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homing guidance[′hōm·iŋ ‚gīd·əns]
A guidance system in which a missile directs itself to a target by means of a self-contained mechanism that reacts to a particular characteristic of the target.
ii. Various types of homing guidance are active homing, passive homing, and semi-active homing guidance. It is active homing guidance if the information received is in response to transmissions from the craft, semi-active homing guidance if in response to transmissions from a source other than the craft, and passive homing guidance if natural radiations from the destination are utilized. See also passive homing guidance.