三维空间非同步测量高分辨率声成像方法

为解决三维空间中声源成像分辨率低的问题,提出一种基于非同步测量的三维空间声成像方法。该方法首先通过移动球形传声器阵列扫描空间分布的声源,然后利用非同步测量技术近似得到大孔径、高密度的传声器阵列测量结果,最后通过传统波束形成算法成像。仿真及实验结果表明,该方法与单次测量下的波束形成方法相比,聚焦性能更好,空间分辨率高,可实现三维空间中声源分布的高分辨率成像;同时,该方法成像结果可替代多阵列的同步测量结果,无需参考传声器,避免了使用参考传声器在增加通道数量以及空间布置问题上的局限性。 

High resolution acoustic imaging method by non-synchronous measurements in three-dimensional space

In order to solve the problem of low resolution of acoustic imaging in three-dimensional space,a threedimensional acoustic imaging method based on non-synchronous measurements is proposed.In this method,the spatially distributed sound source is scanned by moving the spherical microphone array,then the measured result of the microphone array with large aperture and high density is approximately obtained by using the non-synchronous measurement technique,and finally the image is obtained by the traditional beamforming algorithm.Simulation and experimental results show that the proposed method has narrower main lobe width and higher spatial resolution compared with beamforming with a single measurement,and can achieve high resolution imaging of sound source distribution in threedimensional space.At the same time,the imaging results of this method can replace the simultaneous measurement results of multiple arrays without a reference microphone,which avoids the limitations of the reference microphone in increasing the number of channels and spatial arrangement.