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考虑长基线水平阵列波束形成对声场模态呈现的滤波特征,建立了一种随频率改变滤波通带的阵列权矢量设计方法。基于简正波理论,结合声场波束形成特点,在分析了常规波束形成信号LOFAR谱图干涉条纹的清晰度和条纹结构不同于单水听器输出信号条纹现象基础上,采用线性等式约束的二次优化模型,给出了一种频率自适应的最优权重估计。数值仿真验证和试验数据分析表明,利用该方法设计的最优权重阵列波束处理,可以滤波出SRBR(Surface-Reflected Bottom-Reflected)或N-SRBR(Non-Surface-Reflected Bottom-Reflected)模态组成的波束形成信号,信号谱图干涉条纹斜率与理论分析基本一致。
Considering the filtering characteristics of the beamforming of the long baseline horizontal array to the acoustic field modes, an array weight vector design method with frequency-changing filtering passband was established. Based on the theory of simple normal wave and the characteristics of the beamforming of the sound field, based on the analysis of the sharpness and fringe pattern of the interference fringes in the LOFAR spectrum of conventional beamforming signals, the quadratic optimization of the linear equation constraint Model, a frequency adaptive optimal weight estimation is given. Numerical simulation and experimental data analysis show that the optimum weight array beamforming method designed by this method can filter out SRBR (Surface-Reflected Bottom-Reflected) or N-SRBR (Non-Surface-Reflected Bottom-Reflected) modal composition Of the beamforming signal, the slope of the signal spectrum interference fringes and theoretical analysis are basically the same.