Patent EP0032267A1 successfully refreshed from Google Patents.
US4196435A
Expired / Lapsed
US
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Radar pulse phase code system
Assignee: United States Department of the Air Force
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Filing: 1967-08-21
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Granted: 1980-04-01
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Expires: 1987-08-21
Abstract
Abstract A radar system for reducing the effective width of a transmitted pulse without increasing power utilizing coded phase shifting. Discrete parts of the transmitted pulse are phase shifted 180° and upon return to the receiver the pulse is decoded by a sequence of delay lines and phase shifters positioned in accordance with a predetermined code rendering all the discrete parts in phase which are then summed.
Inventors
- 👤 Calvert F. Phillips, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:11
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/26; G01S13/28; G01S13/284; G01S13/288
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
67 words
A radar apparatus for reducing the effective width of transmitted pulses comprising: a. encoder means for shifting certain discrete bits of the transmitted pulse by 180° in accordance with a predetermined code; b. and decoding means for adding all the discrete bits of the returned signal for target identification, the encoder means including: 1. a monostable multivibrator, 2. a variable delay circuit fed by the monostable multivibrator,
Claim 2
Dependent Claim
67 words
A radar apparatus for reducing the effective width of transmitted pulses comprising: a. encoder means for shifting certain discrete bits of the transmitted pulse by 180° in accordance with a predetermined code; b. and decoding means for adding all the discrete bits of the returned signal for target identification, the encoder means including: 1. a monostable multivibrator, 2. a variable delay circuit fed by the monostable multivibrator,
Claim 3
Dependent Claim
83 words
a first blocking oscillator activated by the output of the variable delay circuit, 4. a first switch driver controlled by the first blocking oscillator for pulse shaping, 5. a second delay circuit fed by the output of the variable delay circuit, 6. a second blocking oscillator activated by the output of the variable delay circuit and deactivated by the output of the first delay circuit, and 7. a second switch driver controlled by the output of the second blocking oscillator for phase shifting.
Claim 4
Dependent Claim
83 words
a first blocking oscillator activated by the output of the variable delay circuit, 4. a first switch driver controlled by the first blocking oscillator for pulse shaping, 5. a second delay circuit fed by the output of the variable delay circuit, 6. a second blocking oscillator activated by the output of the variable delay circuit and deactivated by the output of the first delay circuit, and 7. a second switch driver controlled by the output of the second blocking oscillator for phase shifting.
References Cited (Backward Citations)
US3366955A
Cited
US3371343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-01 | 1983-10-01 | 1984-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-01 | 1987-10-01 | 1988-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-01 | 1991-10-01 | 1992-04-01 | $7700.00 | Window Closed / Lapsed |