The unique feature in this missile its loitering mode. Le missile BAe/MSDS ALARM fut développé pour les années 1980 à la demande du bureau des cibles de la RAF. The missile is launched at low level near the suspected site of an enemy radar and, after launch, rapidly climbs to about 12,000 m. At this height, a small parachute opens and the missile descends earthwards while the on board radar searches the broadband for emissions from enemy radar. The parachute loiter modes of the ALARM leave the Sword of Damocles literally hanging over the radar operator's head, as soon as he lights up the missile dives on to him. Aside from a direct attack pattern it may travel up to 13 km altitude and if the target radar shuts down it slowly descends using a parachute.

As an air launched missile the ALARM has a conventional design. Once launched, ALARM has some loitering capability using a built-in parachute which allows to descend slowly after the missile climbs to 40,000 feet (12,000 meters) of altitude.

Alarm Anti-Radar Missile (UK) This is the original prototype version of the British ALARM Anti-Radar missile.

If an enemy radar powered down to avoid being targeted, the missile could fly up to an altitude of 40,000 feet and deploy a parachute. The seeker and warhead are housed in the nose and the engine makes up the rest of the missile. The ALARM had some other tricks. With the ALARM, this is not possible, as the missile can still navigate its way to the target, or anyway go into loitering mode, climbing at high altitude and dangling from a parachute, forcing the enemy to either keep the radar turned off, letting the strike jets pass, or turn on the radar and be destroyed.

When fired at an enemy radar source, the enemy can often detect the incoming missile and switch off their equipment, thereby depriving the missile of a target. En compétition directe avec l'engin américain AGM-88 HARM pour une commande de 2 000 exemplaires par la RAF, l'ALARM fut choisi en juillet 1983, et entra en service en 1990. The ALARM will typically loiter for several minutes at medium to high altitude, subject to the initial launch profile of the missile. The later production model can be distinguished by its blunter nose cone and the bulge of a sensor blister near the nose. A long, thin missile with four small wings and fins, the Alarm weighs little enough that it can be carried in numbers on MERs. This way the missile has the chance of detecting the target if it was turned off by its operator warned of the missile's presence. Operating Modes. An innovative feature of the first Alarm, and repeated in all versions since, was the retarded attack: a missile would be launched in the direction of a radar post, and if it detected no emissions, soared as high as it could, then deployed a parachute and descended.

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