 words
A radar detector for automatically indicating on an EW display device the presence of search-lighting by hostile tracking radars comprising: directional antenna means for receiving radar pulses transmitted by said hostile radars; binary counter means connected to said antenna means for counting said radar pulses; timer means connected to said counter means; said counter means being responsive to periodic timing signals from said timer means to thereby periodically count the number of said radar pulses received during a fixed time period; whereby said counter means produce a true output only if a selectively predetermined radar pulse count is achieved or exceeded during said time period and produce a false output if said predetermined radar pulse count is not achieved during said time period; switch means connected to said counter means and to said display device; said switch means being responsive to said true output to energize said display device whereby received radar pulses are displayed and being responsive to said false output to blank said display device whereby no received radar signals are displayed.
References Cited (Backward Citations)
US2522551A
Cited
US3500401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |