针对传统幕中触发时刻提取方法未考虑光幕幕厚分布不均匀而引入的测量误差, 提出了一种弹丸以一定角度穿过光幕厚度呈倒梯形分布光幕的过幕时刻提取方法.通过分析光幕的空间分布, 推导了相应的计算公式将弹尾到达光幕厚度中心面的时刻与弹丸穿过整个光幕时间的比值转换为中心面所在位置与弹丸在光幕中飞行距离的比值, 利用迭代算法提取出弹尾到达光幕中心面的时刻, 并计算出弹丸的外弹道飞行参数.实弹射击表明, 算法在一定范围内可将六光幕阵列天幕立靶测量误差减小1mm.

A modified moment acquisition method of projectile going through a trapezoidal screen in certain angle was put forward,for mid-screen trigger has not taken measuring error caused by the screen′s uneven thickness distribution into consideration in tradition.Firstly,the ratio of the position for the central plane and the distance for the projectile flight in the screen was calculated,then converted the ratio to the moment for the projectile trail arriving at the screen thickness′ central plane and the time for the projectile going through the whole screen.Furthermore,using the iterative algorithm extracts the moment of the projectile trail arriving at the central plane,thus the space-time parameters of the projectile was calculated at the same time.The method was verified by the real projectile tests,and the results show that it has the capability to reduce 1mm measuring error of the six-light-screen array sky screen in certain range.