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USH740H
Expired / Lapsed
US
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Antenna sidelobe interference canceller
Assignee: United States Department of the Army
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Filing: 1989-06-13
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Granted: 1990-02-06
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Expires: 2009-06-13
Abstract
Abstract Interference signal cancelling is provided by a multiplexed interference celling system that utilizes a primary high gain antenna and an auxiliary antenna pair including a low gain notch antenna in conjunction with a low gain omnidirectional antenna. The output of the two low gain auxiliary antennas are subtracted from each other to provide an output that is substantially free of all input signals except for the interfering signal received in the narrow notch of the notch antenna. This signal is then subtracted from the composite output signal of the primary antenna. One of these auxiliary antenna pairs is employed for each separate jamming signal source to be cancelled, thus enabling each jamming signal to be orthogonally isolated, whereupon its magnitude and phase is then adjusted to be equal to and 180° out of phase with the same component contained in the composite signal from the primary antenna. Each interfering signal is then separately subtracted from the composite signal, leaving only the desired signal.
Inventors
- 👤 Frank S. Gutleber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:49
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/2605; H01Q3/2611; H01Q3/2629
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
134 words
An antenna sidelobe interference cancelling system, comprising: primary receiving antenna means including an output for providing a first output signal including a desired signal and all of a plurality of interfering signals; at least one auxiliary receiving antenna pair including omindirectional antenna means and steerable notch antenna means, said notch antenna means including a notch in the radiation pattern thereof directed to one of said interfering signals; first circuit means connected to the respective outputs of said auxiliary antenna pair and differencing the output signals generated thereby to generate a second output signal corresponding to said one interfering signal; and second circuit means connected to the output of said primary antenna means and said first circuit means for subtracting said second output signal from said first output signal and generating a control output signal.
Claim 2
Dependent Claim
134 words
An antenna sidelobe interference cancelling system, comprising: primary receiving antenna means including an output for providing a first output signal including a desired signal and all of a plurality of interfering signals; at least one auxiliary receiving antenna pair including omindirectional antenna means and steerable notch antenna means, said notch antenna means including a notch in the radiation pattern thereof directed to one of said interfering signals; first circuit means connected to the respective outputs of said auxiliary antenna pair and differencing the output signals generated thereby to generate a second output signal corresponding to said one interfering signal; and second circuit means connected to the output of said primary antenna means and said first circuit means for subtracting said second output signal from said first output signal and generating a control output signal.
Claim 3
Dependent Claim
94 words
The system of claim 1 wherein said at least one auxiliary antenna pair comprises a plurality of auxiliary antenna pairs each including respective omnidirectional antenna means and steerable notch antenna means, said plurality of notch antenna means being directed to selected different ones of said interfering signals, wherein said first circuit means comprises a like plurality of first circuit means respectively connected to said auxiliary antenna pairs for generating a respective number of second output signals, and wherein said second circuit means subtracts all of said second output signals from said first output signal.
Claim 4
Dependent Claim
27 words
The system of claim 2 wherein said plurality of auxiliary antenna pairs are at least equal in number to the number of said plurality of interfering signals.
Claim 5
Dependent Claim
26 words
The system of claim 2 wherein said second circuit means includes means for subtracting each of said second output signals individually from said first output signal.
Claim 6
Dependent Claim
36 words
The system of claim 4 and additionally including means for adjusting the amplitude and phase of the respective second output signals to match corresponding interfering signals in said first output signal from said primary antenna means.
Claim 7
Dependent Claim
32 words
The system of claim 5 and additionally including means for adjusting the amplitude and phase of said second output signals in response to the control output signal of said second circuit means.
Claim 8
Dependent Claim
23 words
The system of claim 6 wherein said means for adjusting the amplitude and phase of said second output signals comprises null detector means.
Claim 9
Dependent Claim
46 words
The system of claim 4 wherein said means for subtracting each of said second output signals of said second circuit means includes a respective number of linear subtractor means connected in series for subtracting each of said second output signals individually from said first output signal.
Claim 10
Dependent Claim
34 words
The system of claim 4 wherein each of said first circuit means further comprises orthogonal signal extractor means including linear subtractor means including an output coupled to the outputs of said auxiliary antenna pair.
Claim 11
Dependent Claim
66 words
The system of claim 9 wherein each said signal extractor means additionally includes, notch scanner circuit means coupled to respective said notch antenna means, and peak envelope detector means coupled between the output of said linear subtractor means and said notch scanner circuit means for causing the notch in the radiation pattern of said respective antenna means to track a respective one of said interfering signals.
Claim 12
Dependent Claim
50 words
The system of claim 10 wherein each said signal extractor means additionally includes signal amplitude and phase adjusting means coupled between the output said respective notch antenna means and said linear subtractor for causing the output of said respective notch antenna means to match the output of said omnidirectional antenna.
Claim 13
Dependent Claim
53 words
The system of claim 10 and additionally including signal gate circuit means coupled between each said linear subtractor means and each said second circuit means, and means responsive to the amplitude of the output of said respective notch antenna means for enabling said gate circuit means when said output reaches a predetermined amplitude.
Claim 14
Dependent Claim
15 words
The system of claim 12 wherein said means responsive to amplitude comprises a threshold detector.
Claim 15
Dependent Claim
41 words
The system of claim 13 and additionally including gate pulse generator means coupled between said threshold detector and said gate circuit means for generating an enabling pulse for said gate circuit means in response to the output of said threshold detector.
Claim 16
Dependent Claim
36 words
The system of claim 14 and additionally including means for adjusting the amplitude and phase of the respective second output signals to match corresponding interfering signals in said first output signal from said primary antenna means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |