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Sigma KEE - BeamRidingGMissile
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束騎導彈
Beam-riding guidance leads a missile to its target by means of radar or a laser beam. It is one of the simplest forms of radar or laser guidance. The main use of this kind of system is to destroy airplanes or tanks. First, an aiming station (possibly mounted in a vehicle) in the launching area directs a narrow radar or laser beam at the enemy aircraft or tank. Then, the missile is launched and at some point after launch is gathered by the radar or laser beam when it flies into it. From this stage onwards, the missile attempts to keep itself inside the beam, while the aiming station keeps the beam pointing at the target. The missile, controlled by a computer inside it, rides the beam to the target. The aiming station can also use the radar returns of the beam bouncing off the target to track it, or it can be tracked optically or by some other means. (from Wikipedia)
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Parents 導彈 Missiles that have the ability to maneuver through the air can be guided, and are known as guided missiles. These have three key system components: * tracking * guidance * flight A tracking system locates the missile's target. This can be either a human gunner aiming a sight on the target (remotely from the missile) or an automatic tracker. Automatic trackers use radiation emanating from the target or emitted from the launch platform and reflecting back to it from the target. Passive automatic trackers use the target's inherent radiation, usually heat or light, but missiles designed to attack Command & Control posts, aircraft or guided missiles may look for radio waves. Active automatic trackers rely on the target being illuminated by radiation. The target can be painted with light (sometimes infrared and/or laser) or radio waves (radar) which can be detected by the missile. The radiation for the painting can originate in the missile itself or may come from a remote station (for example, a hilltop gunner can illuminate a target with a laser device and this can be used to direct an air launched guided missile). A guidance system takes data from the missile's tracking system and flight system and computes a flight path for the missile designed to intercept the target. It produces commands for the flight system. The flight system causes the missile to maneuver. There are two main systems: vectored thrust (for missiles that are powered throughout the guidance phase of their flight) and aerodynamic maneuvering (wings, fins, canards, etc). There are some similarities between guided missiles and guided bombs. A guided bomb, dropped from an aircraft, is unpowered and uses aerodynamic fins for forward horizontal maneuvering while falling vertically. (from Wikipedia)
Children AG m114AGM-114 Hellfire (Helicopter launched fire-and-forget) is a U.S. air-to-ground missile system designed to defeat tanks and other individual targets while minimizing the exposure of the launch vehicle to enemy fire. Hellfire uses laser guidance and is designed to accept other guidance packages. It is used on helicopters against heavily armored vehicles at longer standoff distances than any other U.S. Army missiles now in the inventory. The Hellfire II is the optimized version of the laser family of Hellfire missiles. The Longbow Hellfire Modular Missile System is an air-launched, radar aided, inertially guided missile that utilizes millimeter-wave radar technology. Despite the expanded acronym, most versions of the Hellfire missile are not truly fire-and-forget -- all the laser-guided versions require constant illumination or painting of the target from launch to impact. The AGM-114L is a true fire-and-forget weapon: it requires no further guidance after launch and can hit its target without the launcher being in line of sight of the target. The Hellfire (along with the Maverick and the air-launched TOW) was to be replaced by the Joint Common Missile (JCM) around 2011. The JCM was developed with a tri-mode seeker and a multi-purpose warhead that would combine the capabilities of the several Hellfire variants. In the budget for FY2006, the US Department of Defense canceled a number of projects that they felt no longer warranted continuation based on their cost effectiveness, including the JCM. Due to the U.S. military's continuing need for a proven precision-strike aviation weapon in the interim until a successor to the JCM is fielded, as well as extensive foreign sales, it is likely the Hellfire will be in service for many years. (from Wikipedia)


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