Anti-tank guided missile

An anti-tank guided missile (ATGM) or anti-tank guided weapon (ATGW) is a guided missile primarily designed to hit and destroy heavily-armored tanks and other armored fighting vehicles.

ATGMs range in size from shoulder-launched weapons which can be transported by a single soldier, to larger tripod mounted weapons which require a squad or team to transport and fire, to vehicle and aircraft mounted missile systems.

The introduction of smaller, man-portable ATGMs with larger warheads to the modern battlefield has given infantry the ability to defeat even heavily armored main battle tanks at great ranges, usually with the first shot. Earlier infantry anti-tank weapons such as anti-tank rifles, anti-tank rockets and magnetic anti-tank mines had limited armor-penetration abilities and/or required a soldier to approach the target closely.

"First-generation" manually command guided MCLOS missiles like the AT-3 Sagger require input from an operator using a joystick or similar device to steer the missile to the target. The disadvantage is that the operator must be well trained and must remain stationary and in view of the target during the flight time of the missile. Because of this, the operator is vulnerable while guiding the missile. "Second-generation" semi-automatically command guided SACLOS missiles require the operator to only keep the sights on the target until impact. Automatic guidance commands are sent to the missile through wires or radio, or the missile relies on laser marking or a TV camera view from the nose of the missile. Examples are the American TOW and Hellfire I missiles. Again the operator must remain stationary during the missile's flight.

More advanced "third-generation" guidance systems rely on a laser, electro-optical imager or a W band radar seeker, on the nose of the missile. Once the target is identified the missile needs no further guidance during flight (i.e. it is "fire-and-forget" ) and the operator is free to retreat. However, fire-and-forget missiles are more subject to electronic countermeasures than MCLOS and SACLOS missiles. Examples include the American Javelin, German PARS 3 LR, Israeli Spike and the Indian Nag.

Most modern ATGMs have shaped-charge high explosive (HEAT) warheads, designed specifically for penetrating armor. Tandem-charge missiles attempt to defeat ERA protected armor. The small initial charge sets off the ERA while the follow up main charge attempts to penetrate the main armor. Top-attack weapons such as the Indian Nag and the Swedish Bill are designed to focus the explosion down through an armored fighting vehicle's thinner turret-roof or upper-hull armor.

Countermeasures against ATGMs include spaced, perforated, and composite armour, explosive reactive armour (ERA), jammers like the Russian Shtora, and active protection systems (APS) like the Israeli Trophy and the Russian Arena. Traditionally, before "fire-and-forget" ATGMs were used, the most effective countermeasure was to open fire at the location where the missile was fired from: either the operator would be forced to take cover or he would be killed.

Anti-tank weapons like bazookas and RPGs are not considered ATGMs since the projectile is unguided.

See also

* List of anti-tank guided missiles
* List of missiles

External links

* [http://www.sinodefence.com/army/crewserved/hj8.asp HJ-8 Anti-tank guided missile]
* [http://www.bharat-rakshak.com/MISSILES/Nag.html Nag Missile]
* [http://www.youtube.com/watch?v=7rWJPi7K1Fc Nag missile test video]
* [http://www.zentechnologies.com/anti_tank_guided_misssile_simulator.html Missile simulator]


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