The sky screen target is one kind of sensor of detection projectile through the space reserve plain face time triggering, the sky screen has certain thickness, is not one does not have the thickness ideal plane, the projectile also is not a regular ideal circular column. Therefore, the projectile fly through the sky screen is not an hour point, but a time quantum Research which hour point more precise representa-tive the hour point in the time quantum when the projectile flight through the sky screen, thus trigger the calculagraph, can more precise realization measure the projectile velocity measurement. It analyzed the methods to acquire the time including projectile nose, projectile base, and mid-screen trigger mode, and take the relation between thickness of screens and measuring precision as the starting point, a geometry computational model that a projectile flight through sky screens was built up, The methods to acquire the time in different relation which between length of projectile and thickness of screens were analyzed.%天幕靶是一种探测弹丸通过空间预定平面时刻的触发传感器,天幕具有一定厚度,并不是一个没有厚度的理想平面,弹丸也并不是一个规则的理想圆柱,所以弹丸穿过天幕不是一个时间点而是一个时刻段.研究弹丸穿过天幕的时间段内哪个时刻点更精确的代表弹丸穿过天幕的时刻点,从而触发计时仪,才能更精确的实现弹丸测速.通过论述弹尖、弹底和幕中触发方式的弹丸过靶信息提取方式,以天幕厚度与测试精度之间的关系为出发点,构建了弹丸穿过光幕的几何计算模型,分析了弹长与幕厚的不同关系下的弹丸过靶信息提取的方法.
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