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The SOFAR channel (short for sound fixing and ranging channel), or deep sound channel (DSC), [1] is a horizontal layer of water in the ocean at which depth the speed of sound is at its minimum. The SOFAR channel acts as a waveguide for sound, and low frequency sound waves within the channel may travel thousands of miles before dissipating.
The submarine records a (coded) message on the buoy, launches the buoy while staying submerged, the buoy ascends to the surface of the water and stays inactive for the moment while the submerged submarine leaves the area. After a preset duration, e.g. one hour, the buoy starts to emit the message by radio waves.
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 ...
The CAPTAS-4 is a towed array sonar developed by Thales Underwater Systems to equip first-rank surface combatants.Manufactured in Brest, France, it represents the high-end and most powerful system of the company's CAPTAS (Combined Active and Passive Towed Array Sonar) line of products [1] and equips several first-rank warships of the French Navy as well as those of various export customers.
USHUS is an Integrated Submarine Sonar System [1] developed by the Naval Physical and Oceanographic Laboratory (NPOL) of the Defence Research and Development Organisation (DRDO) of India and manufactured by Bharat Electronics Limited (BEL). It has been developed for use in submarines of the Indian Navy, especially for Sindhughosh-class submarines.
The first detection of a Soviet nuclear submarine occurred on 6 July 1962 when NAVFAC Barbados recognized and reported contact #27103, a Soviet nuclear submarine west of Norway coming into the Atlantic through the Greenland-Iceland-United Kingdom (GIUK) gap. [1] [3] When USS Thresher sank in 1963, SOSUS helped determine its location.
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Submarine detection systems are an aspect of antisubmarine warfare. They are of particular importance in nuclear deterrence , as they directly undermine one of the three arms of the nuclear triad by making counter-force attacks on submarines possible.