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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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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In this study we have attempted to investigate the trajectory stability problems of head-on anti-tactical ballistic missile guidance by way of the Lawes Criterion.

针对一种拦截战术弹道导弹制导规律的特点，以经典的劳斯稳定判据为依据，对其制导控制回路的稳定性进行了分析。

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However, its baseline version of the interceptor is already quite capable, which is why the Navy will conduct a test this spring to see how it fares against a Trident ballistic missile flying a longer, faster trajectory than the service currently is postured to counter.

FORBES: Missile Defense Becomes A Navy Mission

And our recent success in returning to testing of the upgraded version of the so-called GBI, or the CE2 missile, will keep us on a good trajectory to improve our defense capability against limited ballistic missile threats such as those from North Korea.

WHITEHOUSE: Press Briefing

So, even if Iran's ballistic missile program has not progressed as rapidly as previously predicted, it is still on an upward trajectory (pun intended) and our track record of predicting the outcome of such things has been dirt poor.

CENTERFORSECURITYPOLICY: No more surprises