In this paper, one advanced air-to-air missile system has been analyzed in order to determine the main characteristics which are sensitive to the boundary of the allowable launch envelope.

本文首先分析了一种先进的空空导弹系统，确定导弹对允许发射区边界敏感的主要性能特点，在此基础上提出了导弹允许发射区的算法。

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China says it has tested an advanced missile interception system, a move that serves as a reminder of the rapidly progressing technological upgrade of its military capabilities.

中国宣布，它试验了一种先进的反导拦截系统。此举提醒人们，中国正在快速推进其军事能力的技术升级。

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The U.S. said on Wednesday it would move an advanced missile-defense system to Guam to defend U.S. bases in the Pacific against medium-range missiles from North Korea.

WSJ: North Korea Moves Missile to Its East Coast

The Patriot is an advanced surface-to-air missile system intended to defend against aircraft, cruise and ballistic missiles.

BBC: Fact file: Patriot missile defence

In addition to the interceptors, Mr. Hagel mentioned Pentagon plans to install a second advanced radar system in Japan to more quickly detect North Korean missile launches.

WSJ: U.S. to Boost Missile Defenses in Response to North Korea