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In an adaptive array beamformer, a spatial beamforming filter is connected to a sensor array for respectively filtering and summing array signals to produce a first filter output containing a target signal that arrives in a specified direction. First adaptive filters provide transversal-filtering th

In an adaptive array beamformer, a spatial beamforming filter is connected to a sensor array for respectively filtering and summing array signals to produce a first filter output containing a target signal that arrives in a specified direction. First adaptive filters provide transversal-filtering the first filter output to produce a second filter output not containing the target signal, using a first error signal by restraining their tap weight coefficients. The array signals are further coupled

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An adaptive array beamformer comprising: an array of spatially distributed sensors; a spatial beamforming filter connected to said sensors for respectively filtering output signals of the sensors and summing the filtered output signals to produce a first filter output containing a target signal arri

An adaptive array beamformer comprising: an array of spatially distributed sensors; a spatial beamforming filter connected to said sensors for respectively filtering output signals of the sensors and summing the filtered output signals to produce a first filter output containing a target signal arriving at said array in a specified direction; a plurality of first adaptive filters, each having a tapped-delay line connected to receive said first filter output, coefficient update means for producing tap weight coefficients indicating correlations between tap signals from the tapped-delay line and a first error signal applied thereto, a multiply-and-sum circuit for weighting said tap signals with said coefficients respectively and summing the weighted tap signals to produce a second filter output not containing said target signal, said coefficient update means including restraining means for preventing said coefficients from increasing indefinitely; a plurality of first subtractors, each detecting a difference between an output signal of a corresponding one of said sensors and the second filter output of a corresponding one of said first adaptive filters and supplying the difference to the coefficient update means of the corresponding first adaptive filter as said first error signal; a plurality of second adaptive filters, each having a tapped-delay line connected to receive said first error signal from a corresponding one of said first subtractors, coefficient update means for producing tap weight coefficients indicating correlations between tap signals from the tapped-delay line and a second error signal applied thereto, a multiply-and-sum circuit for weighting said tap signals with said coefficients respectively and summing the weighted tap signals to produce a third filter output, said coefficient update means including restraining means for preventing said coefficients from increasing indefinitely; an adder for summing the third filter outputs from the second adaptive filters; and a second subtractor for detecting a difference between the first filter output and a summed signal from said adder and supplying the difference to the coefficient update means of said second adaptive filters as said second error signal.