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Sonar Decoy
A sonar decoy is a device for decoying sonar. One may be released from a submarine or a surface vessel. A decoy acts as false targets for human operators and/or sonar-homing weapons such as acoustic torpedoes. Many count as a type of torpedo defence. Submarine decoys The first submarine decoys were the German Bold (decoy), Bold fitted to U-boats of World War II. These were a pellet of calcium hydride in a simple metal container. On contact with sea water, the calcium hydride decomposed to produce a trail of hydrogen gas bubbles that acted as a bubble curtain and reflected ASDIC impulses to produce a false target. The container trapped hydrogen and floated, with a crude spring valve to maintain buoyancy to keep it at a constant depth. Later decoys, such as Sieglinde (decoy), Sieglinde, were motorised and could deploy their false target away from the host submarine, increasing safety. Surface ship decoys Decoys were also used by surface ships to decoy the developing acoustic to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pillenwerfer
(also called , a term derived from ''kobold'') was a German sonar decoy, used by U-boats during the Second World War from 1942 onwards. It consisted of a metal canister about in diameter filled with calcium hydride. It was launched by an ejector system colloquially referred to as (English: " pill thrower"). When mixed with seawater, the calcium hydride produced large quantities of hydrogen, which bubbled out of the container, creating a false sonar target. A valve opened and closed, holding the device at a depth of about . The device lasted 20 to 25 minutes. It replicated the echo of an Asdic-sonar submarine contact. The Royal Navy The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ... called it SBT (Submarine Bubble Target). See also * References External links Sonar dec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sieglinde (decoy)
was a sonar decoy used during the Second World War by German U-boats. was installed in chambers on the sides of the U-boat. It could be ejected to a considerable distance from the boat when attempting to hide from a seeker's sonar Sonar (sound navigation and ranging or sonic navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances ( ranging), communicate with or detect objects o ... equipment. The was powered by electric motors, allowing it to move at and to periodically ascend or dive, thus imitating the sonar return of an actual submarine. This allowed the real U-boat to slip away quietly from pursuing ships. It was typically used in combination with (or ) decoys. References Sonar decoys Weapons countermeasures U-boats {{submarine-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DCL Technology Demonstrator Programme
The US DCL (Detection Classification and Localisation) demonstrator program is aimed at proving that an active torpedo detection system is able to resolve a salvo of torpedoes with sufficient time and accuracy that an anti-torpedo torpedo may be fired back to hit and destroy the threat. Overview The DCL systems consist of an active source emitter which sends high-frequency pings into the water. Reflections from in-water objects are received by a towed array tuned to those frequencies. By processing the reflections it is possible to determine whether objects are torpedoes, or non-threat objects. The system is also combined with a passive acoustic towed array specifically designed for torpedo detection. The passive acoustic array is able to analyse the structured sound emanating from a torpedo and thereby classify the weapon type and mode of operation. Two teams were building alternative DCL demonstration systems, the first to test was Ultra Electronics Ultra Electronics Holdin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SSTD
The United Kingdom Surface Ship Torpedo Defence (SSTD) system entered into service with the Royal Navy in 2004. The system is produced by Ultra ElectronicsSSTD Datasheet at the Ultra Electronics website and is known as S2170 or Sonar 2170 by the and as Sea Sentor in the export market. The system consists of * an acoustic passive towed array * a towed acoustic countermeasure (flexible) * a single-drum winch * a processing cabinet * 2 display consoles * 2 expendable acoustic device launchers (1 port, 1 starboard) * 16 expendable acoustic devices (8 in each launcher) The system is a footprint compatible replacement for the [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Akula-class Submarine
The ''Akula'' class, Soviet designation Project 971 ''Shchuka-B'' (, NATO reporting name ''Akula'') is a series of fourth generation nuclear-powered attack submarines (SSNs) first deployed by the Soviet Navy in 1986. There are four sub-classes or flights of Shchuka-B, consisting of the original seven Project 971 boats (codenamed ''Akula I''), commissioned between 1984 and 1990; six Project 971Is (Improved ''Akula''s), commissioned between 1991 and 2009; one Project 971U (''Akula II''), commissioned in 1995; and one Project 971M (''Akula III''), commissioned in 2001. The Russians call all of the submarines ''Shchuka-B'', regardless of modifications. Some confusion may exist as the name ''Akula'' (Russian: Акула, meaning 'shark' in Russian) was used by the Soviets for a different class of submarines, the Project 941, which is known in the West as the . The Project 971 was named ''Shchuka-B'' by the Soviets but given the designation ''Akula'' by the West after the name of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Delta-class Submarine
The Delta class, (Russian language, Russian: Дельта) List of ships of Russia by project number, Soviet designations Project 667B ''Murena'', Project 667BD ''Murena-M'', Project 667BDR ''Kalmar'', Project 667BDRM ''Delfin'', (List of NATO reporting names for submarines, NATO reporting names Delta I, Delta II, Delta III, Delta IV respectively) are a family of Nuclear submarine, nuclear-powered ballistic missile submarines, designed and built in the Soviet Union, which formed the backbone of the Soviet and Russian strategic submarine fleet since their introduction in 1973. They carry nuclear ballistic missiles of the R-29 Vysota family, with the Delta I, Delta II, Delta III and Delta IV classes carrying the R-29/R-29 Vysota, SS-N-8 'Sawfly', R-29D/SS-N-8 'Sawfly', R-29R/R-29 Vysota, SS-N-18 'Stingray' and R-29RM Shtil, R-29RM/SS-N-23 'Skiff' (and later on R-29RMU Sineva, improved R-29RMU2 Layner, versions) respectively. The Soviets viewed the Deltas as an iterative improveme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maareech ATDS
Maareech Advanced Torpedo Decoy System (ATDS) is a torpedo detection and countermeasure system used by the Indian Navy. The system offers a complete solution to detect and locate an incoming torpedo and to apply countermeasures to protect naval platform against torpedo attack. It was developed as a joint project of the Naval Physical and Oceanographic Laboratory (NPOL), Kochi and the Naval Science and Technological Laboratory (NSTL), Visakhapatnam. Description It is an anti-torpedo system with towed and expendable decoys. The system is capable of detecting, confusing, diverting and decoying the incoming torpedoes. The decoy helps in exhausting the energy of the torpedo by running the latter through long and ineffective course and prevents them from homing in to the targeted platform with its advanced countermeasures capabilities. Mareech systems is being deployed on all current and future frontline warships of Indian Navy ships. The underwater arrays for Maareech are being ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mobile Submarine Simulator
The mobile submarine simulator (MOSS) MK70 is a sonar decoy used by submarines of the United States Navy. It was a 10-inch vehicle, without an explosive warhead, but able to generate both an active sonar echo and a passive sound signature recorded to be extremely similar to that of the launching submarine. The purpose of MOSS was to create multiple targets all with the same acoustic signature. MOSS was originally developed by Gould until Westinghouse acquired that division. Some current underwater training targets are modeled after MOSS's design. The MOSS first entered service in 1976 and was deployed on all American ballistic missile submarines A ballistic missile submarine is a submarine capable of deploying submarine-launched ballistic missiles (SLBMs) with nuclear warheads. These submarines became a major weapon system in the Cold War because of their deterrence theory, nuclear ... from the 1980s until it was withdrawn in the mid 1990s. See also * ADM-160 MALD ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AN/SLQ-25 Nixie
The AN/SLQ-25 Nixie and its variants are towed torpedo decoys used on US and allied warships. It consists of a towed decoy device (TB-14A) and a shipboard signal generator. The Nixie is capable of defeating wake-homing, acoustic-homing, and wire-guided torpedoes. The decoy emits signals to draw a torpedo away from its intended target. The Nixie attempts to defeat a torpedo's passive sonar by emitting simulated ship noise—such as propeller and engine noise—or defeat a torpedo's active sonar by amplifying and returning its pings. Typically, larger ships may have two Nixie systems mounted at the stern of the ship to allow operation singularly or in pairs while smaller ships may have only one system. In accordance with the Joint Electronics Type Designation System (JETDS), the "''AN/SLQ-25''" designation represents the 25th design of an Army-Navy electronic device for waterborne countermeasures special equipment. The JETDS system also now is used to name all Department of D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fanfare (decoy)
The T-Mk 6 Fanfare is a towed sonar decoy developed after the Second World War by the United States Navy. It replaced the Foxer noisemaker. It was more effective than the Foxer, producing a sound similar to a ship's propeller, rather than wideband noise. File:USS Cassin Young-IMG 5402.jpg, Winches and decoys on board File:USS Cassin Young-IMG 5403.jpg, A towed decoy on board USS ''Cassin Young'' External links * https://web.archive.org/web/20060222070937/http://www.de220.com/Armament/Decoys/Decoys.htm * https://web.archive.org/web/20060213013431/http://www.de220.com/Mysteries/Mysteries.htm Sonar decoys Weapons countermeasures {{weapon-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Foxer
Foxer was the code name for a United Kingdom, British-built Sonar decoy, acoustic decoy used to confuse Nazi Germany, German acoustic homing torpedoes like the G7es torpedo, G7 torpedo during the Second World War. A US version codenamed FXR was deployed at the end of September 1943 on all transatlantic escort vessels. A Canadian version was also built called the CAAT (Canadian Anti-Acoustic Torpedo) device. It was later replaced in US service by the Fanfare (decoy), Fanfare noisemaker. The device consisted of one or two noise-making devices towed several hundred metres astern of the ship. The noise makers mechanically generated a far louder cavitation noise than the ship's propellers. This noise decoyed the acoustic torpedoes away from the rear of the ship into a circling pattern around the noise maker (which was too small to strike) until the torpedo ran out of fuel. The noisy ''Foxer'' had the disadvantage that it also prevented the ship's own Sonar#ASDIC, ASDIC from detecting a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ASDIC
Sonar (sound navigation and ranging or sonic navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances ( ranging), communicate with or detect objects on or under the surface of the water, such as other vessels. "Sonar" can refer to one of two types of technology: ''passive'' sonar means listening for the sound made by vessels; ''active'' sonar means emitting pulses of sounds and listening for echoes. Sonar may be used as a means of acoustic location and of measurement of the echo characteristics of "targets" in the water. Acoustic location in air was used before the introduction of radar. Sonar may also be used for robot navigation, and sodar (an upward-looking in-air sonar) is used for atmospheric investigations. The term ''sonar'' is also used for the equipment used to generate and receive the sound. The acoustic frequencies used in sonar systems vary from very low ( infrasonic) to e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
