Patent US3689922A successfully refreshed from Google Patents.
US3689922A
Expired / Lapsed
US
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Radar system logic circuit
Assignee: United States Department of the Air Force
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Filing: 1966-03-23
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Granted: 1972-09-05
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Expires: 1986-03-23
Abstract
Abstract A dual frequency radar system that automatically switches from a resistive mixer of two receiving channels to a peak value selector. The switching is determined by the presence of signals in each channel above a given threshold.
Inventors
- 👤 Calvert F Phillips Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:15
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/42
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
74 words
A dual frequency radar system employing a Constant False Alarm Rate comprising: a. a first and second receiver; b. a resistive mixer fed by the first and second receivers; c. a peak value selector fed by the first and second receivers; d. an electronic switch connecting alternately the outputs of the peak value selector and the resistive mixer; e. and an ''''AND'''' gate fed by the first and second receivers activating the electronic switch.
Claim 2
Dependent Claim
74 words
A dual frequency radar system employing a Constant False Alarm Rate comprising: a. a first and second receiver; b. a resistive mixer fed by the first and second receivers; c. a peak value selector fed by the first and second receivers; d. an electronic switch connecting alternately the outputs of the peak value selector and the resistive mixer; e. and an ''''AND'''' gate fed by the first and second receivers activating the electronic switch.
Claim 3
Dependent Claim
57 words
A dual frequency radar system according to claim 1 which further includes: a. base line clippers interposed between the first and second receivers and the ''''AND'''' gate; b. a first delay line interposed between the resistive mixer and the electronic switch; c. and a second delay line interposed between the peak value selector and the electronic switch.
Claim 4
Dependent Claim
60 words
A dual frequency radar system employing a Constant False Alarm Rate comprising: a. a first and second receiver; b. a resistive mixer fed by the first and second receivers; c. a first peak value selector fed by the first and second receivers; d. and a second peak value selector fed by the resistive mixer and the first peak value selector.
Claim 5
Dependent Claim
60 words
A dual frequency radar system employing a Constant False Alarm Rate comprising: a. a first and second receiver; b. a resistive mixer fed by the first and second receivers; c. a first peak value selector fed by the first and second receivers; d. and a second peak value selector fed by the resistive mixer and the first peak value selector.
References Cited (Backward Citations)
US3403394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |