斜入射时声靶的时延偏差及修正方法

The Oblique Shot Induced Time-lag Error and Its Correction in Acoustic Target

在一些射击场合中,弹丸与靶平面并不一定垂直,这时,利用弹道激波测量弹着点时,就需要考虑弹丸斜入射带来的影响。提出了利用圆盘阵列来修正斜入射产生的时延估计偏差的方法。利用圆盘的几何关系,推导了入射方向的投影与靶面夹角的近似计算公式,通过曲线拟合,得到了接近于实际的夹角,利用该夹角进行了时延偏差的修正。数值分析的结果表明,通过修正时延偏差能有效地改善弹丸斜入射对定位精度的影响。

In this paper,the influence of oblique shot on time-lag estimation is studied.The method,making use of a circular array to correct the time-lag error induced by the oblique shot,is presented.According to the geometrical relation of the circularity array,an approximate calculation function for the angle between ballistic trajectory projection and target surface is deduced.Through the curve fitting,the almost real angle is obtained,which is used in the correction of the time-lag error.The numerical results show that the influence of oblique shot on position accuracy can be reduced through correcting the error of time-lag and the method is feasible.