Research On Target Measurement Technology Based On Sound Source Localization

Projectile will produce a shock wave that propagates vertically with the velocity direction when it is flying in the air at supersonic speed,the acoustic sensor array can receive the shock wave,through the array signal processing to locate the projectile,this projectile positioning technology based on the shock measurement has the advantages of simple structure,high positioning accuracy and low cost.In the target measurement system of weapon shooting,the precise positioning of the projectile point and the accurate estimation of the trajectory are very important to identify the performance of the weapon,correct the shooting process and improve the training level.In this paper,aiming at the actual demand of off-target measurement in tactical training such as cannon and rifle shooting,this paper studies the target measurement technology based on shock source localization.This paper mainly introduces the mechanism of projectile shock wave,the characteristics of shock wave,a variety of sound source positioning technology based on time delay estimation and high resolution spectrum estimation.This paper simulates the influence of various factors such as signal-to-noise ratio,number of array elements and projectile angle on the positioning performance of MUSIC algorithm and the performance of different weighting functions under different signal-to-noise ratios;The five-dimensional L-array,quaternary planar array and five-element planar array two-dimensional array model are analyzed,and the quaternion matrix and the five-dimensional three-dimensional array model are deduced.The positioning formula is deduced and the relative spacing distance and other factors were analyzed by computer simulation;A two-five-element L-shaped array model is proposed for five-element L-shaped arrays with high positioning accuracy.Two models of projectile vertical incidence and oblique incidence sensor are analyzed.The projectile positioning and the target the distance between the relative distance of the projectile and the distance between the array and the pitch of the array are analyzed,and the distance between the relative distance of the projectile and the distance of the projectile is analyzed.The distance between the relative distance of the projectile,the larger the distance between the two elements,the larger the distance between the sensor front and the target surface,and the higher the positioning accuracy of the dual five-element L-shaped array.The simulation results show that the improvement of the number of array elements and the improvement of signal-to-noise ratio can improve the positioning performance of MUSIC algorithm to a great extent.The basic cross-correlation and PHAT weighting functions are the best in the algorithm based on time delay estimation.The L-type two-dimensional array model and the quaternion array three-dimensional array model have the highest accuracy for the stationary sound source.For the five-element plane array,the larger the distance between the array and the array is,the smaller the pitch angle is,and the positioning accuracy is higher.For the double five-element L-array model,the incident angle of the projectile,the distance from the array,the array spacing,the front spacing and so on have a great influence on the positioning accuracy of the projectile.