华盛顿讯——美国国防部正在研制一个新的应急的导弹预警系统。这是一种红外望远镜,它由侦察飞机（例如洛克希德公司的U-2飞机）运载到大约70000英尺的高空,用以探测和跟踪袭击美国的核弹道导弹。 目前正在研制的项目是高生存力的低频应急无线电通讯网。这是与长波红外光学探测器配套的项目。 WASHINGTON - The U.S. Department of Defense is developing a new emergency missile warning system. It is an infrared telescope carried by reconnaissance aircraft (such as Lockheed U-2 aircraft) to an altitude of about 70,000 feet to detect and track nuclear warheads that attack the United States. The project currently under development is a viable low-frequency emergency telecommunications network. This is the project with long-wave infrared optical detector.