LBL Underwater Positioning

Long baseline (LBL) positioning has many applications both commercially and in research, from surveying a ship hull to positioning offshore platforms in deeper waters. The technique consistently provides accuracies in the order of decimetres over large areas, independent of depth. Recent advances include the integration with other acoustic techniques or with inertial navigation systems for greater levels of accuracy. Since navigation by GPS isbased on electromagnetic signals that cannot penetrate water, subsea positioning requires a different approach. As sounds waves travel through the sea they alternately compress and decompress the water molecules; these compressions/decompressions are detected as changes in pressure.... (read more)
2008-01-19 12:00:00

LBL Array for Hostile Topography

Using GIS to Find Transponder Sites Along Pipeline Routes
The unique seabed topography of oil & gas field 'Ormen Lange', in the North Sea near Norway makes it very difficult to design pipeline routes and associated structures in compliance with the strain and fatigue criteria governed by physical properties of construction materials, installation method and their interaction with the seabed. Despite substantial pre-lay intervention the pipelay corridor remained very narrow and positioning accuracies were required beyond the capabilities of vessel-borne (aided) sub-surface positioning systems. The installation tolerance described above, in combination with rugged terrain, presents a special challenge to the planning of sites for any acoustic positioning transponder which... (read more)
2008-01-01 01:00:00

Unmanned Surface Vehicle as Aid for LBL Positioning

The unmanned surface vehicle (USV) market is expanding, with more and more remotely controlled and autonomous USVs becoming available as commercial products. While environmental monitoring and data collection remain the primary target for lightweight USVs, EvoLogics recently tried out a rather atypical but very promising approach for using its Sonobot. The vehicle turned out to be well suited for calibration and testing of long-baseline (LBL) positioning systems, opening up a wide range of new applications. Maria Pleskach, EvoLogics GmbH, Germany A typical LBL underwater acoustic positioning system uses an array of at least three seafloor-mounted transponders that form the system’s... (read more)
2015-08-18 09:07:00

Total Deploys LBL Network in Record-breaking Time

Following on from the installation of a Long BaseLine (LBL) acoustic positioning network at the giant Egina oil field off the coast of Nigeria, French oil major Total and its project partners have repeated their success using the same Sonardyne Fusion 6G technology offshore Angola at the larger and deeper Kaombo oil field. The campaign to deploy, calibrate and make ready for work the field-wide array of transponder frames was completed in 31 days using the seabed component of a Fusion 6G system. This was half the time budgeted for, a figure that is thought to have set a new... (read more)
2015-10-06 09:53:08

Unmanned Surface Vehicle as Aid for LBL Positioning

EvoLogics Explores New Applications for its Sonobot USV
The market of unmanned surface vehicles (USVs) is expanding, with more and more remotely controlled and autonomous USVs becoming available as commercial products. While environmental monitoring and data collection remain the primary target for lightweight USVs, EvoLogics recently tried out a rather untypical, but very promising approach for using its Sonobot: the vehicle turned out to be well suited for calibration and testing of long-baseline (LBL) positioning systems, opening a wide range of new applications. A typical LBL underwater acoustic positioning system uses an array of at least three seafloor-mounted transponders that form the system’s baseline. Before putting the system... (read more)
2015-08-06 03:22:26

INSTALL SRL at Sonardyne Training Center

Staff from INSTALL SRL from Italy have completed the Sonardyne Fusion 6G LBL and Metrology course that took place at Sonardyne Training Centre in Plymouth, UK. INSTALL was represented by managing, data processing and survey engineering personnel in order that they would all gain the same knowledge and be able to use the LBL methodology to plan and conduct LBL acoustic positioning activities. Part of the course was focused on subsea metrology technics applied to LBL acoustics positioning. Sonardyne Fusion 6G is a widely used, popular LBL acoustic positioning system, providing the most accurate method for installing subsea structures, tracking... (read more)
2014-09-22 01:48:34

USV as Mobile Testbed for Developers

At MTS/IEEE OCEANS’15 in Genoa, EvoLogics presented its latest developments with a mobile demonstration kit that combines underwater LBL positioning with the company’s unmanned surface vehicle, the Sonobot. The company’s experts showcased the capabilities of EvoLogics LBL (Long Baseline) positioning and communication system and successfully rose to the challenge of quickly and cost-efficiently deploying and setting up the equipment, common for live demos at industry events.   The new solution was to simplify logistics and have the team and spectators stay on-shore, instead incorporating the Sonobot USV into the demonstration setup as a mobile node for LBL calibration and a... (read more)
2015-06-01 09:02:00

ROV Support Vessel Upgrades to Sonardyne 6G to Meet Brazil’s New Contracting Specifications

Sixth-generation (6G) underwater positioning technology from Sonardyne has been chosen by vessel owner and operator Companhia Brasileira de Offshore (CBO) to meet Brazil’s stringent new contracting specifications for subsea positioning. The multi-functional Compatt 6 transponders and Ranger 2 Ultra-Short BaseLine (USBL) HPT transceivers that make up the order will be utilised alongside existing Sonardyne technology on board the ROV support vessel 'CBO Isabella'. This will support of a wide variety of subsea operations, including structure installation, pipeline metrology and ROV tracking. On long-term contract to Petrobras since 2010, the CBO Isabella opted to have available two independent acoustic positioning systems... (read more)
2018-08-09 02:02:12

Challenging 6G Demo

Sonardyne's 6G (Sixth Generation) acoustic positioning technology was demonstrated to industry professionals during in-water demonstrations in Stonehaven Harbour on the east coast of Scotland. For three days last week, a Long BaseLine (LBL) positioning network of six Compatt 6 transponders was set up against the walls of the harbour, in depths of as little as two metres. A Dunker 6 LBL and telemetry transceiver was then used to perform an array calibration and collect acoustic range data.     Chief surveyors, project managers and equipment rental specialists were able to get hands-on with 6G by controlling the system from a... (read more)
2011-10-13 12:00:00

Subsea Array Planning

Beyond Traditional Long Baseline Transducers
The development of deepwater and ultra-deepwater subsea fields is one of the greatest challenges facing the offshore oil and gas industry today. The depths involved present a host of engineering challenges during both the development phase and the life of field maintenance programmes. A critical component of the development and maintenance of subsea oil and gas fields common to virtually all operations is accurate subsea positioning. This article focuses on the latest technology used in deepwater positioning and on the development of new planning software and techniques to support the advances made in positioning systems. Subsea Positioning Subsea positioning is... (read more)
2010-02-11 04:26:48
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