An anti-radiation missile (ARM) is a missile which is designed to detect and home in on an enemy radio emission source. A missile (see also pronunciation differences) is a self-propelled explosive Projectile used as a weapon towards a target Typically these are designed for use against an enemy radar, although jammers and even radios used for communication can also be targeted in this manner. Radar is a system that uses electromagnetic waves to identify the range altitude direction or speed of both moving and fixed objects such as Aircraft, ships
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Air-to-Ground
Most ARM designs to date have been intended for use against ground-based radars. Commonly carried by specialist aircraft in the SEAD (Suppression of Enemy Air Defense) role (known to the USAF as "Wild Weasels"), the primary purpose of this type of missile is to degrade enemy air defences in the first period of a conflict in order to increase the chances of survival for the following waves of strike aircraft. SEAD (pronounced see-add or seed or Suppression of Enemy Air Defences, also known as " Wild Weasels quot and "Iron Hand" operations in the USA are Wild Weasel is a nickname for aircraft of the United States Air Force tasked with the Suppression of Enemy Air Defenses ( SEAD) mission They can also be used to quickly shut down unexpected SAM sites during a raid. A surface to air missile ( SAM) or ground-to-air missile ( GTAM) is a Missile designed to be launched from the ground to destroy Aircraft Aircraft which fly with strike aircraft to protect them from enemy air defences often also carry cluster bombs and are known as a SEAD escort. Cluster munitions or cluster bombs are air-dropped or ground-launched munitions that eject a number of smaller submunitions a cluster of bomblets SEAD (pronounced see-add or seed or Suppression of Enemy Air Defences, also known as " Wild Weasels quot and "Iron Hand" operations in the USA are The cluster bombs can be used to ensure that after the ARM disables the SAM system's radar, the command post, missile launchers, and other components or equipment are also destroyed to guarantee the SAM site stays down.
Early ARMs such as the AGM-45 Shrike were not particularly intelligent; they would simply home in on the source of radiation and explode when they got near. History The Shrike was first employed during the Vietnam War by the Navy in 1965 using A-4 aircraft Smart SAM operators learned to turn their radar off when an ARM was fired at them then turn it back on later, greatly reducing the missile's effectiveness. Radar is a system that uses electromagnetic waves to identify the range altitude direction or speed of both moving and fixed objects such as Aircraft, ships This led to the development of more advanced ARMs like the AGM-78 Standard ARM and AGM-88 HARM missiles, which have inertial guidance systems (INS) built-in. The AGM-78 Standard ARM was a missile developed by General Dynamics, United States of America. Gulf War Friendly Fire Incident During the Gulf War, the HARM was involved in a friendly fire incident when the pilot of an F-4G Wild Weasel escorting An Inertial Navigation System (INS is a Navigation aid that uses a Computer and motion sensors to continuously track the position orientation and Velocity This allows them to "remember" the radar's location if it is turned off and continue to home into it. It is less likely to hit the radar if it is turned off quickly, as the longer the radar is off (and assuming it never turns back on), the more error is introduced into the missile's course. However, the high speed and smokeless motors of the more recent missiles (such as the HARM) mean that they will probably close the distance significantly before anyone even realizes one has been fired. Gulf War Friendly Fire Incident During the Gulf War, the HARM was involved in a friendly fire incident when the pilot of an F-4G Wild Weasel escorting This gives the missile a much higher probability of destroying the radar even in this circumstance. In any case, even a temporary shut down of the enemy's missile guidance radar can be of a great advantage to friendly aircraft during battle.
The British ALARM has the ability to loiter: a parachute allows it to slow its descent until the radar reactivates. ALARM ( Air Launched Anti-Radiation Missile) is a British Anti-radiation missile designed primarily to destroy enemy radars for the purpose of The AGM-136 Tacit Rainbow (an American missile) would have operated in the same way. The AGM-136A Tacit Rainbow was a United States military Anti-radiation missile program run from 1982 to 1991 This was a small, air launched cruise missile, which could be fired either at a transmitting radar, or an area in which SAM radars are believed to be hiding. In the event of the radar deactivating, the Tacit Rainbow would loiter, using its small jet engine, until the radar reappeared – a Persistent Anti-radiation Missile. The project was cancelled in 1991, for budget reasons.
Another design point of modern ARM missiles, other than the range (which is hopefully greater than that of the SAM systems it will be targeted at), is their speed. Some SAM systems utilize huge missiles which are able to accelerate up to incredible speeds (some as high as Mach 6), which means that if the ARM is to be useful in a "duel" between an aircraft and a SAM site, the ARM should be able to fly to and hit the SAM site faster than the SAM can fly to and hit the aircraft. Mach number (\mathrm{Ma} or M (generally ˈmɑːk sometimes /ˈmɑːx/ or /ˈmæk/ is the speed of an object moving through air or any Fluid The AGM-88 HARM mostly succeeds in this area; its top speed of around Mach 4 is partly due to its altitude and speed advantage at launch over the SAM (which has to climb from rest at ground level), and partly due to its powerful rocket motor. Gulf War Friendly Fire Incident During the Gulf War, the HARM was involved in a friendly fire incident when the pilot of an F-4G Wild Weasel escorting Mach number (\mathrm{Ma} or M (generally ˈmɑːk sometimes /ˈmɑːx/ or /ˈmæk/ is the speed of an object moving through air or any Fluid This means that if the SAM launches a missile at the aircraft first, unless it is one of the fastest SAM systems such as the SA-10/S-300 or SA-20/S-400, the aircraft is likely to win.
Surface-to-Surface
Several surface-to-surface missiles, like the P-700 Granit, P-500 Bazalt, MM40 Exocet and OTO Melara Teseo include a home-on-jam capability wherein the receiver component of their active radar seeker is used to home in on enemy radar, ECM or communications. A surface-to-surface missile (also ground-to-ground missile, SSM or GTGM) is a guided projectile launched from a hand-held vehicle mounted trailer mounted The P-700 Granit (П-700 "Гранит" Granite) is a Soviet and Russian naval anti-ship missile. The P-500 Bazalt (П-500 «Базальт» Basalt) is a liquid-fueled rocket powered supersonic Cruise missile used by the Soviet and The Exocet is a French -built Anti-ship missile whose various versions can be launched from surface vessels submarines and airplanes This makes these missiles significantly harder to defeat with ECM and distraction countermeasures, and makes the use of semi-active missiles against them dangerous. Semi-active radar homing, or SARH, is a common type of Missile guidance system perhaps the most common type for longer range air-to-air and Surface-to-air
Surface-to-Air
Due to experiences with jamming during Vietnam and Middle Eastern wars in late 1960s by US-built aircraft, the Soviets have designed an alternative guidance mode for their S-75 (SA-2) missiles, which allowed them to home onto the source of the jamming if normal forms of navigation failed. In cases of heavy jamming, missiles were often launched exclusively in this mode, ironically because passive tracking allowed the SAM operators to prevent American anti-radiation missiles from being fired at them in retaliation. Recently, The People's Republic of China developed the FT-2000 system to counter AEW and AWACS targets, based on the HQ-9 which is in turn based on the S-300PMU. The anti-radiation missile systems has been marketed to Pakistan and various countries, without success.
Air-to-Air
More recently, air-to-air ARM designs have begun to appear, notably the Russian Vympel R-27P. The Vympel R-27 ( NATO reporting name AA-10 Alamo, Cyrillic P-27) is a medium-range Air-to-air missile developed by the Soviet Such missiles have several advantages over other missile guidance techniques; they do not trigger radar warning receivers (conferring a measure of surprise), and they can have a longer range (since battery life of the seeker head is the limiting factor on the range of most active radar homing systems. Active radar homing is a Missile guidance method in which a Guided missile contains a Radar Transceiver and the electronics necessary for it
The American-made AIM-120 AMRAAM air-to-air missile seeks out electronic jamming countermeasures to improve end-stage performance, its so-called "home on jam" capability. The AIM-120 Advanced Medium-Range Air-to-Air Missile, or AMRAAM (pronounced am-ram is a modern Beyond Visual Range (BVR air-to-air Missile However, this anti-radiation mode is not the exclusive means of guidance of the unit.
References
Reuben Johnson. "Improved Russian radar may level playing field", Asian Aerospace, 2006-02. Retrieved on 2006-07-10. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 48 BC - Battle of Dyrrhachium, Julius Caesar barely avoids a catastrophic defeat to Pompey in Macedonia.
http://www.pakdef.info/pakmilitary/army/sam/sa2guideline.html
http://pvo.guns.ru/s75/s75_combat.htm (in Russian)
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