US3733603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar target identification system
Assignee: United States Department of the Army
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Filing: 1968-07-31
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Granted: 1973-05-15
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Expires: 1988-07-31
Abstract
Abstract This system utilizes the low frequency modulations of the signal from a radar which result from target scintillation and target motion. Outputs are provided for three types of identification aural, frequency meter, and automatic recognition computer. A frequency multiplier may be used with the aural and frequency meter outputs.
Inventors
- 👤 S Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:18
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/41; G01S7/411
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A radar target identification system including means for illuminating a target with radar energy, receiving echos having subaudible frequency components from said target, and providing an output indicative of the variation of the amplitude of said echos; and recognition meAns for identifying said subaudible frequency components connected to and responsive to said output wherein said recognition means includes a band-pass filter connected to said output; frequency sensitive means; and frequency multiplier means connected between said filter and said frequency sensitive means.
Claim 2
Dependent Claim
81 words
A radar target identification system including means for illuminating a target with radar energy, receiving echos having subaudible frequency components from said target, and providing an output indicative of the variation of the amplitude of said echos; and recognition meAns for identifying said subaudible frequency components connected to and responsive to said output wherein said recognition means includes a band-pass filter connected to said output; frequency sensitive means; and frequency multiplier means connected between said filter and said frequency sensitive means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |