基于改进Laplace小波时延提取的声源定位方法

Sound source localization method based on improved Laplace wavelet time delay extraction

针对侵彻弹命中多层硬目标后产生的撞击声的定位问题,提出了一种基于改进Laplace(refined Laplace,R-Laplace)小波时延提取的声源定位方法。该方法通过先验信息处理构造出Laplace小波,与声信号进行相关系数计算得到时延信息,并结合搜索匹配算法求得多次撞击的声源位置。搭建了声源采集定位系统,并进行多次硬目标撞击声试验。外场试验结果表明,可以定位出4层撞击的声源位置,定位误差平均为0.3 m。相较于传统基于到达时间差的定位算法定位精度较高。该算法在基于到达时间差声源定位问题中具有较大的应用潜力,对实际应用中的声源定位问题具有重要意义。

Here,aiming at the localization problem of impact sound generated by penetrating projectiles hitting multi-layer hard target,a sound source localization method based on improved Laplace or refined Laplace wavelet delay extraction was proposed.This method could construct Laplace wavelet with prior information processing,calculate correlation coefficients between Laplace wavelet and sound signals to obtain time delay information,and combine the search matching algorithm to obtain the location of multi-impact sound source.A sound source signal acquisition and positioning system was built,and used to conduct multi-hard target impact sound tests.Outfield tests showed that using the proposed method,a 4-layer impact sound source position can be located with an average positioning error of 0.3 meter;compared to traditional positioning algorithms based on time difference of arrival,the proposed method’s positioning accuracy is higher;this algorithm has larger potential for application in sound source localization problems based on TDOA,and is of great significance for practical sound source localization problems.