NARROWBAND BEAMFORMER USING NONLINEAR OSCILLATORS
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United States of America Patent
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-
Oct 29, 2002
Grant Date -
Oct 31, 2002
app pub date -
Apr 30, 2001
filing date -
Apr 30, 2001
priority date (Note) -
Granted
status (Latency Note)
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Abstract
A narrowband beamformer for extracting a mainbeam having a frequency, .OMEGA., that is received at a beamsteered sensor array includes a plurality of nonlinear oscillators. Each nonlinear oscillator operates on a signal from one of the beamsteered sensors to produce a nonlinear oscillator output. A summer receives and sums all of the nonlinear oscillator outputs. Each nonlinear oscillator is coupled to at least one other nonlinear oscillator to create a signal in the summer output having a frequency of approximately, .OMEGA., in response to receipt of the mainbeam signal by the sensor array. Further, the nonlinear oscillators are coupled to create a spectrum of signals in the summer output that are centered around a frequency, {overscore (.omega.)}, in response to receipt of a directional interference signal by the sensor array. A matched filter is used to isolate the frequency, .OMEGA., to thus extract the mainbeam from the directional interference. ?
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