Based on the output signals of the sky screen,a mutuality algorithm used to calculate flying time of the pill is brought forward.

• 在用天幕靶对各种弹丸的速度等外弹道参数进行测量时,往往需要测得弹丸飞越两个天幕靶靶面的时间间隔,进而计算弹丸速度、立靶坐标等其它参数。