一种平面差分传声器阵列的声成像算法

An acoustic imaging algorithm for planar difference microphone coarray

为了减小已有声成像定位系统使用的阵元数,提出一种基于差分域的平面传声器阵列的高分辨率成像方法。将该方法运用于二维嵌套阵列等平面稀疏阵列结构,在差分域获得具有更高自由度的均匀矩形阵列,从而用少量的传声器获得高分辨的声成像。仿真结果表明:所提算法在使用49个阵元的情况下比基于典型平面阵列使用81个阵元进行常规波束形成的声成像算法得到的主瓣宽度更窄,在低信噪比时定位精度更高。

Microphone array-based acoustic imaging technology is widely used in noise source localization and other applications.A large number of microphone arrays are typically needed to achieve higher spatial resolution.In this paper,we propose a high-resolution imaging algorithm in the domain of difference coarray of planar microphone arrays is proposed,which aims to decrease the number of microphone arrays employed in the current acoustic imaging systems.By applying the proposed method to a two-dimensional nested array,a uniform rectangular array with a significantly higher degree of freedom can be obtained in the difference coarray domain.Through the new algorithm,a high-resolution acoustic imaging with a relatively small number of microphones is achieved.In comparison to the acoustic imaging technique based on a standard planar array,which needs 81 elements for traditional beamforming,simulation results demonstrate that the proposed method employs 49 elements to realize an even less main lobe width.Additionally,the positioning accuracy of the proposed algorithm is higher at a low signal-to-noise ratio.