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Sonar (sound navigation and ranging or sonic navigation and ranging) [2] is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances , communicate with or detect objects on or under the surface of the water, such as other vessels. [3]
First SOSUS stations. Sound Surveillance System (SOSUS) was the original name for a submarine detection system based on passive sonar developed by the United States Navy to track Soviet submarines. The system's true nature was classified with the name and acronym SOSUS classified as well.
A 16th-century Islamic painting depicting Alexander the Great being lowered in a glass submersible. The concept of underwater transport has roots deep in antiquity. There are images of men using hollow sticks to breathe underwater for hunting at the temples at Thebes, and the first known military use occurred during the siege of Syracuse (415–413 BC), where divers cleared obstructions ...
Toward the end of her service, the hull and sail of Nautilus vibrated sufficiently that sonar became ineffective at more than 4 kn (7.4 km/h; 4.6 mph) speed. [32] As noise generation is extremely undesirable in submarines, this made the vessel vulnerable to sonar detection. Lessons learned from this problem were applied to later nuclear submarines.
By using both systems in tandem, underwater masses could be detected and avoided, although this approach lacked the capability of the fathometer to echo-sound the depth of the ocean floor. [77] On March 13, Triton detected a submerged peak using active sonar and the gravity meter that confirmed the feasibility of this procedure. [77] [78]
A sweeping search and rescue effort involving Canadian Boeing P-8 Poseidon and C-130 Hercules reconnaissance aircraft and underwater sonar buoys has failed to find any sign of the vessel, US ...
The Submarine Signal Company was the first company engaged in underwater acoustics, becoming the national underwater sound experts and producing acoustical aids to navigation. It also became the major sonar supplier to the U.S. Navy in later years. [23]
A new cohort of explorers is turning to advanced underwater sonar imaging technology in hopes of a breakthrough. One of the first to pioneer the tech was marine explorer Bob Ballard, who ...