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Sonar, standing for SOund Navigation And Ranging, is a technique that uses sound propagation (usually underwater) to navigate, communicate with or detect objects on or under the surface of the water. Two types of technology share the term sonar, passive sonar is usually the listening for sounds made by vessels, whereas active sonar is the emitting of pulses of sounds more

Sonar, standing for SOund Navigation And Ranging, is a technique that uses sound propagation (usually underwater) to navigate, communicate with or detect objects on or under the surface of the water. Two types of technology share the term sonar, passive sonar is usually the listening for sounds made by vessels, whereas active sonar is the emitting of pulses of sounds and listening for echoes. Sonar may be used as a means of acoustic location and of measurement of the echo characteristics of certain targets in the water. Sonar may also be used in the air for robot navigation.

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