Abstract
A preprocessing stage for wide-band direction finding is formulated in the framework of multichannel filtering wherein the filter frequency response matrices are chosen to achieve signal-subspace focusing. Direction finding based on any narrow-band algorithm is then performed on the filter output. A procedure for specifying a sparse response suitable in nonstationary environments is presented. An approach to filter design that avoids explicit evaluation of the frequency response is proposed. Extensions to beam-space processing are discussed from the standpoint of simple implementation structures. Simulation studies confirm the usefulness of the various focusing multichannel filters.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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