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MISSILE COMPONENTS - 14023_98
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Aviation Ordinanceman 2 & 3 - Aviation theories and other practices
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Figure 3-2.—Typical air-to-surface guided missile. orders and the control system that carries them out. The elements for missile guidance and missile control can be housed in the same section of the missile, or they can be in separate sections. There are a number of basic guidance systems used in guided missiles. Homing-type, air-launched, guided missiles are currently used. They use radar or infrared homing systems. A homing guidance system is one in which the missile seeks out the target, guided by some physical indication from the target itself. Radar reflections or thermal characteristics of targets are possible physical influences on which homing systems are based. Homing systems are classified as active, semiactive, and passive. ACTIVE.— In the active homing system, target illumination is supplied by a component carried in the Figure 3-3.—Active homing system. missile, such as a radar transmitter. The radar signals (fig. 3-3) transmitted from the missile are reflected off the target back to the receiver in the missile. These reflected signals give the missile information such as the target’s distance and speed. This information lets the guidance section compute the correct angle of attack to intercept the target. The missile’s angle of attack is controlled by the control section that receives electronic commands from the guidance section. Mechanically manipulated wings, fins, or canard control surfaces are mounted externally on the body of the weapon. They are actuated by hydraulic, electric, or gas generator power, or combinations of these to alter the missile’s course. SEMIACTIVE.— In the semiactive homing system (fig. 3-4), the missile gets its target illumination from an external source, such as a transmitter carried in the launching aircraft. The receiver in the missile Figure 3-4.—Semiactive homing system. 3-5







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