Workshop on Underwater Positioning

The Hydrographic Society organised a workshop on underwater positioning and navigation on Wednesday 10th December 2008. On board of the tug René Siegfried, three presentations were held, touching various aspects of the matter.   Hans-Willem de Leeuw (sales engineer, IXSEA Benelux) explained the principle of the fibre optic gyroscope and introduced various applications of this technique in the IXSEA product range. Especially in the offshore, there is a demand for precise underwater navigation and the combination of the fibre-optic gyroscopes with GPS or DVL make the positioning more accurate, even after hours.   Neil MacDonald (technical manager, Applied Acoustics) went... (read more)
2008-12-12 10:30:25

Positioning Network Enhancements

Global precise positioning supplier Veripos has extended its multi-source Differential GPS service for Africa with the establishment of new reference station facilities at Dar es Salaam, Tanzania and Chimoio in Mozambique, in East Africa. Meanwhile, in West Africa, new reference facilities have also been sited on the island of Sao Tome in the Gulf of Guinea and Lambarene in Gabon. All the stations have been commissioned in response to increased development of regional oil and gas basins in addition to meeting corresponding growth in mineral exploration and production activities.Part of Veripos' worldwide high-precision GNSS positioning operations on behalf of leading... (read more)
2008-09-09 09:35:16

GeoTag Underwater Positioning Solution

Sercel (France) has launched GeoTag, an acoustic positioning solution for seabed seismic acquisition. GeoTag can be used to accurately position all types of ocean bottom cable (obc), ocean bottom node and transition zone cable systems for seabed seismic surveys in water depths down to 500 metres. The GeoTag solution operates with the smallest acoustic positioning transponder available on the market, according to the supplier. The transponders are attached to the seabed seismic equipment and interrogated by a vessel-based transceiver. GeoTag’s design allows for rapid maintenance such as battery replacement for improved crew efficiency. The transponders can also be stored on... (read more)
2015-10-19 10:28:15

Petrobras Positioning Contract for Veripos

Veripos has been awarded a three-year contract by the Survey Department of Petroléo Brasileiro S/A (Petrobras) for provision of high-accuracy GNSS positioning services in support of rig moves as well as operation aboard sixteen specialist support vessels engaged in pipelay, anchor-handling and flowline installation operations. Under the contract, Veripos will provide its high-precision Standard GPS augmentation service with a typical correction update rate of 15 seconds. Associated hardware supplies include LD3-D integrated mobile demodulators for use in conjunction with Petrobras-provided GPS receivers plus, UHF receivers for accessing both the Brazilian company's own reference network and Veripos Standard service signals.Supplementary facilities... (read more)
2010-05-27 09:14:23

Veripos Extends GNSS Positioning Networks

Veripos has extended the Baltic sector of its European multi-source Differential GPS service network with the establishment of new reference station facilities in Stockholm. Meanwhile, a new station has also been added to the Americas regional network serving offshore users in North, South and Central America as well as the Caribbean with installation of similar facilities in San Diego for enhanced coverage of eastern sectors of the Pacific. Commenting on the latest extensions, Veripos Technical Director Bobby Johnson said that they marked a further stage in the development of the Company's worldwide precision positioning capability as a result of increasing... (read more)
2010-07-26 11:22:29

Positioning First West African TLP

Fugro Survey BV is to undertake the crucial positioning work to install West Africa’s first Tension Leg Platform (TLP) on the Kizomba-A oilfield off Angola. The platform has to be positioned with an accuracy of less than a metre in water depths of 1180m. The contract was awarded to Fugro by Heerema Marine Contractors, which will install the TLP for the field operators. The TLP will be transported from Holland and installed at Kizomba using the float-over method to connect to pre-installed piles and tendons. When the TLP has been installed it will form part of the overall production scenario... (read more)
2003-11-11 12:00:00

Dredge Efficiency and Precise Positioning

Integrating Dredging and Hydrographic Techniques
Dredgers involved in mining for (precious) minerals and metals often work in an inland dredging pit. Dredgers float in a ‘wet environment’ where the surrounding water is used as transport medium. The fact that the minerals are mostly covered in various sediments is one of the biggest problems in mining them. This article describes some of the techniques used in these dredging operations and illustrates the importance of integrating techniques and information. Most minerals, like rutile and zirconia, are to be found on top of a layer of clay with the highest concentrations found closest to it. Pewter is mostly... (read more)
2008-01-01 01:00:00

Underwater Positioning Systems and Transponders

Kongsberg Maritime has launched during OTC a new range of acoustic underwater positioning systems and transponders, designed to harness the power of 'Cymbal' signal processing protocol whilst also being backwards compatible with the HPR 400 protocol and analog transponders. Other systems on display at OTC include HiPAP 501/451/351/351P, which are the second generation acoustic underwater positioning system offering improved position accuracy, longer range capability and faster data telemetry.  The new cNODE series of transponders consists of three models: Maxi - a full size transponder with large battery capacity, floating collar and release mechanism, and long life operation, designed primarily for... (read more)
2010-05-04 11:57:45

Small-form Subsea Positioning Transponders

Kongsberg Maritime is introducing a range of mini medium frequency subsea transponders. With a smaller form factor, improved operational functionality and design and the use of modern materials the cNODE MiniS family supersedes the KONGSBERG Mini SSBL transponders (MST) range, which was first available in 2002. Expanding the well-established cNODE portfolio, the cNODE MiniS 34-180 and cNODE MiniS 34-40V are the smallest transponders for use with HiPAP, cPAP and µPAP underwater positioning systems, and are ideal for accurate Remotely Operated Vehicle (ROV) positioning operations. Both new cNODE MiniS transponders are depth rated to 4,000m and offer a diverse range of... (read more)
2016-01-26 02:38:50

Underwater Positioning and Autonomous Monitoring

Sonardyne International, UK, will be attending its first Sea Tech Week exhibition in Brest, France, taking place from 8 to 12 October 2012 at the Congress Centre Le Quartz. Located on Stand 9, Sonardyne will be demonstrating Scout, a portable acoustic positioning system designed for tracking divers, ROV and towfish in waters of up to 1,000 metres deep. The system’s ease of use and high performance has earned Scout an enviable track record on a wide range of global projects. Sonardyne will also be showcasing its range of autonomous monitoring technologies and acoustic release transponders. Designed for low-cost, long endurance... (read more)
2012-10-02 03:12:17
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