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2. Side-scan sonar - Wikipedia

   en.wikipedia.org/wiki/Side-scan_sonar

   Side-scan uses a sonar device that emits conical or fan-shaped pulses down toward the seafloor across a wide angle perpendicular to the path of the sensor through the water, which may be towed from a surface vessel or submarine (called a “towfish”), or mounted on the ship's hull.

3. List of British Asdic systems - Wikipedia

   en.wikipedia.org/wiki/List_of_British_Asdic_systems

   Asdic was the British version of sonar developed at the end of World War I based on the work of French physicist Paul Langevin and Russian engineer M. Constantin Chilowsky. The system was developed as a means to detect and locate submarines by their reflection of sound waves.

4. Echo sounding - Wikipedia

   en.wikipedia.org/wiki/Echo_sounding

   Echo sounding or depth sounding is the use of sonar for ranging, normally to determine the depth of water . It involves transmitting acoustic waves into water and recording the time interval between emission and return of a pulse; the resulting time of flight , along with knowledge of the speed of sound in water, allows determining the distance ...

5. AN/SQS-26 - Wikipedia

   en.wikipedia.org/wiki/AN/SQS-26

   AN/SQS-26 was a United States Navy surface ship, bow mounted, low frequency, active/passive sonar developed by the Naval Underwater Sound Laboratory [1] and built by General Electric and the EDO Corporation. At one point, it was installed on 87 [2] US Navy warships from the 1960s to the 1990s and may still be in use on ships transferred to ...

6. Bistatic sonar - Wikipedia

   en.wikipedia.org/wiki/Bistatic_sonar

   Bistatic sonar can work in two ways: by utilizing either the target backscattering or forward scattering. Backscattering bistatic sonar is the sonar in which the bistatic angle φ is less than 90°. Forward scattering is the physical phenomena based on Babinet's principle. Forward scattering bistatic sonar is the sonar in which the bistatic ...

7. 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 ...