基于刚性圆柱上均匀圆阵的改进MUSIC算法

探讨了存在障碍物时声源波达方向估计问题。以环绕在刚性圆柱上的均匀圆阵为阵列模型,从声波的传播和扩散原理出发,在对声场特性的分析中将声学原理和阵列信号处理技术相结合,分析了刚性圆柱体散射声场及其分解,以及刚性圆柱体对圆阵响应的影响,在对声场分解所得到的特征波束空间,利用实值MUSIC算法实现了声源波达方向估计。该算法能较好地估计出空间多个声源的波达方向,并且具有计算量小,估计精度高和解相关声源的能力。计算机仿真结果验证了算法的有效性。

Modified MUSIC algorithm based on uniform circular array mounted around rigid cylindrical baffles

This paper is concerned with the problem of direction of arrival(DOA) of acoustic sources.Based on the foundations of classical array signal processing and the principles of wave propagation and scattering offered by classical acoustics,the scattering wavefield and its decomposition of a rigid spherical baffle is analyzed in detail using the array model of a uniform circular microphone array(UCA) mounted on a rigid cylindrical baffle.The influence of the rigid cylindrical baffle on the UCA response is analyzed at the same time.In the eigenbeam space derived from the decomposed wavefield,DOA estimation of acoustic sources is realized using a novel formulation of the popular MUSIC algorithm.Computer simulations demonstrate that the algorithm has the ability of estimating the DOA of multi-acoustic sources validly.Furthermore,it has the merit of low computational load and high performance and the ability of processing coherent acoustic sources.