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Lock-on after launch (LOAL) is the ability of missile systems to lock-on to a target after being launched from a carrier vehicle. The term is normally used in reference to airborne weapons, especially air-to-air missiles. LOAL is an important part of modern weapon systems as it allows a weapon to be carried internally to increase stealth and then acquire a target once it has left a launching aircraft. LOAL systems normally rely on cuing from a helmet-mounted sight or onboard sensors like radarorforward-looking infrared (FLIR) and use a simple strapdown inertial guidance system to know where to look after launch. Examples of LOAL weapons include the Advanced Short Range Air-to-Air Missile (ASRAAM) and later versions of the AGM-114 Hellfire anti-tank missile. The older method of launch has retroactively become known as lock-on before launch (LOBL), although this term is not commonly used and is a backronym to distinguish it from the LOAL method.
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