Research On Sound Source Detection And Location Method Of Non-line-of-sight Object Based On Acoustic Sensor Array

In the traditional sound source localization technology,the signal can usually reach the acoustic sensor array directly.Therefore,the sound transmission model is solved by measuring the time difference of reaching different elements in the acoustic array to obtain the position or direction of the object sound source.When the object is occluded by an obstruction,the sound wave will reach the acoustic sensor array through transmission,diffraction and other interface reflections.The signal received by the array element is the superposition of signals from multiple channels,leading to traditional sound source localization algorithm cannot accurately locate the object location.As a localization method in a very special environment,the non-line-of-sight object sound source localization can be realized without the sound source directly reaching the acoustic sensor array.This particularity makes it have a huge application prospect in many fields,such as rescue,counter-terrorism,intelligent driving,etc.First,the current mainstream acoustic sensor array-based sound source localization methods and optical non-line-of-sight object localization methods are summarized and analyzed.The traditional sound source localization method and model are discussed,and the localization performance of the cross-shaped acoustic sensor array and the T-shaped acoustic sensor array are analyzed experimentally.Secondly,this paper proposes a signal receiving model of the acoustic sensor array for the sound source object in a non-line-of-sight area.And analyzes the directional reflection,diffuse reflection,and transmission of sound waves on the reflection interface.Since the sensor receives the superposition of multiple sources,we use frequency-modulated continuous wave as the emission model of the object sound source signal,and obtains the arrival time difference between different array elements through corresponding signal processing.According to the spatial position of the array,establish a system of nonlinear equations.Build fitness function,use the particle swarm optimization algorithm to solve the nonlinear equations,and solve the spatial position of the sound source object in the non-line-of-sight area.Finally,built an experimental system and platform for sound source detection and location in the non-line-of-sight area based on the acoustic sensor array.When building the information collection system,considering the equipment cost and functional requirements,PDM type silicon microphone was selected as the array element of the microphone array.In order to eliminate the space confusion caused by a single uniform array,we use five-element cross type and four-element T type Two-dimensional microphone array topological structure in which arrays are combined.The experimental results show that the designed non-line-of-sight object localization system achieves the expected effect,which verifies the feasibility of the method in this paper.