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sound underwater communications

См. также в других словарях:

  • Underwater acoustics — The field of underwater acoustics is closely related to a number of other fields of acoustic study, including sonar, transduction, acoustic signal processing, acoustical oceanography, bioacoustics, and physical acoustics.HistoryUnderwater sound… …   Wikipedia

  • Alaska Communications System (ACS) — The Alaska Communications System (ACS), also known as the Washington Alaska Military Cable and Telegraph System (WAMCATS), was a system of cables and telegraph lines authorized by the U.S. Congress in 1900 and constructed by the U.S. Army Signal… …   Wikipedia

  • Diver communications — are the methods used by divers to communicate with each other or with surface members of the dive team. There are several distinct forms of diver communications: Voice communications Most professional diving equipment such as full face diving… …   Wikipedia

  • Battle of Drøbak Sound — Infobox Military Conflict conflict=Battle of Drøbak Sound caption= Blücher sinking in the Oslofjord. partof=the Norwegian Campaign of World War II date=9 April 1940 place=Drøbak Sound, Norway result=Decisive Norwegian victory combatant1=Norway… …   Wikipedia

  • Sonar — This article is about underwater sound propagation. For atmospheric sounding, see SODAR. For other uses, see Sonar (disambiguation) …   Wikipedia

  • Anti-frogman techniques — are security methods developed to protect watercraft, ports and installations, and other sensitive resources both in or nearby vulnerable waterways from potential threats or intrusions by frogmen or other divers.Risks and threats to be defended… …   Wikipedia

  • Battle of the Atlantic (1939–1945) — Infobox Military Conflict conflict = Battle of the Atlantic partof = World War II caption = Officers on the bridge of an escorting British destroyer keep a sharp look out for enemy submarines, October 1941 date = September 3 1939 May 7 1945 place …   Wikipedia

  • Communication with submarines — is difficult because radio waves do not travel well through thick electrical conductors like salt water. The obvious solution is to surface and raise an antenna above the water, then use ordinary radio transmissions. Early submarines had to… …   Wikipedia

  • Modulated ultrasound — Ultrasound can be modulated to carry an audio signal (like radio signals are modulated). This is often used to carry messages underwater, in underwater diving communicators, and short range (under five miles) communication with submarines; the… …   Wikipedia

  • Alfa class submarine — The Soviet Union/Russian Navy Project 705 ( Лира / Lyra ) was a submarine class of hunter/killer nuclear powered vessels (abbreviated PLA: Podvodnaya lodka atomnaya , nuclear hunter/killer submarine). The class is also known by the NATO reporting …   Wikipedia

  • Natural scientific research in Canada — This article outlines the history of natural scientific research in Canada, including mathematics, physics, astronomy, space science, geology, oceanography, chemistry, biology, medical research and psychology. The social sciences are not treated… …   Wikipedia

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