A Broadband Focusing Beamforming with Adaptive Side-Lobe Suppression

For the poor inhibition ability of the traditional beamforming in the interference position, this paper proposes an adaptive broadband beamforming algorithm based on combining the rotating signal subspace (RSS) transform with optimal focusing frequency and second order cone programming (SCOP). Firstly, the algorithm introduces the idea of focus transformation, focusing each sub-band of broadband signal to the optimal focusing frequency through focusing matrix. Then, through the side-lobe suppression adaptive algorithm based on the second-order cone programming, the output power of interference and noise is minimized by applying the main lobe constraint in the desired direction and the side-lobe level constraint near the interference direction.. Finally, the effectiveness of the algorithm is verified by computer simulation.