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Acoustic homing
From Wikipedia, the free encyclopedia
Acoustic homing is a system which utilizes sound to guide a moving object, such as a torpedo. Acoustic homing can be designed to move either toward or away from a sound, and may also be designed to move only toward certain types of sounds to the exclusion of others.
An object can be equipped with 2 or more microphones. If a microphone receives a sound louder than that received by the other microphones, the object turns in the microphone's direction. If the object is to manoeuvre in three-dimensional space, then three microphones are needed. If only the object needs only move in two dimensions, then only two microphones are necessary.
Acoustic homing is useful in weapons, specifically torpedoes. Torpedoes can be made to move toward ships using acoustic homing.
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