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Theater High Altitude Air Defense
The US Army also is pursuing a THAAD system as an "upper tier" defense to hit incoming missiles at higher altitudes, from 25 to 62 miles. The mission of the THAAD battery is to protect the force and selected geopolitical assets from TBM attack. THAAD batteries provide the upper tier of a two-tier defense against tactical ballistic missiles by engaging them at long ranges and high altitudes (the Patriot system is the lower tier of defense). THAAD can conduct both endo-atmosphere and exo-atmosphere intercepts using hit-to-kill technology. THAAD defense systems are alerted to an incoming missile by orbiting satellites with infrared sensors. Once theincoming missilecomes within range, the interceptors use ground-control radars to lock onto the target. THAAD's ground-control radar is a high-frequency "X-band" system that operates in frequencies above 10 gigahertz to provide a detailed image of the target. THAAD interceptors are fired from launchers carried on trucks, and guided to the vicinity of the target by the satellites and the X-band radar. Once the interceptor reaches an altitude of about 40 kilometers, the booster portion of the missile falls away, with the hit-to-kill vehicle continuing on an intercept course. When it reaches acertain range from the target, the kill vehicle opens a seeker head. The seeker can identify the warm target against the cold background of space, and its processor uses the image to direct a collision course optimized for the type of target. THAAD uses an infrared seeker because it attacks targets above the weather, while the lower-altitude PAC-3 uses a millimeter-wave radar to locate targets in clouds. Дата добавления: 2015-09-18 | Просмотры: 662 | Нарушение авторских прав |