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Title:: Simulation study of non-diffracting array beams acoustic field based on Field II

Author(s):: LIU Dongxue; PENG Hu; HAN Zhihui; Hefei university of technology,Hefei 230000,China

Keywords:: Non-diffracting beams; Field II; Array beams; Capon beamforming; Cosine window

摘要:: 本研究基于Capon波束形成算法提出适用于二维发射声场的Capon窗、并结合余弦窗提出这两种窗复合的加权方法。使用Field II对含噪声场进行加权仿真。在深度150 mm时，使用Capon窗加权仿真的分层阵列波波束形状清晰可见，这种方法有效的抑制了噪声，边缘旁瓣幅度相对含噪声场下降了15 dB。复合权方法集中了这两种方式的优点，在抑制噪声的同时也对边缘声场沿y轴方向的尾影具有一定的抑制作用。

Abstract:: Based on Capon beamforming algorithm, we introduced a new Capon window which could apply to two dimension sound field. Then a weighting method by adpoting both the cosine and this Capon window was presented. Using Field II of weighted noise field simulation, under the depth of 150 mm, the shape of the stratified array wave was clearly visible. This method effectively suppressed the noise, and the edge sidelobe amplitude was reduced by 15 dB relative to the noise field. Compound weight integrates the advantages of both,which suppresses the noise and the tail shadow of a single Capon weighted sound field along the direction of the Y axis is suppressed.