SONAR also known as SOund Navigation And Ranging, a technique that requires sound propagation underwater (generally) to navigate, communicate or to detect other vessels.
There are two kinds of sonar that are known as active sonar and passive sonar. Sonar can be used as a means of acoustic location as well. Radar used acoustic location in air, while sonar used in air for robot navigation. SODAR, on the other hand is used for atmospheric investigation.
The term "SONAR" is used for the equipment used to generate the sound and received the echo sound that bounces back. The frequencies used in the sonar systems vary from infrasonic to ultrasonic. Hydroacoustics can be also known as the study of underwater sound.
Principle of an Active Sonar - Send and Return Pings
Although during early history, animals such as dolphins and whales use sound for communication and object detection, and the use by human is first recorded by Leornado Da Vinci in 1490. It is said that, a tube is inserted into the water was used to detect vessels by placing an ear to the tube.
How Sonar Works
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