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56-503: The Metis-M / Metis-M1 system adds to the usual positive qualities of a man-portable anti-tank guided missile with significant improvements in range, accuracy and lethality. Owing to the small dimensions and light weight of its components, this manportable system can be carried by its crew in compact packs over any distance and over a wide variety of terrain types, including stream crossing. The three-man crew carries personal weapons and an ammunition load of five missiles. One crew member carries

112-400: A reference , SLBMs are launched from moving submarines, which complicates the necessary navigational calculations and increases circular error probable . Stellar-inertial guidance is used to correct small position and velocity errors that result from launch condition uncertainties due to errors in the submarine navigation system and errors that may have accumulated in the guidance system during

168-423: A video camera , typically black and white, to image a field of view in front of the missile, which is presented to the operator. When launched, the electronics in the missile look for the spot on the image where the contrast changes the fastest, both vertically and horizontally, and then attempts to keep that spot at a constant location in its view. Contrast seekers have been used for air-to-ground missiles, including

224-442: A completely separate source (frequently troops on the ground equipped with the appropriate laser designator). Infrared homing is a passive system that homes in on the heat generated by the target. Typically used in the anti-aircraft role to track the heat of jet engines, it has also been used in the anti-vehicle role with some success. This means of guidance is sometimes also referred to as "heat seeking". Contrast seekers use

280-612: A missile using preset guidance is the V-2 rocket . Inertial guidance uses sensitive measurement devices to calculate the location of the missile due to the acceleration put on it after leaving a known position. Early mechanical systems were not very accurate, and required some sort of external adjustment to allow them to hit targets even the size of a city. Modern systems use solid state ring laser gyros that are accurate to within metres over ranges of 10,000 km, and no longer require additional inputs. Gyroscope development has culminated in

336-407: A moving or fixed target, whereas a GOLIS weapon is limited to a stationary or near-stationary target. The trajectory that a missile takes while attacking a moving target is dependent upon the movement of the target. A moving target can be an immediate threat to the missile launcher. The target must be promptly eliminated in order to preserve the launcher. In GOLIS systems, the problem is simpler because

392-456: A pack with a missile-loaded launcher, which considerably reduces the time of fire preparation and allows the crew to engage targets whilst moving. In the event of sudden appearance of a target, the operator can fire from the shoulder with the launcher rested against a local object. The two other crew members each carry a pack with two missiles. The Metis-M / Metis-M1 ATGM system has a semi-automatic missile guidance , with commands transmitted over

448-453: A potentially very effective means of improving accuracy. In the Trident missile system this was achieved by a single camera that was trained to spot just one star in its expected position (it is believed that the missiles from Soviet submarines would track two separate stars to achieve this), if it was not quite aligned to where it should be then this would indicate that the inertial system

504-400: A rate proportional to the rotation rate of the line of sight (line-Of-sight rate or LOS-rate) and in the same direction. Active homing uses a radar system on the missile to provide a guidance signal. Typically, electronics in the missile keep the radar pointed directly at the target, and the missile then looks at this "angle" of its own centerline to guide itself. Radar resolution is based on

560-509: A separate system for the ill-fated AGM-48 Skybolt missile, the latter of which was adapted for the SR-71 . It uses star positioning to fine-tune the accuracy of the inertial guidance system after launch. As the accuracy of a missile is dependent upon the guidance system knowing the exact position of the missile at any given moment during its flight, the fact that stars are a fixed reference point from which to calculate that position makes this

616-403: A system without a target tracker. The other two units are on board the missile. These systems are also known as self-contained guidance systems; however, they are not always entirely autonomous due to the missile trackers used. They are subdivided by their missile tracker's function as follows: Preset guidance is the simplest type of missile guidance. From the distance and direction of the target,

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672-689: A weapon operated by 2 soldiers. However, between 2009 and 2011, South Korean Army fired 17 missiles for testing, and 10 missiles either missed the target or didn't ignite the warhead upon impact (60% failure). After temporarily removing Metis-M from active service, the Army, the Agency for Defense Development , and the Defense Acquisition Program Administration test fired 43 missiles and achieved 41 hits (7% failure). The joint inspection team hypothesized faulty electronics on

728-542: A wire link. The guidance system is constructed so that the most sophisticated and costly components, such as a gyroscopic coordinator, electronic units and an onboard battery, are excluded from the missile. The Metis-M system comprises: The combat assets of the Metis-M system include: Metis-M1 is the upgraded variant of Metis-M. The new version has greater range of two kilometres (1.2 mi), more armor penetration of 900–980 mm (35–39 in), and reduced weight. It

784-487: Is a critical factor for its effectiveness. Guidance systems improve missile accuracy by improving its Probability of Guidance (Pg). These guidance technologies can generally be divided up into a number of categories, with the broadest categories being "active", "passive", and "preset" guidance. Missiles and guided bombs generally use similar types of guidance system, the difference between the two being that missiles are powered by an onboard engine, whereas guided bombs rely on

840-482: Is always commanded to lie on the line of sight (LOS) between the tracking unit and the aircraft is known as command to line of sight (CLOS) or three-point guidance. That is, the missile is controlled to stay as close as possible on the LOS to the target after missile capture is used to transmit guidance signals from a ground controller to the missile. More specifically, if the beam acceleration is taken into account and added to

896-417: Is an important distinction, as the nature of the signal differs, and is used as a cue for evasive action. LOSBR suffers from the inherent weakness of inaccuracy with increasing range as the beam spreads out. Laser beam riders are more accurate in this regard, but they are all short-range, and even the laser can be degraded by bad weather. On the other hand, SARH becomes more accurate with decreasing distance to

952-497: Is assisted by a COLOS system via radar link provided by the AN/SPY-1 radar installed in the launching platform. LOSBR uses a "beam" of some sort, typically radio , radar or laser , which is pointed at the target and detectors on the rear of the missile keep it centered in the beam. Beam riding systems are often SACLOS , but do not have to be; in other systems the beam is part of an automated radar tracking system. A case in point

1008-554: Is being supplanted by GPS systems and by DSMAC , digital scene-matching area correlator, which employs a camera to view an area of land, digitizes the view, and compares it to stored scenes in an onboard computer to guide the missile to its target. DSMAC is reputed to be so lacking in robustness that destruction of prominent buildings marked in the system's internal map (such as by a preceding cruise missile) upsets its navigation. Project Pigeon During World War II, Project Pigeon (later Project Orcon , for "organic control")

1064-403: Is designed to destroy main battle tanks with Active Protection Systems and Explosive Reactive Armor (ERA), light armored vehicles, fortifications, and other targets in day or night and in any weather condition. In 2013, Bangladesh Army received large amount of Metis-M1 anti-tank missile systems along with 1200 missiles. In November 2015, Russia revealed it was formalizing the introduction of

1120-586: Is the later versions of the RIM-8 Talos missile as used in Vietnam ;– the radar beam was used to take the missile on a high arcing flight and then gradually brought down in the vertical plane of the target aircraft, the more accurate SARH homing being used at the last moment for the actual strike. This gave the enemy pilot the least possible warning that his aircraft was being illuminated by missile guidance radar, as opposed to search radar. This

1176-502: The AGM-65 Maverick , because most ground targets can be distinguished only by visual means. However they rely on there being strong contrast changes to track, and even traditional camouflage can render them unable to "lock on". Retransmission homing, also called " track-via-missile " or "TVM", is a hybrid between command guidance , semi-active radar homing and active radar homing . The missile picks up radiation broadcast by

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1232-554: The AIRS found on the MX missile, allowing for an accuracy of less than 100 m at intercontinental ranges. Many civilian aircraft use inertial guidance using a ring laser gyroscope, which is less accurate than the mechanical systems found in ICBMs, but which provide an inexpensive means of attaining a fairly accurate fix on location (when most airliners such as Boeing's 707 and 747 were designed, GPS

1288-672: The Metis-M1 and entered service with Russia on March 2, 2016. According to accounts by the Israel Defense Forces concerning weapons seized from Hezbollah and from journalists' accounts from Lebanon, the Metis-M was used successfully by Hezbollah fighters during the 2006 Lebanon war against Merkava tanks. Israel has sent a team of officials to Moscow to show the Russians the evidence of what they say can only be Syrian weapons transfers. To date, Russia has not commented on

1344-409: The angular coordinates between the missile and the target to ensure the collision. The missile is made to be in the line of sight between the launcher and the target (LOS), and any deviation of the missile from this line is corrected. Since so many types of missile use this guidance system, they are usually subdivided into four groups: A particular type of command guidance and navigation where the missile

1400-456: The center of the screen, the screen would not move, but if the bomb began to go off track, the image would move towards the edge of the screen. The pigeons would follow the image, pecking at it, which would move the screen on its pivots. In the case where two possible targets were on the screen, Skinner noted that at least two of the birds would be in agreement and the third would be "punished for his minority opinion" to encourage it to steer towards

1456-442: The course and keep the bomb on its glide path. Early electronic guidance systems use similar methods, only with electronic signals and processors replacing the birds in detecting the target and preventing deviation from the glide path. The National Defense Research Committee saw the idea to use pigeons in glide bombs as very eccentric and impractical, but still contributed $ 25,000 to the research. Skinner, who had some success with

1512-408: The disadvantage for air-launched systems that the launch aircraft must keep moving towards the target in order to maintain radar and guidance lock. This has the potential to bring the aircraft within range of shorter-ranged IR-guided (infrared-guided) missile systems. It is an important consideration now that "all aspect" IR missiles are capable of "kills" from head on, something which did not prevail in

1568-423: The early days of guided missiles. For ships and mobile or fixed ground-based systems, this is irrelevant as the speed (and often size) of the launch platform precludes "running away" from the target or opening the range so as to make the enemy attack fail. SALH is similar to SARH but uses a laser as a signal. Another difference is that most laser-guided weapons employ turret-mounted laser designators which increase

1624-468: The flight due to imperfect instrument calibration . The USAF sought a precision navigation system for maintaining route accuracy and target tracking at very high speeds. Nortronics , Northrop 's electronics development division, had developed an astro-inertial navigation system (ANS), which could correct inertial navigation errors with celestial observations , for the SM-62 Snark missile, and

1680-630: The guiding system or failing to maintain in good custody. However, they were not able to identify the cause of the issue, and Metis-M was put back into active service. On 7 March 2012, Free Syrian Army fighters used a 9K115-2 Metis-M anti-tank guided missile to hit a derelict Syrian Air Force MiG-23MS. Later during the Syrian Civil War , its use became widespread. Insurgents used it with great success, together with other ATGMs, against different targets, including tanks, infantry fighting vehicles, trucks and firing posts with many videos uploaded on to

1736-501: The interception of the target by the missile by locating both in space. This means that they will not rely on the angular coordinates like in CLOS systems. They will need another coordinate which is distance. To make it possible, both target and missile trackers have to be active. They are always automatic and the radar has been used as the only sensor in these systems. The SM-2MR Standard is inertially guided during its mid-course phase, but it

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1792-485: The internet. Initially, Metis missiles originated from looted Syrian Army depots, while later external suppliers could have been involved. It was confirmed that Bulgaria has sold 6 sets of 9K115-2 Metis via the United States to Syrian rebels. Missile guidance Missile guidance refers to a variety of methods of guiding a missile or a guided bomb to its intended target. The missile's target accuracy

1848-442: The launching aircraft's ability to maneuver after launch. How much maneuvering can be done by the guiding aircraft depends on the turret field of view and the system's ability to maintain a lock-on while maneuvering. As most air-launched, laser-guided munitions are employed against surface targets the designator providing the guidance to the missile need not be the launching aircraft; designation can be provided by another aircraft or by

1904-457: The mechanism used in a go-onto-location-in-space guidance system is, it must contain preset information about the target. These systems' main characteristic is the lack of a target tracker. The guidance computer and the missile tracker are located in the missile. The lack of target tracking in GOLIS necessarily implies navigational guidance. Navigational guidance is any type of guidance executed by

1960-472: The missile flight, and uses a signaling system to command the missile back into the straight line between operator and target (the "line of sight"). This is typically useful only for slower targets, where significant "lead" is not required. MCLOS is a subtype of command guided systems. In the case of glide bombs or missiles against ships or the supersonic Wasserfall against slow-moving B-17 Flying Fortress bombers this system worked, but as speeds increased MCLOS

2016-468: The nominal acceleration generated by the beam-rider equations, then CLOS guidance results. Thus, the beam rider acceleration command is modified to include an extra term. The beam-riding performance described above can thus be significantly improved by taking the beam motion into account. CLOS guidance is used mostly in shortrange air defense and antitank systems. Both target tracking and missile tracking and control are performed manually. The operator watches

2072-487: The nose cone. The intent was to train pigeons to act as "pilots" for the device, using their cognitive abilities to recognize the target. The guidance system consisted of three lenses mounted in the nose of the vehicle, which projected an image of the target on a screen mounted in a small compartment inside the nose cone. This screen was mounted on pivots and fitted with sensors that measured any angular movement. One to three pigeons, trained by operant conditioning to recognize

2128-433: The relatively low precision of this guidance method is less of an issue for large nuclear warheads. Astro-inertial guidance , or stellar-inertial guidance , is a sensor fusion - information fusion of inertial guidance and celestial navigation . It is usually employed on submarine-launched ballistic missiles . Unlike silo-based intercontinental ballistic missiles , whose launch point does not move and thus can serve as

2184-497: The reliability of electronic guidance systems was proven. Skinner was awarded the 2024 Ig Nobel Peace Prize for his work on the project; his daughter Julie Vargas , who received the award in his stead, is quoted as saying, "I want to thank you for finally acknowledging his most important contribution. People know him only for discovering operant conditioning , schedules of reinforcement , and for books like Walden Two , Verbal Behavior , Beyond Freedom D , and more. Even

2240-505: The size of the antenna, so in a smaller missile these systems are useful for attacking only large targets, ships or large bombers for instance. Active radar systems remain in widespread use in anti-shipping missiles, and in " fire-and-forget " air-to-air missile systems such as the AIM-120 AMRAAM and R-77 . Semi-active homing systems combine a passive radar receiver on the missile with a separate targeting radar that "illuminates"

2296-500: The speed and height of the launch aircraft for propulsion. The concept of unmanned guidance originated at least as early as World War I, with the idea of remotely guiding an airplane bomb onto a target, such as the systems developed for the first powered drones by Archibald Low (the father of radio guidance). In World War II, guided missiles were first developed, as part of the German V-weapons program. Project Pigeon

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2352-509: The target is not moving. In every go-onto-target system there are three subsystems: The way these three subsystems are distributed between the missile and the launcher result in two different categories: These guidance systems usually need the use of radars and a radio or wired link between the control point and the missile; in other words, the trajectory is controlled with the information transmitted via radio or wire (see Wire-guided missile ). These systems include: The CLOS system uses only

2408-400: The target preferred by the majority of the pigeons. The sensors would detect the movement and send signals to the control surfaces, which would steer the bomb in the direction the screen had moved. As the bomb swung back towards the target, the pigeons would again follow the image, bringing the screen back to the centered position again. In that way, the pigeons would correct any deviations in

2464-439: The target, so the two systems are complementary. Proportional navigation (also known as "PN" or "Pro-Nav") is a guidance principle (analogous to proportional control ) used in some form or another by most homing air target missiles . It is based on the fact that two objects are on a collision course when the direction of their direct line-of-sight does not change. PN dictates that the missile velocity vector should rotate at

2520-407: The target, were stationed in front of the screen; when they saw the target, they would peck at the screen with their beaks. They were trained by being shown an image of the target and gradually more and more rapid pecks were required for a grain of food. One bird pecked more than 10,000 times in 45 minutes (Note 2/20/89 BFSkinner Foundation and author's collection.) U As long as the target remained in

2576-436: The target. Since the missile is typically being launched after the target was detected using a powerful radar system, it makes sense to use that same radar system to track the target, thereby avoiding problems with resolution or power, and reducing the weight of the missile. Semi-active radar homing (SARH) is by far the most common "all weather" guidance solution for anti-aircraft systems, both ground- and air-launched. It has

2632-478: The tracking radar which bounces off the target and relays it to the tracking station, which relays commands back to the missile. In 2017, Russian weapons manufacturer Tactical Missiles Corporation announced that it was developing missiles that would use artificial intelligence to choose their own targets. In 2019, the United States Army announced it was developing a similar technology. Whatever

2688-530: The training, complained: "our problem was no one would take us seriously". The program was canceled on 8 October 1944, because the military believed that "further prosecution of this project would seriously delay others which in the minds of the Division have more immediate promise of combat application". Project Pigeon was briefly revived by the Navy in 1948 as "Project Orcon," but it was again cancelled in 1953 when

2744-401: The trajectory of the flight path is determined. Before firing, this information is programmed into the missile's guidance system, which, during flight, maneuvers the missile to follow that path. All of the guidance components (including sensors such as accelerometers or gyroscopes ) are contained within the missile, and no outside information (such as radio instructions) is used. An example of

2800-463: The user, as well as generally being considerably easier to operate. It is the most common form of guidance against ground targets such as tanks and bunkers. Target tracking, missile tracking and control are automatic. This guidance system was one of the first to be used and still is in service, mainly in anti-aircraft missiles. In this system, the target tracker and the missile tracker can be oriented in different directions. The guidance system ensures

2856-412: The weapon proliferation, although it has moved to tighten control over the use of Russian-made weapons by the importing states. South Korea purchased a total of 220 Metis-M in two orders—70 in 1995 (Project Brown Bear I) and 150 in 2005 (Project Brown Bear II)—and acquired 9,000 missiles as of 2006. According to the tests, Metis-M was capable of penetrating 850 mm of RHA, providing great firepower for

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2912-465: Was American behaviorist B. F. Skinner 's attempt to develop a pigeon -controlled guided bomb . The testbed was the same National Bureau of Standards -developed, unpowered airframe that was later used for the US Navy's radar-guided "Bat" glide bomb , which was basically a small glider, with wings and tail surfaces, an explosive warhead section in the center, and a "guidance section" in

2968-504: Was American behaviorist B.F. Skinner 's attempt to develop a pigeon-guided bomb. The first U.S. ballistic missile with a highly accurate inertial guidance system was the short-range PGM-11 Redstone . Guidance systems are divided into different categories according to whether they are designed to attack fixed or moving targets. The weapons can be divided into two broad categories: Go-onto-target (GOT) and go-onto-location-in-space (GOLIS) guidance systems. A GOT missile can target either

3024-451: Was not precisely on target and a correction would be made. TERCOM , for "terrain contour matching", uses altitude maps of the strip of land from the launch site to the target, and compares them with information from a radar altimeter on board. More sophisticated TERCOM systems allow the missile to fly a complex route over a full 3D map, instead of flying directly to the target. TERCOM is the typical system for cruise missile guidance, but

3080-431: Was not the widely commercially available means of tracking that it is today). Today guided weapons can use a combination of INS, GPS and radar terrain mapping to achieve extremely high levels of accuracy such as that found in modern cruise missiles. Inertial guidance is most favored for the initial guidance and reentry vehicles of strategic missiles , because it has no external signal and cannot be jammed . Additionally,

3136-420: Was quickly rendered useless for most roles. Target tracking is automatic, while missile tracking and control is manual. Target tracking is manual, but missile tracking and control is automatic. It is similar to MCLOS but some automatic systems position the missile in the line of sight while the operator simply tracks the target. SACLOS has the advantage of allowing the missile to start in a position invisible to

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