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

Positioning Contract for Veripos

Allseas, UK, has awarded Veripos (UK) a further three-year contract for continuing provision of specialist GNSS positioning services for its entire fleet of vessels headed by the world's largest pipelaying vessel, the 300m Solitaire. Other vessels concerned include companion DP pipelayers Audacia and Lorelay in addition to the DP trenching support and subsea installation vessel, Calamity Jane, the anchored pipelay barge, Tog Mor, and the ROSVs Highland Fortress, Highland Navigator and Highland Rover. Allseas expect to add to its fleet during the course of the contract what will be the world’s largest construction support vessel, the platform installation-decommissioning and pipelayer, Pieter Schelte, presently under construction at Daewoo Shipbuilding & Marine Engineering in... (read more)
2012-12-05 01:35:13

Geolab Positioning Contract

Veripos has been awarded a further three-year contract by Naples-based GeoLab Srl, one of Europe's leading turnkey offshore survey and construction support organisations, for provision of high-precision GNSS positioning services. The contract extends the relationship between the two companies following an earlier three-year agreement.   Under the new agreement, Veripos will continue to provide GeoLab with a full range of proprietary globalised satellite positioning facilities extending from its Standard GNSS augmentation service to its latest Ultra Precise Point Positioning (PPP) capability which ensures decimetre-level accuracies by minimising or removing all main GPS error sources.   Together with the supply of... (read more)
2008-05-07 08:44:42

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

Geolab Extends Positioning Contract

Veripos has been awarded a further two-year general services contract by Naples-based GeoLab Srl, a turnkey offshore survey and construction support organisation. The contract extends the relationship between the two companies following an earlier three-year agreement. Under the new agreement Veripos will continue to supply its full range of GNSS positioning solutions in support of GeoLab's fleet of dedicated multi-role survey vessels. These operate worldwide on behalf of major offshore construction and telecommunications companies from GeoLab headquarters in Naples, Italy and other operating bases in Abu Dhabi, Houston, and Pointe Noire in the Congo, West Africa. The solutions cover a... (read more)
2011-03-14 11:02:12

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

Veripos Wins Positioning Contract

UK-based companies NCS Survey and InterMoor have awarded Veripos a new three-year contract for provision of GNSS positioning services. The contract will be in support of their respective activities, particularly in and around the North Sea and Brazilian offshore sectors. Facilities to be supplied include a full range of proprietary satellite positioning capabilities, including the company’s latest Apex2 service utilising Precise Point Positioning (PPP) methods in conjunction with both GPS and Glonass constellations. A range of modular hardware comprising versatile integrated mobile units which can be configured to accommodate a wide range of positioning solutions will also be provided, together with... (read more)
2013-02-26 03:39:23

Community-sourced Positioning Project

The TeamSurv consortium offers sailors and powered boaters the opportunity to join a community that collects and shares depth information recorded by vessels' existing depth sounder equipment. Depth data, along with the vessel's position, are automatically logged and stored in real time, either by a software utility running on a Windows PC or using a dedicated hardware logging device. At the end of the voyage, the logged data is uploaded to the TeamSurv website. Submitted data are combined and processed, using unique algorithms, by TeamSurv and are corrected for actual or predicted water levels and other factors so as to... (read more)
2010-03-01 11:09:49

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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