Biases of initial direction estimation and focusing frequency selection affect the final\nfocusing effect and may even cause algorithm failure in determining the focusing matrix in the\ncoherent signalâ??subspace method. An optimized sonar broadband focused beamforming algorithm\nis proposed to address these defects. Initially, the robust Capon beamforming algorithm was used\nto correct the focusing matrix, and the broadband signals were then focused on the optimal focusing\nfrequency by the corrected focusing matrix such that the wideband beamforming was transformed\ninto a narrowband problem. Finally, the focused narrowband signals were beamformed by the\nsecond-order cone programming algorithm. Computer simulation results and water pool\nexperiments verified that the proposed algorithm provides a good performance.
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