高精度球面阵聚焦声源定位方法研究

提出了一种高精度高空间分辨率球面阵聚焦声源定位方法——虚拟源法。该方法通过球面阵波束扫描获得实际声源的空间聚焦谱,并假定各扫描点为虚拟声源,将实际声源聚焦谱看作是全体虚拟源共同作用的结果,由此得到各虚拟源对声场的贡献量,从而可实现声源精确定位。仿真研究分析了频率,阵列孔径,声场模态阶数,信噪比等参数对声源定位性能的影响,并与常规算法进行对比。结果显示,该方法不受频率和阵列孔径的限制,避免了空间“混淆”,能够进行高精度高分辨率声源定位,并具有良好的背景噪声抑制能力。 

Research on a high-resolution spherical beamforming algorithm for sound source localization

A high-resolution and high precision spherical array beamforming method for sound sources localization based on virtual sources algorithm is proposed.By means of the spherical array beam scanning,the focused spatial spectrum of actual sound sources can be obtained and each scanning point is assumed to be the virtual sound source. The actual sources focused spectrum is the result of focused beam output by the entire virtual sources,and then high precision sound source localization can be realized by calculating the contribution of each virtual source to the sound field.Compared with the conventional methods,the performance of the proposed method under some influence factors, such as frequency,array aperture,sound field mode orders and ratio of signal to noise is analyzed.The simulation results show that this method is not limited by frequency and aperture of array,effectively reducing the spatial aliasing.The focused spatial spectrum indicates the higher resolution sound sources location and the stronger ability to suppress the fluctuation of the background noise.