双等边三角阵声学靶测量原理

Measurement Principle of Acoustic Target With Two Equilateral Triangle Array

为了解决双等边三角阵声学靶测量弹着点坐标计算过程繁琐的问题,在局部将激波在预定靶平面上的曲面传播看成是平面传播,得到了激波在各个传声器之间传播的声程差与三角阵边长之间的几何关系,通过解三角形求得了弹着点的坐标测量公式.通过仿真计算对该坐标测量公式的理论误差进行了分析,在对4m×4m靶面的仿真中得到x、y坐标测量误差分别为±10mm和±25mm.仿真结果表明,该测量公式形式简单,且具有较高的精度.

The procedure of acoustic target with two equilateral triangle array measuring projectile position coordinates is complicated.Aiming at this problem,curved-surface transmittal of shock wave on predetermined target surface was considered as plane transmittal in local zones.The geometry relations between the sound path difference and the length of equilateral triangle were obtained while the shock wave transmitting among microphones.The measurement equations of projectile position coordinate were got by solving the right triangles.The theory error analysis was carried out through numerical simulation.The measurement error ranges of x and y are ±10 mm and ±25 m respectively by simulating the target with an area of 4 m×4 m.The results show that the measurment equations are simple in form,and have higher precision.