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Short Baseline Acoustic Positioning System
A short baseline (SBL) acoustic positioning system is one of three broad classes of underwater acoustic positioning systems that are used to track underwater vehicles and divers. The other two classes are ultra short baseline systems (USBL) and long baseline systems (LBL). Like USBL systems, SBL systems do not require any seafloor mounted transponders or equipment and are thus suitable for tracking underwater targets from boats or ships that are either anchored or under way. However, unlike USBL systems, which offer a fixed accuracy, SBL positioning accuracy improves with transducer spacing. Thus, where space permits, such as when operating from larger vessels or a dock, the SBL system can achieve a precision and position robustness that is similar to that of sea floor mounted LBL systems, making the system suitable for high-accuracy survey work. When operating from a smaller vessel where transducer spacing is limited (i.e. when the baseline is short), the SBL system will exhib ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SBL Acoustic Positioning System PILOT
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SBL may refer to: * Society of Biblical Literature * Spamhaus Block List of spamming IP addresses * Stadium Builder License (personal seat license), to buy season tickets * Super Bowl L, officially known as Super Bowl 50 * Supreme Beings of Leisure, an electronic/lounge band Sports leagues * Slovak Basketball League * Southland Bowling League, US women's college conference * State Basketball League, former name of the west conference of NBL1 in Western Australia * Super Basketball League, Taiwan * Swiss Basketball League The Swiss Basketball League, also known as SB League or SBL, is the top-tier professional club basketball league in Switzerland. It is organized by Swiss Basketball. The winners of the SBL are crowned Swiss national basketball champions. Current ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Underwater Acoustic Positioning System
An underwater acoustic positioning system is a system for the tracking and navigation of underwater vehicles or divers by means of acoustic distance and/or direction measurements, and subsequent position triangulation. Underwater acoustic positioning systems are commonly used in a wide variety of underwater work, including oil and gas exploration, ocean sciences, salvage operations, marine archaeology, law enforcement and military activities. Method of operation Figure 1 describes the general method of operation of an acoustic positioning system, this is an example of a long baseline (LBL) positioning system for ROV ;Baseline station deployment and survey Acoustic positioning systems measure positions relative to a framework of baseline stations, which must be deployed prior to operations. In the case of a long-baseline (LBL) system, a set of three or more baseline transponders are deployed on the sea floor. The location of the baseline transponders either relative to each ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ultra-short Baseline
USBL (ultra-short baseline, also known as SSBL for super short base line) is a method of underwater acoustic positioning. A USBL system consists of a transceiver, which is mounted on a pole under a ship, and a transponder or responder on the seafloor, on a towfish, or on an ROV. A computer, or "topside unit", is used to calculate a position from the ranges and bearings measured by the transceiver. Mechanism An acoustic pulse is transmitted by the transceiver and detected by the subsea transponder, which replies with its own acoustic pulse. This return pulse is detected by the shipboard transceiver. The time from the transmission of the initial acoustic pulse until the reply is detected is measured by the USBL system and is converted into a range. To calculate a subsea position, the USBL calculates both a range and an angle from the transceiver to the subsea beacon. Angles are measured by the transceiver, which contains an array of transducers. The transceiver head normally co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Long Baseline Acoustic Positioning System
A long baseline (LBL) acoustic positioning system is one of three broad classes of underwater acoustic positioning systems that are used to track underwater vehicles and divers. The other two classes are ultra short baseline systems (USBL) and short baseline systems (SBL). LBL systems are unique in that they use networks of sea-floor mounted baseline transponders as reference points for navigation. These are generally deployed around the perimeter of a work site. The LBL technique results in very high positioning accuracy and position stability that is independent of water depth. It is generally better than 1-meter and can reach a few centimeters accuracy. LBL systems are generally employed for precision underwater survey work where the accuracy or position stability of ship-based (SBL, USBL) positioning systems does not suffice. Operation and performance Long baseline systems determine the position of a vehicle or diver by acoustically measuring the distance from a vehicl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USNS Mizar (T-AGOR-11)
USNS ''Mizar'' (MA-48/T-AGOR-11/T-AK-272) was a vessel of the United States Navy. She was named after the star Mizar. Cargo ship ''Mizar'' was built as a small ice-strengthened, double hull, cargo ship of the ''Eltanin'' class on a Maritime Administration type (C1-ME2-13a) hull, by Avondale Marine Ways, Inc. from January 1957. She entered service on March 7, 1958, and served as part of the Military Sea Transportation Service (MSTS), working around Canada and Greenland, with a single voyage to Antarctica in 1961. Naval Research Laboratory The loss of the on April 10, 1963, and problems handling heavy search equipment over the side from in 1963 drove the Naval Research Laboratory (NRL) requirement for a larger, more capable ship than the usual oceanographic research type. A search for a candidate ship, capable of being modified for an inboard center well, led to selection of ''Mizar'' in late 1963. In 1964 ''Mizar's'' successful search for the sunken submarine, before modific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bathyscaphe Trieste
''Trieste'' is a Swiss-designed, Italian-built deep-diving research bathyscaphe which reached a record depth of about in the Challenger Deep of the Mariana Trench near Guam in the Pacific. On 23 January 1960, Jacques Piccard (son of the boat's designer Auguste Piccard) and US Navy Lieutenant Don Walsh achieved the goal of Project Nekton. It was the first crewed vessel to reach the bottom of the Challenger Deep. Design ''Trieste'' consisted of a float chamber filled with gasoline (petrol) for buoyancy, with a separate pressure sphere to hold the crew. This configuration (dubbed a "bathyscaphe" by the Piccards) allowed for a free dive, rather than the previous bathysphere designs in which a sphere was lowered to depth and raised again to the surface by a cable attached to a ship. ''Trieste'' was designed by the Swiss scientist Auguste Piccard and originally built in Italy. His pressure sphere, composed of two sections, was built by Acciaierie Terni. The upper part was manufactu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS Thresher (SSN-593)
USS ''Thresher'' (SSN-593) was the lead boat of her class of nuclear-powered attack submarines in the United States Navy. She was the U.S. Navy's second submarine to be named after the thresher shark. On 10 April 1963, ''Thresher'' sank during deep-diving tests about east of Cape Cod, Massachusetts, killing all 129 crew and shipyard personnel aboard. It is the second-deadliest submarine incident on record, after the 1942 loss of the French submarine ''Surcouf'', in which 130 crew died. Her loss was a watershed for the U.S. Navy, leading to the implementation of a rigorous submarine safety program known as SUBSAFE. The first nuclear submarine lost at sea, ''Thresher'' was also the third of four submarines lost with more than 100 people aboard, the others being ''Argonaut'', lost with 102 aboard in 1943, '' Surcouf'' sinking with 130 personnel in 1942, and ''Kursk'', which sank with 118 aboard in 2000. Significance of design and loss Created to find and destroy Soviet su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Depressor Weight
A depressor weight is a device used on tow lines in nautical applications. A depressor weight can be attached to a floating or otherwise stiff line to effectively produce a catenary geometry better able to mitigate shocks associated with towing and wave In physics, mathematics, and related fields, a wave is a propagating dynamic disturbance (change from equilibrium) of one or more quantities. Waves can be periodic, in which case those quantities oscillate repeatedly about an equilibrium (res ... impacts. References {{reflist Nautical terminology ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moss Landing Marine Laboratories
The Moss Landing Marine Laboratories (MLML) is a multi-campus marine research consortium of the California State University System, headquartered at Moss Landing, California. Organization Moss Landing Marine Laboratories is part of the California State University, administered by San Jose State University (SJSU), and located in Moss Landing, California. The main building is located at 8272 Moss Landing Road, . It was established in 1966. At the midpoint of the coast of Monterey Bay, it is only a few hundred meters from Monterey Canyon, the largest undersea canyon on the west coast of the Americas. As a result, researchers are able to reach areas with depths greater than 1000 meters in less than an hour by boat from the facility. The facility is a sea grant college, which offers a Master's of Science degree in marine sciences through the seven universities that make up the consortium, as well as offering graduate and undergraduate marine science courses to the students of the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Remotely Operated Underwater Vehicle
A remotely operated underwater vehicle (technically ROUV or just ROV) is a tethered underwater mobile device, commonly called ''underwater robot''. Definition This meaning is different from remote control vehicles operating on land or in the air. ROVs are unoccupied, usually highly maneuverable, and operated by a crew either aboard a vessel/floating platform or on proximate land. They are common in deepwater industries such as offshore hydrocarbon extraction. They are linked to a host ship by a neutrally buoyant tether or, often when working in rough conditions or in deeper water, a load-carrying umbilical cable is used along with a tether management system (TMS). The TMS is either a garage-like device which contains the ROV during lowering through the splash zone or, on larger work-class ROVs, a separate assembly which sits on top of the ROV. The purpose of the TMS is to lengthen and shorten the tether so the effect of cable drag where there are underwater currents is minimize ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heald Island
Heald Island () is an island, long and high, which projects through the ice of Koettlitz Glacier just east of Walcott Bay, in Victoria Land, Antarctica. It was discovered and named by the British National Antarctic Expedition The ''Discovery'' Expedition of 1901–1904, known officially as the British National Antarctic Expedition, was the first official British exploration of the Antarctic regions since the voyage of James Clark Ross sixty years earlier (1839–18 ... (1901–04) for Seaman William L. Heald, a member of the expedition who saved the life of Hartley T. Ferrar when the latter was suffering from scurvy in 1902. See also * List of antarctic and sub-antarctic islands References Islands of Victoria Land Scott Coast {{ScottCoast-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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