Calculation Model of Projectile Explosion Position by Using Acousto-Optic Combination Mechanism

In order to accurately calculate the projectile explosion position, this paper takes the five acoustic sensors as a basic array, and proposes a test method for the projectile explosion position based on acousto-optic combined detection of triangular basic array composed by three basic arrays. The photoelectric detection sensor is the synchronous acquisition reference source, and its position is the coordinate origin of the system. Combining with the spatial layout of triangular basic array, we derive the calculation model of projectile explosion position parameters of each basic array; use the wavelet transform analysis method to filter the acoustic sensor signal, and use the cross-correlation function method to establish the time delay estimation model of the projectile explosion acoustic signal in the same basic array and obtain the time difference of each sensor in the basic array. The coordinates of projectile explosion position can be calculated by the established calculation function. Through basic array acoustic sensor signal collected by experiments, we analyze the distribution characteristics of acoustic signal strength generated by different projectile explosion positions. And the projectile explosion position coordinates were finally obtained by filtering processing algorithm and cross-correlation function estimation method. At the same time, the data calculated by proposed method are compared with the data measured high-speed photography method. The results show that the measurement accuracy of the proposed method is better than 0.6m in the range of 150m×150m, which verify the efficiency of this method.