- Precision-guided munition
Precision-guided munitions (PGMs, smart munitions, smart bombs, guided bomb units or GBUs) are guided weapons intended to maximize damage to the target while minimizing civilian damage. Because the damage effects of an
explosive weaponfall off with distance according to a power law, even modest improvements in accuracy (and hence reduction in miss distance) enable a target to be effectively attacked with fewer or smaller bombs. Thus, even if some bombs miss, fewer air crews are put at risk and the harm to civilians is somewhat reduced. The creation of precision-guided munitions resulted in the renaming of older bombs as " gravity bombs", "dumb bombs" or "iron bombs".
Types of precision-guided ammunition
Recognizing the difficulty of hitting moving ships during the
Spanish Civil War, [Fitzsimons, Bernard, editor. "The Illustrated Encyclopedia of 20th Century Weapons and Warfare" (London: Phoebus, 1978), Volume 10, p.1037, "Fritz-X".] the Germans were first to develop steerable munitions, using radio controlor wire guidance. The U.S. tested TV-guided ( GB-4), [Fitzsimons, "op. cit.", Volume 10, p.1101, "GB-4".] semi-active radar-guided (Bat), and infrared-guided (Felix) weapons.
The Germans were first to introduce PGMs in combat, using the 1,400-kg (3,100 lb)
Fritz Xto successfully attack the Italian battleship"Roma" in 1943. The closest Allied equivalents were the 1000-lb (450 kg) AZON(AZimuth ONly), used in both Europe and the Pacific, and the US Navy's Bat, primarily used in the Pacific Theater of WW II. In addition, the U.S. tested the rocket-propelled Gargoyle; it never entered service. [Fitzsimons, "op. cit.", Volume 10, p.1090, "Gargoyle".]
United States Army Air Forceexperimented with radio-controlled remotely guided planes in Operation Aphrodite, but had few successes; the German Mistel(Mistletoe) "parasite aircraft" was no more effective.
The U.S. programs restarted in the
Korean War, where nuclear war would have been unthinkable. In the 1960s, the "electro-optical bomb" (or "camera bomb") was reintroduced. They were equipped with television cameras and flare sights, by which the bomb would be steered until the flare superimposed the target. The camera bombs transmitted a "bomb's eye view" of the target back to a controlling aircraft. An operator in this aircraft then transmitted control signals to steerable fins fitted to the bomb. Such weapons were used increasingly by the USAFin the last few years of the Vietnam Warbecause the political climate was increasingly intolerant of civilian casualties, and because it was possible to strike difficult targets (such as bridges) effectively with a single mission; the Thanh Hoa Bridge, for instance, was attacked repeatedly with iron bombs, to no effect, only to be dropped in one mission with PGMs.
Although not as popular as the newer
JDAMand JSOWweapons, or even the older Laser-guided bombsystems, weapons like the AGM-62 WalleyeTV-guided bomb are still being used, in conjunction with the AAW-144Data Link Pod, on US Navy F/A-18Hornets.
In World War Two, the U.S.
National Defense Research Committeedeveloped the VB-6 Felix, which used infrared to home on ships. While it entered production in 1945, it was never employed operationally. [Fitzsimons, "op. cit.", Volume 9, p.926, "Felix".]
In 1962, the US Army began research into
laserguidance systems and by 1967 the USAF had conducted a competitive evaluation leading to full development of the world's first laser-guided bomb, the BOLT-117, in 1968. All such bombs work in much the same way, relying on the target being illuminated, or "painted," by a laser target designator on the ground or on an aircraft. They have the significant disadvantage of not being usable in poor weather where the target illumination cannot be seen, or where it is not possible to get a target designator near the target. The laser designator sends its beam in a series of encrypted pulses so the bomb cannot be confused by an ordinary laser, and also so multiple designators can operate in reasonable proximity.
Laser-guided weapons did not become commonplace until the advent of the microchip. They made their practical debut in Vietnam, where on 13 May 1972 when they were used in the second successful attack on the Thanh Hoa Bridge ("Dragon's Jaw"). This structure had previously been the target of 800 American sorties [ [http://www.mn.afrl.af.mil/public/vietnam.html Thanh Hoa Bridge] ] (using unguided weapons) and was partially destroyed in each of two successful attacks, the other being on 27 April 1972 using Walleyes. That first mission also had laser-guided weapons, but bad weather prevented their use. They were used, though not on a large scale, by the British forces during the 1982
Falklands War. [ [http://www.britains-smallwars.com/Falklands/air-war.htm Britain's Small Wars] ] The first large-scale use of smart weapons came in 1991 during Operation Desert Stormwhen they were used by coalition forces against Iraq. Even so, most of the air-dropped ordnance used in that war was "dumb," although the percentages are biased by the large use of various (unguided) cluster bombs. Laser-guided weapons were used in large numbers during the 1999 Kosovo War, but their effectiveness was often reduced by the poor weather conditions prevalent in the southern Balkans.
There are two basic families of laser-guided bombs in American (and American-sphere) service: the
PavewayII and the Paveway III. The Paveway III guidance system is more aerodynamically efficient and so has a longer range, however it is more expensive. Paveway II 500-pound LGBs (such as GBU-12) are a cheaper lightweight PGM suitable for use against vehicles and other small targets, while a Paveway III 2000-pound penetrator (such as GBU-24) is a more expensive weapon suitable for use against high-value targets. GBU-12s were used to great effect in the first Gulf War, dropped from F-111F aircraft to destroy Iraqi armored vehicles in a process referred to as "tank plinking."
Radar/Infrared/IR Imaging/Electro-Optical Guided Weapons
Precision guidance has been applied to weapons other than conventional bomb warheads. The
RaytheonMaverick heavy anti-tank missile has among its various marks guidance systems such as electro-optical (AGM-65A), imaging infra-red (AGM-65D), and laser homing (AGM-65E). [ [http://www.raytheon.com/products/stellent/groups/public/documents/content/cms01_055755.pdf Raytheon AGM-65 Maverick] ] The first two, by guiding themselves based on the visual or IR scene of the target, are fire-and-forgetin that the pilot can release the weapon and it will guide itself to the target without further input, which allows the delivery aircraft to escape return fire.
Hellfire IIlight-weight anti-tank weapon in one mark uses the radar on the BoeingAH-64D Apache Longbow to provide fire-and-forget guidance for that weapon.
Lessons learned during the first Gulf War showed the value of precision munitions, yet they also highlighted the difficulties in employing them — specifically when visibility of the ground or target from the air was degraded. [ [http://www.af.mil/news/story.asp?storyID=123017613 JDAM continues to be warfighter's weapon of choice] ] The problem of poor visibility does not affect satellite-guided weapons such as
Joint Direct Attack Munition(JDAM) and Joint Stand-Off Weapon(JSOW), which make use the United States' GPSsystem for guidance. This weapon can be employed in all weather conditions, without any need for ground support. Because it is possible to jam GPS, the guidance package reverts to inertial navigationin the event of GPS signal loss. Inertial navigation is significantly less accurate; the JDAM achieves a published Circular Error Probable (CEP) of 13 m under GPS guidance, but typically only 30m under inertial guidance (with free fall times of 100 seconds or less). [U.S. Air Force [http://www.af.mil/factsheets/factsheet.asp?fsID=108 Factsheets: Joint Direct Attack Munition] ] [ [http://www.globalsecurity.org/military/systems/munitions/jdam-specs.htm JDAM Specifications] ]
The precision of these weapons is dependent both on the precision of the measurement system used for location determination and the precision in setting the coordinates of the target. The latter critically depends on intelligence information, not all of which is accurate. According to a CIA report, the accidental bombing of the Chinese embassy in Belgrade during
Operation Allied Forceby NATO aircraft was attributed to faulty target information. [ [https://www.cia.gov/cia/public_affairs/speeches/1999/dci_speech_072299.html DCI Statement on the Belgrade Chinese Embassy] ] However, if the targeting information "is" accurate, satellite-guided weapons are significantly more likely to achieve a successful strike in any given weather conditions than any other type of precision-guided munition.
Advanced guidance concepts
Responding to after-action reports from pilots who employed laser and/or satellite guided weapons,
Boeinghas developed a Laser JDAM (LJDAM) to provide both types of guidance in a single kit. Based on the existing JDAM configurations, a laser guidance package is added to a GPS/INS guided weapon to increase the overall accuracy of the weapons. [ [http://www.boeing.com/defense-space/missiles/jdam/docs/laser_jdam_overview.pdf Boeing Laser JDAM] ] Raytheon has developed the Enhanced Paveway family, which adds GPS/INS guidance to their Paveway family of laser-guidance packages. [ [http://www.raytheon.com/products/stellent/groups/public/documents/content/cms01_055758.pdf Raytheon Enhanced Paveway] ] These "hybrid" laser and GPS guided weapons permit the carriage of fewer weapons types, while retaining mission flexibility, because these weapons can be employed equally against moving and fixed targets, or targets of opportunity. For instance, a typical weapons load on an F-16 flying in the Iraq Warincluded a single 2,000-lb JDAM and two 1000-lb LGBs. With LJDAM, and the new Small Diameter Bomb, these same aircraft can carry more bombs if necessary, and have the option of satellite or laser guidance for each weapon release.
Circular error probable
Joint Direct Attack Munition
Strix mortar round
* [http://science.howstuffworks.com/smart-bomb.htm How Smart Bombs Work]
* [http://www.tfcbooks.com/articles/tws10.htm A Brief History of Precision Guided Weapons]
* [http://news.bbc.co.uk/1/hi/world/middle_east/1184086.stm "Smart bombs" missed Iraqi targets] BBC story on the first employment of the JSOW, guidance failures were attributed to a software error that was subsequently fixed.
* [http://news.bbc.co.uk/2/hi/americas/2805775.stm "Fact File: Smart Bombs - not so Smart] BBC story discussing the limitations of guided munition employment.
* [http://www.janes.com/defence/air_forces/news/misc/misc060817_1_n.shtml Ukraine develops indigenous guided airborne weapons] Article about Ukrainian guided bomb development, August 2006
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