Satellite Positioning

Within the last twenty years Global Positioning System (GPS) receivers have revolutionised navigation. Integrated devices are capable of providing time, position, height, direction, heave and attitude to accuracies of a few nanoseconds time, 1cm position or 0.01 degree heading. All potentially displayed on a digital chart background with radar and auto-identification system overlays. In this first of two articles we look at current Satellite Positioning systems, how they work and how we can make them better. In a second article, to appear next month, we explore the future development of Satellite Positioning and the implications for navigation. How does Satellite... (read more)
2008-01-01 01:00:00

Underwater Positioning

Centimetric Accuracy Underwater-GPS
By Camille Béchaz, ACSA and Fran­­çois Boucquaert, Fugro-Topnav, France Fugro evaluated the accuracy of the GPS Intelligent Buoy (GIB-Lite) system for its possible use in shallow-water offshore underwater positioning applications. The trials proved that system accuracy could be brought up to centimetre level, the distance between two simultaneously tracked acoustic pingers having a standard deviation of 8cm. Additional works next to an offshore production platform are often required to increase oil recovery from an existing reservoir or to maintain its production rate over a longer period of time. The seabed near such a production platform typically shows pipelines, electric cables,... (read more)
2008-01-01 01:00:00

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

Indonesian Positioning Contract

Veripos has been awarded a two-year contract by hydrographic survey and subsea specialists PT Pageo Indonesia of Jakarta for provision of high-precision Differential GPS positioning services in support of major site survey and rig-positioning operations being carried out in the Mahakam Delta, Kalimantan on behalf of Total E&P Indonesie, a subsidiary of the Total Group of companies.   The services, which include supply of Veripos' latest LD3 integrated mobile GPS receiver and demodulators for calculating positions and output of data, are being used in support of jackup, semi-submersible and swamp drilling barge operations as well as shallow water survey vessels... (read more)
2008-02-04 03:25:53

Subsea Positioning Transponders Order

Unique Systems (USA) has taken delivery of a major consignment of Compatt 5 subsea positioning transponders from Sonardyne. The order complements Unique's existing worldwide inventory of Sonardyne acoustic equipment which includes RovNav 5 Long BaseLine transceivers and Ranger Ultra-Short BaseLine systems.     Unique Systems is part of the Unique Group based in Sharjah (UAE), which is a major distributor and rental company for advanced marine and diving equipment. The Compatt 5 equipment will be made available to rent from their additional US office in Houston which opened a year ago to support clients and offshore projects throughout the Gulf... (read more)
2009-07-03 11:21:09

Pipe-lay Positioning Support

Offshore survey company UTEC has consolidated its presence in the Middle East completing a significant contract for a major international pipelay contractor. The UAE (Dubai) project involved UTEC supporting the DP pipelay vessel in extremely shallow water providing enhanced USBL methodologies. The company also provided survey support services on two additional DP vessels which provided diver support and remedial services to the pipelay vessel. This is the second year in succession that UTEC has provided support to the contractor in the region. UTEC's Global Sales and Marketing director Trevor Hughes commented: “Based on our prior year’s performance the contractor as... (read more)
2013-01-31 10:19:36

Further Petrobras Positioning Contract

Veripos, UK, has been awarded a long-term contract by Petrobras, Brazil, for provision of positioning services in support of the Brazilian state-owned company’s BGL-1 pipeline installation barge operations.     Under the two-year contract, which includes an option for a further two years, Veripos will provide the 122-metre dynamically-positioned barge with continuous choice of its all-purpose Standard, Ultra and Differential Glonass positioning services supported by LD2-G2 mobile receiver equipment and Verify QC software for real-time position and quality control information.   The contract is the second to have recently been awarded to Veripos by Petrobras following an agreement last year... (read more)
2011-04-28 11:51:06

Survey and Positioning Contract

Aberdeen-based DOF Subsea UK has been awarded a contract worth around GBP2 million by Technip to provide survey and positioning services in BP-operated Block 31, offshore Angola. DOF Subsea will be supplying the services onboard the Skandi Bergen (supplied by DOF Subsea under a separate contract) and on board Technip's lay vessel the Deep Blue. It is anticipated that the project will commence in Quarter 3 2010 and will last for approximately 119 days. DOF Subsea provides subsea construction and engineering, IRM, ROV and survey support services to the world's major subsea markets. The company employs over 1,200 highly qualified... (read more)
2010-02-17 04:44:56

Dynamic Positioning Conference Programme

The Dynamic Positioning Committee of the Marine Technology Society has issued an Advance Programme for the 2010 Dynamic Positioning Conference. The Annual Conference will be held at the Westchase Hilton, Houston 12th and 13th October 2010. The Conference traditionally places a strong emphasis on new technology and this year is no exception with sessions on DP in The Arctic and New Applications, as well as a full session on Quality Assurance. As in the past, there will also be sessions on Design, Sensors, Thrusters and Operations. Expanded exhibit space will allow a larger number of vendors to display their products... (read more)
2011-02-24 09:10:54
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