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2. Sonar - Wikipedia

   en.wikipedia.org/wiki/Sonar

   Sonar (sound navigation and ranging or sonic navigation and ranging) [2] is a technique that uses sound propagation (usually underwater, as in submarine navigation ...

3. Sonar signal processing - Wikipedia

   en.wikipedia.org/wiki/Sonar_signal_processing

   Sonar systems are generally used underwater for range finding and detection. Active sonar emits an acoustic signal, or pulse of sound, into the water. The sound bounces off the target object and returns an echo to the sonar transducer. Unlike active sonar, passive sonar does not emit its own signal, which is an advantage for military vessels.

4. Underwater acoustics - Wikipedia

   en.wikipedia.org/wiki/Underwater_acoustics

   Sonar is the name given to the acoustic equivalent of radar. Pulses of sound are used to probe the sea, and the echoes are then processed to extract information about the sea, its boundaries and submerged objects. An alternative use, known as passive sonar, attempts to do the same by listening to the sounds radiated by underwater objects.

5. Acoustic location - Wikipedia

   en.wikipedia.org/wiki/Acoustic_location

   Sonar (sound navigation and ranging) is a technique that uses sound propagation under water (or occasionally in air) to navigate, communicate or to detect other vessels. There are two kinds of sonar – active and passive. A single active sonar can localize in range and bearing as well as measuring radial speed.

6. Sónar - Wikipedia

   en.wikipedia.org/wiki/Sónar

   Sónar is a festival dedicated to music, creativity and technology, founded in Barcelona in 1994 by Ricard Robles, Enric Palau, and Sergi Caballero.The festival has been divided into two parts since its inception: Sónar by Day and Sónar by Night, with a three-day congress, Sónar+D dedicated to Creativity, Technology and Business running concurrently since 2013.

7. Towed array sonar - Wikipedia

   en.wikipedia.org/wiki/Towed_array_sonar

   The DUBV 43C towed array sonar of La Motte-Picquet.. A towed array sonar is a system of hydrophones towed behind a submarine or a surface ship on a cable. [1] Trailing the hydrophones behind the vessel, on a cable that can be kilometers long, keeps the array's sensors away from the ship's own noise sources, greatly improving its signal-to-noise ratio, and hence the effectiveness of detecting ...