By using the line of sight (LOS) measurements from space based infrared sensors, free flight phase trajectory estimation problem of ballistic missile is studied.

主要研究空间预警系统利用星载红外传感器的视线测量估计弹道导弹自由飞行段弹道的问题。

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According to a predetermined trajectory, ballistic missile with rocket engine propulsion takes a flight to intended targets under the action of the control system.

弹道导弹是用火箭发动机推进，在控制系统作用下按预定的弹道飞行至预定攻击的目标。

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This paper mainly studies how to accurately fit the air dynamics parameter by the ballistic data of projectiles' free flight.

论文主要研究从弹丸自由飞行数据中如何准确地拟合空气动力系数。

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These are widely recognized as far less conducive to a first-strike than are short-time-of-flight ballistic missiles.

CENTERFORSECURITYPOLICY: Roundtable Discussion On The B-2 Bomber

They're reconfigured to shoot down ballistic missiles in flight.

NPR: Missile Defense, the U.S. and Europe

Such defenses have the potential to intercept ballistic missiles early in their flight, i.e.

CENTERFORSECURITYPOLICY: Critics' Study Makes Case for 'Layered' Missile Defense