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美国的“国家导弹防御”(NMD)系统,系指能保护美国全国的战略防御系统,即地基的战略导弹防御系统。1996年,克林顿的民主党政府把发展“国家导弹防御”系统的计划,由“技术准备计划”改为“部署准备计划”,为此制定了一个将耗资约100亿美元的“3+3”计划,即先用3年的时间发展“国家导弹防御”系统所需的各种部件技术,拟于1999财年底进行拦截非核弹头的试验。2000财年作出是否部署该系统的决定。如决定部署,就在随后的3年时间内形成初步作战能力。现在,这项“3+3”计划正在实施中。一旦计划实现,此系统即可对付5～20枚弹道导弹对美国的攻击,并可为加拿大提供一定的保护。NMD 系统的组成与部署NMD 系统由地基拦截弹、地基雷达、天基传感器、改进的预警雷达、作战管理/指挥控制与通信(BM/C~3)系统等
The U.S. National Missile Defense (NMD) system refers to the strategic missile defense system that can protect the entire nation of the United States, that is, the strategic missile defense system on the ground. In 1996, the Clinton Democrat government changed its plan to develop a “national missile defense” system from a “technology readiness plan” to a “deployment readiness plan”, setting a “3 + 3” plan that will cost about 10 billion U.S. dollars , That is, to develop the various component technologies required for the “National Missile Defense” system over a three-year period and plan to carry out tests to intercept non-nuclear warheads by the end of fiscal 1999. FY2000 decision to deploy the system. If decided to deploy, in the next three years to form a preliminary combat capability. Now, this “3 + 3” plan is in progress. Once planned, the system can deal with 5 to 20 ballistic missiles attacked the United States and provide some protection to Canada. Composition and Deployment of NMD Systems NMD systems consist of ground-based interceptors, ground-based radars, space-based sensors, improved early warning radars, BM / C 3 systems