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US3787850A
Expired / Lapsed
US
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Airborne analog moving target detector
Assignee: United States Department of the Air Force
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Filing: 1972-11-07
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Granted: 1974-01-22
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Expires: 1992-11-07
Abstract
Abstract An analog moving target detector in which the transmitter feeds inputs to a Butler matrix connecting a series of antennas. On reception the received signals are fed to a plurality of series of scaling circuits, each series corresponding to one antenna. Corresponding circuits of each series are then summed, fed to intermediate frequency mixers, followed by box car circuits. The output of the box car circuits are fed to selected doppler filters and then to indicators to detect the range, angular position, and range rate.
Inventors
- 👤 C Sletten
- 👤 W Goggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:57
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/522; G01S13/524; G01S13/53
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
131 words
An analog airborne moving target detection system comprising: a. a coherent radar transmitter; b. a plurality of radiating elements; c. means for connecting the plurality of radiating elements to the radar transmitter in a preselected pattern; d. a plurality of series of receiver scaling circuits, each of the series being fed by one each of the radiating elements; e. a plurality of summers fed by the corresponding scaling circuits of each of the series; f. a plurality of box car circuits fed by one each of the plurality of summers; g. a plurality of doppler filters each having a different frequency response and fed by one each of the plurality of box car circuits; and h. a plurality of indicating means fed by one each of the plurality of doppler filters.
Claim 2
Dependent Claim
131 words
An analog airborne moving target detection system comprising: a. a coherent radar transmitter; b. a plurality of radiating elements; c. means for connecting the plurality of radiating elements to the radar transmitter in a preselected pattern; d. a plurality of series of receiver scaling circuits, each of the series being fed by one each of the radiating elements; e. a plurality of summers fed by the corresponding scaling circuits of each of the series; f. a plurality of box car circuits fed by one each of the plurality of summers; g. a plurality of doppler filters each having a different frequency response and fed by one each of the plurality of box car circuits; and h. a plurality of indicating means fed by one each of the plurality of doppler filters.
Claim 3
Dependent Claim
57 words
An airborne moving target detection system according to claim 1 wherein the connecting means comprises: a. a Butler matrix having a plurality of inputs and a plurality of outputs being fed to one each of the plurality of radiating elements; and b. means for selectively switching the transmitter to the plurality of inputs of the Butler matrix.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |