Patent US4003053A successfully refreshed from Google Patents.
US4003053A
Expired / Lapsed
US
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Target adaptive radar system
Assignee: United States Department of the Navy
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Filing: 1966-12-16
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Granted: 1977-01-11
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Expires: 1986-12-16
Abstract
Abstract A radar system transmitting a signal of given carrier frequency which is quency modulated at a given rate and wherein the nature of the target return is utilized to eliminate sea and ground clutter. The reflected signal from a hard target has a unique modulation imposed on it by the interference of the incident and reflected waves and this unique modulation is converted to the modulated voltage thereby permitting the use of a video amplifier having a narrow bandwidth.
Inventors
- 👤 Clare L. Mengel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:10
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/292; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/34; G01S13/342
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
217 words
A target adaptive frequency modulated radar system utilizing a target modulated signal produced by the combining interference of a coherent target reflected wave with a transmitted incident wave for reducing the effects of sea and ground clutter comprising: means for transmitting a signal of given carrier frequency which is transmitter modulated plus and minus a given frequency value at a given rate for reflection from a coherent target, to produce a target modulated signal indicative of said coherent target by the combining interference of the transmitted incident signal with the reflected signal from said coherent target; means for recovering said target modulated signal indicative of said coherent target, said recovered target modulated signal being comprised of said transmitter modulated given carrier frequency and frequency modulation produced by the combining of said incident signal with said reflected signal from said coherent target; means for separating said given carrier frequency from said recovered target modulated signal; a narrow band video amplifier connected to said means for separating said given carrier frequency from said recovered target modulated signal, for passing and amplifying only the remaining portion of said target modulation signal; a coherent detector and an envelope detector connected to the output of said narrow band video amplifier; and utilization means actuated by said coherent detector and said envelope detector.
Claim 2
Dependent Claim
217 words
A target adaptive frequency modulated radar system utilizing a target modulated signal produced by the combining interference of a coherent target reflected wave with a transmitted incident wave for reducing the effects of sea and ground clutter comprising: means for transmitting a signal of given carrier frequency which is transmitter modulated plus and minus a given frequency value at a given rate for reflection from a coherent target, to produce a target modulated signal indicative of said coherent target by the combining interference of the transmitted incident signal with the reflected signal from said coherent target; means for recovering said target modulated signal indicative of said coherent target, said recovered target modulated signal being comprised of said transmitter modulated given carrier frequency and frequency modulation produced by the combining of said incident signal with said reflected signal from said coherent target; means for separating said given carrier frequency from said recovered target modulated signal; a narrow band video amplifier connected to said means for separating said given carrier frequency from said recovered target modulated signal, for passing and amplifying only the remaining portion of said target modulation signal; a coherent detector and an envelope detector connected to the output of said narrow band video amplifier; and utilization means actuated by said coherent detector and said envelope detector.
Claim 3
Dependent Claim
63 words
A target adaptive frequency modulated radar system utilizing a target modulated signal produced by the combining interference of a coherent target reflected wave with a transmitted incident wave for reducing the effects of sea and ground clutter as set forth in claim 1 wherein, said means for separating said given carrier frequency from said recovered target modulated signal comprises a square law detector.
Claim 4
Dependent Claim
75 words
A target adaptive frequency modulated radar system utilizing a target modulated signal produced by the combining interference of a coherent target reflected wave with a transmitted incident wave for reducing the effects of sea and ground clutter as set forth in claim 1 wherein said means for separating said given carrier frequency from said recovered target modulated signal comprises a mixer and wherein said carrier frequency is fed into said mixer from said transmitting means.
References Cited (Backward Citations)
US3274595A
Cited
US3197773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |