| Mainlobe Canceller System. |
01 NOV 1994 |
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| Authors:
James P. Hansen; DEPARTMENT OF THE NAVY WASHINGTON DC
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 | An interference suppression system for cancelling undesired signals received through the mainlobe of an antenna as well as its sidelobes. The interference suppression system has a main channel input having high gain for receiving desired signals and undesired signals and forming a main channel waveform, and an auxiliary channel input having low gain for receiving desired signals and undesired signals and forming an auxiliary channel waveform. A control circuit senses ... |
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| Determination of Jammer Range and Azimuth by Use of a Coherent Side Lobe Canceller System. |
01 NOV 1994 |
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| Authors:
James P. Hansen; DEPARTMENT OF THE NAVY WASHINGTON DC
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| An improved countermeasure detection system and technique for determining the range and azimuth of a noisejammer in a radar environment. A signal limiter is inserted into the output loops of a conventional multi loop side-lobe canceller system such that the loops only respond to interference signals in the main lobe of a radar antenna as it sweeps through the jamming source. Each of the loops develops a weighting signal that ... |
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| Directive Optimization of Coherent Sidelobe Canceller Systems. |
27 SEP 1994 |
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| Authors:
James P. Hansen; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A new technique for improving the operation of a interference suppression system, particularly in a side-lobe canceller system, against multiple interference sources. A plurality of auxiliary receiving antennas, providing interference signals to side-lobe canceller loops, are spaced about a main directional receiving antenna and positioned to preferably form a configuration such that no lines of sight through any two auxiliary antennas are collinear or parallel to a line of sight ... |
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| Sampled Data Processing. |
17 SEP 1991 |
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| Authors:
James P. Hansen; DEPARTMENT OF THE NAVY WASHINGTON DC
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| An improved signal processing system and technique for preprocessing auxiliary data signals by sequential decorrelation, particularly for use in systems employing adaptive canceller loops. Each of a plurality of signal channels sample the environment of a plurality of signal sources and provide inputs to a configuration of adaptive canceller loops. The loops are connected such that an adaptive loop decorrelates the signal from two signal channels to form a preprocessed ... |
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| Understanding and Optimizing Multiple Side-Lobe Canceler Operation. |
25 OCT 1973 |
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| Authors:
Bernard L. Lewis; James P. Hansen; NAVAL RESEARCH LAB WASHINGTON DC
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| A simple technique was developed for analyzing the operation of multiple side-lobe canceler loops on signals from multiple jammers. This technique is a simple graphical method that requires very little mathematics yet gives its user a feel for canceler operation that is missing in the conventional mathematical approach. Examples of the application of this technique demonstrate the falseness of the common belief that 'N' cancelers can adequately cancel the signals ... |
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