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A method to design a beamformer for broadband constant beamwidth is presented. Constant beamwidth is important in sonar systems for sea bottom observation and classification applications. For a given frequency band, a number of frequency points are chosen to represent the response of an arrary element. For each frequency point a beamforming weight vector can be deduced to satisfy the given beamwidth requirement by existing methods. Therefore, for a broadband array of N elements, each row of the N’ M weighting matrix represents the frequency response of an element of the array which can be satisfied by a FIR filter designed by model - reference adaptive technique. The sum of outputs from a bank of N FIR filters provides a beamformed output and so it is very handy to be implemented by DSP hardware.
A method to design a beamformer for broadband constant beamwidth is presented. For a given frequency band, a number of frequency points are chosen to represent the response of an arrary element. For each frequency point a beamforming weight vector can be deduced to satisfy the given beamwidth requirement of existing elements. Thus, for a broadband array of N elements, each row of the N ’M weighting matrix represents the frequency response of an element of the array which can be satisfied by FIR filter designed by model - reference adaptive technique. The sum of outputs from a bank of N FIR filters provides a beamformed output and so it is very handy to be implemented by DSP hardware.