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首页> 外文期刊>The Journal of the Acoustical Society of America >Particle velocity gradient based acoustic mode beamforming for short linear vector sensor arrays~(a))
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Particle velocity gradient based acoustic mode beamforming for short linear vector sensor arrays~(a))

机译:短线性矢量传感器阵列的基于粒子速度梯度的声模波束形成〜(a))

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摘要

In this paper, a subtractive beamforming algorithm for short linear arrays of two-dimensional particle velocity sensors is described. The proposed method extracts the highly directional acoustic modes from the spatial gradients of the particle velocity field measured at closely spaced sensors along the array. The number of sensors in the array limits the highest order of modes that can be extracted. Theoretical analysis and numerical simulations indicate that the acoustic mode beamformer achieves directivity comparable to the maximum directivity that can be obtained with differential microphone arrays of equivalent aperture. When compared to conventional delay-and-sum beamformers for pressure sensor arrays, the proposed method achieves comparable directivity with 70%–85% shorter apertures. Moreover, the proposed method has additional capabilities such as high front–back (port–starboard) discrimination, frequency and steer direction independent response, and robustness to correlated ambient noise. Small inter-sensor spacing that results in very compact apertures makes the proposed beamformer suitable for space constrained applications such as hearing aids and short towed arrays for autonomous underwater platforms.
机译:本文描述了二维粒子速度传感器短线性阵列的减法波束形成算法。所提出的方法从沿阵列紧密间隔的传感器处测得的粒子速度场的空间梯度中提取高度定向的声模。阵列中的传感器数量限制了可提取模式的最高顺序。理论分析和数值模拟表明,声模波束形成器的指向性可与等效孔径的差分传声器阵列获得的最大指向性相媲美。与用于压力传感器阵列的传统延迟和求和波束形成器相比,所提出的方法可实现类似的方向性,孔径缩小70%–85%。此外,提出的方法还具有其他功能,例如高前后(左右)辨别,频率和转向方向独​​立响应以及对相关环境噪声的鲁棒性。传感器之间的小间距可产生非常紧凑的孔径,从而使所提出的波束形成器适用于空间受限的应用,例如助听器和用于自主水下平台的短拖曳阵列。

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