DU Jinxiang  YAN Shenggang  LI Zhishun 

(College of Marine, Northwestern Polytechnical University Xi'an 710072)

Received Jul. 9, 2006

Revised Nov. 14, 2006

Abstract  A weighting orthogonal method for constant beamwidth beamforming matrices is proposed. This method multiplied weighting factors to each orthogonal beamforming matrix cooresponding to different frequency bins. The method proposed doesn't cause waveform aberration, and doesn't cause additional loss of array signal-to-noise ratio when the sources have uniform spectrum. The waveform aberration and additional loss of array signal-to-noise ratio can not be avoided simultaneously by ordinary orthogonal method. So we can get good detection and estimation performances at the same time by the weighting method. Simulation results and water tank experiments are presented to confirm the conclusion above.

PACS number: 43.60