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What is the basic principle of SONAR?

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In certain conditions you have experienced that you can hear your own reflected sound (as a second sound).If you shout “HELLO” the sound may bounce back at you from a large object.You hear your own voice coming back, called Echo. read more

The rst active sonar designed in the same way modern sonar is, was invented and developed as a direct conse-quence of the loss of Titanic in 1912, where the basic requirement was to detect icebergs in 2 miles distance. Underwater sound is used both by whales and dolphins (see Fig. 1) for communication and echolocation. read more

Source: uio.no

Passive sonar is a method for detecting acoustic signals in an underwater environment, usually the ocean. The difference between passive and active sonar is that a passive sonar system emits no signals; instead, its purpose is to detect the acoustic signals emanating from external sources. read more

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