弹道导弹

Combat effciency of ballistic missile is validated,many countries attache more importance to ballistic missile defence system .

通过对比分析了美国和俄罗斯的弹道导弹防御系统的发展战略及基本思路，介绍了美国的弹道导弹防御系统的技术发展趋势，结合我国的实际情况，阐述了发展弹道导弹防御系统的思路。

In the analyse of ballistic missile defense systems, it is important to analyze the

文摘：在弹道导弹防御系统性能分析中，战术弹道导弹进攻的威胁特性分析是一个比较重要的环节。

As a result, it shows thatthe static or dynamic subsystem optimum alone is not equal to the system optimum. Three initial value problems met in the optimal design of flying vehicle are studied andconclusions are derived that: orthogonal test method can be adopted to decide the initial valueof static optimization problem, some mathematical techniques can be used to deal with thecostate variables of Maximum Principle and decide the initial value of the costate variable,the indirect method can be used to get the analytical solution under ideal case to guide thechoice of the initial control curve in the direct method. With some numerical examples oftrajectory optimization, it shows that all these methods are useful not only in accelerating theconvergence but also in converging to the global optimum.

针对飞行器优化设计中的三种初始值问题进行了研究，以远程弹道导弹弹道的工程优化为例说明，对于静态优化问题，采用正交试验法选取初始值，不仅可以大大加快收敛的速度，而且更有可能收敛到全局最优解；以气动力辅助变轨问题为例说明，用共态变量的一阶泰勒级数展开可以解决极大值原理中共态变量初值难于确定的问题；以二级弹道导弹的主动段弹道优化为例说明，利用间接法在理想情况下得到的解析解来指导直接法初始控制曲线的选择，将大大有利于提高直接法的收敛速度。

"China continues to field very large numbers of conventionally armed SRBMs opposite Taiwan and is developing a number of new mobile conventionally armed medium-range systems," says the Pentagon's February "Ballistic Missile Defense Review Report."

五角大楼2月份发布的"弹道导弹防御评论报告"称："中国继续针对台海布署常规的短程弹道导弹，同时正在发展一定数量的新型可移动式常规中程导弹系统。"

In a conventional conflict this could result in a significant increase in the number of ballistic missiles fired at targets, potentially allowing any ATBM or ABM systems in the area to be oversaturated.

在传统冲突当中这还将导致弹道导弹对方针发射数目的明显增多，以便让方针区的任何反战术弹道导弹或反弹道导弹体系步入饱合状况。

North Korea is not allowed to fire scuds, medium-range missiles or long-range missiles under a resolution that bans any launch using ballistic missile technology.

联合国安理会决议禁止朝鲜用使用任何弹道导弹技术。在该决议下，朝鲜禁止发射&飞毛腿&以及中远程弹道导弹。

For best shot effect, hitting target by many missile at one time is required generally when the ballistic missiles attacks target. So, it is important for ballistic missile's firepower control to confirm shot time based on flight time.

为了达到最佳射击效果，弹道导弹突击目标时经常需要多枚导弹同时击中目标，因此根据飞行时间确定发射时间则成为弹道导弹火力控制问题的重要内容。

They believed that the first round of threat would come from Taiwan who is now developing surface-to-surface ballistic missile, and it is also possible that North Korea's ballistic missile technologies may further proliferate.

他们认为，最重要的威胁将来自现今正致力发展地对地弹道导弹的台湾，此外朝鲜的弹道导弹技术也有进一步扩散的可能。

Absent from the rehearsals has been a larger intercontinental ballistic missile which defence experts believe China is developing, as well as the country's new submarine-launched ballistic missile.

国防专家认为，中国目前正在研制一种更大型的洲际弹道导弹，但这种导弹并未现身阅兵演练，同样缺席的还有中国新型潜射弹道导弹。

The earth rotation is one of the important factors which affect the accuracy of ballistic missile trajectory.

地球旋转是影响弹道导弹弹道精度的重要因素，通过运用简化公式对地球旋转对弹道导弹精度的影响进行了计算。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失