分布式圆阵空间宽带声源定位方法

为提高空间声源定位精度、减少计算量、提高噪声鲁棒性，提出了一种高精度的分布式圆阵空间声源定位方法。该方法首先将声信号通过聚焦矩阵转换成窄带信号，再利用空间谱及其相位信息的群延迟函数乘积消除无关伪峰，得到高精度声源波达方向估计。然后借助于区域质心在三维坐标系的各投影面分别建立粗略信号源区域。最后结合联合可控响应功率相位，进行区域收缩，得到粗略收缩区域，并将互功率谱最大点作为声源定位估计。该方法利用群延迟函数提高了空间谱信息利用率，得到高精度波达方向估计，增强了初始区域的可靠性；区域质心收缩和可控响应功率相位联合应用，可快速锁定声源位置，降低搜索的复杂度。另外分布式阵列的大孔径、对子阵位置变化不敏感的特性增强了该方法对噪声的鲁棒性。仿真实验验证了该算法能实现高精度声源定位。 

Localization Method of Spatial Wideband Sound Source on Distributed Circular Array

To enhance the resolution of sound source location, reduce computation cost and improve noise robustness, a localization method of spatial wideband sound source on distributed circular array is proposed. Firstly, the acoustic signal is converted into narrowband signal through focusing matrices. Then the product of spatial spectrum and the group delay function of its phase information could eliminate pseudo peaks and obtain high resolution DOA estimation in the group delay spectrum. Secondly, with the help of region centroid, the rough source region would be built on each projective planes of the spatial coordinate system. Then combine with the Search Region Contract (SRC) method realized region contract and gained the rough contract region. Finally, find the points corresponding to maximum cross power spectrum as the source localization estimation by using Steered Response Power with Phase Transform (SRP-PHAT) method in rough contract region. The method by using group delay function not only enhanced utilization rate of spatial spectrum information and the reliability of initial region but also gained the high resolution DOA estimation. The new method which combine SRC with SRP-PHAT can locking sound source position quickly and reduce searching complexity. In addition, the distributed array features with large aperture and not sensitive to position changes had greatly enhance noise robustness of the proposed system. Simulation results verify that the proposed method can realize a more precise source location estimation.