US3634859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moving target indicator with automatic clutter residue control
Assignee: United States Department of the Air Force
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Filing: 1967-08-08
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Granted: 1972-01-11
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Expires: 1987-08-08
Abstract
Abstract A radar system for eliminating effects of varying backgrounds in combination with an MTI. The output of a phase detector with an IF input is fed to an MTI canceller producing a video signal which is fed to a logarithmic amplifier followed by a high-pass FTC filter and then an antilog device.
Inventors
- 👤 Joachim E Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:27
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/522; G01S13/524; G01S13/5246
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
88 words
A radar system for detecting moving targets and eliminating effects of varying background comprising: a. a phase detector having an IF input with a noise and clutter residue component; b. a MTI cancelling system fed by the phase detector and having an output signal; c. means for automatically adjusting the clutter residue to be equal to the noise level, the adjusting means including a logarithmic amplifier and a high pass filter fed by the logarithmic amplifier; d. and means for compensating for the nonlinearily of the adjusting means.
Claim 2
Dependent Claim
88 words
A radar system for detecting moving targets and eliminating effects of varying background comprising: a. a phase detector having an IF input with a noise and clutter residue component; b. a MTI cancelling system fed by the phase detector and having an output signal; c. means for automatically adjusting the clutter residue to be equal to the noise level, the adjusting means including a logarithmic amplifier and a high pass filter fed by the logarithmic amplifier; d. and means for compensating for the nonlinearily of the adjusting means.
Claim 3
Dependent Claim
28 words
A system for detecting moving targets and eliminating effects of varying background according to claim 1 wherein the high pass filter is of the fast time constant type.
References Cited (Backward Citations)
US3343162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |