Research On Passive Location Method Of Acoustic Source Target Based On Dual Microacoustic Array

Sound source localization technology is a passive target localization technology,which is widely used in military and civil fields due to its characteristics of covert operation,no line of sight constraints,and anti electromagnetic interference.In close urban street battles and antiterrorism strikes,combatants use highly penetrating gunshot signals to detect targets,which can improve the accuracy of identifying and locating enemy firepower sources and enemy personnel positions,thereby improving individual anti-terrorism combat capabilities.However,factors such as reverberation and interference exist in complex battlefield environments,resulting in a low signal-to-noise ratio of gunshot signals;At the same time,due to the short baseline of the acoustic sensor array,it is difficult to extract positioning parameters,which leads to difficulty in effectively locating the gun sound source target.In response to the above issues,this article conducts research on a joint localization method based on dual micro acoustic arrays.Firstly,the topology of a single acoustic sensor array is optimized,and the dual array structure is optimized based on human physiology;Secondly,the variational mode decomposition(VMD)algorithm based on Hausdorff distance is used to denoise the gunshot signal,and the resolution of time difference measurement is improved through the group wave phase difference extraction method.The generalized cross-correlation time delay estimation is used to remove the phase ambiguity and improve the time difference characteristic parameter acquisition capability of the micro acoustic array;Once again,a dual array joint localization model was established to quickly locate the area where the gunshot source is located through the dual array cross localization algorithm;Introducing an adaptive dynamic search range control strategy and improving the QPSO swarm intelligent optimization algorithm to perform refined search,scanning,and positioning in the area where the sound source is located;Finally,verify the feasibility of the proposed method.The experimental results show that the proposed method based on dual array joint sound source localization effectively improves the accuracy of sound source localization within a range of 20 meters,with a single array baseline of 0.11 meters and a dual array distance of 0.4meters.The localization error is within 5%.It has certain practical engineering application value in gun sound localization.