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

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

Deepsea Positioning Accuracy

First NEMO Tower for Astrophysical Research
The Italian Istituto Nazionale di Fisica Nucleare (INFN) is developing a large underwater apparatus to investigate new frontiers in astrophysical research. The NEutrino Mediterranean Observatory, NEMO, consists of a 3D-array of optical sensors capable of detecting the primary source of extremely high-energy neutrinos. This article covers underwater positioning techniques: system architecture, technical, advanced and data processing aspects, and preliminary data analysis. The first prototype, NEMO Phase 1, was deployed in December 2006 off the coast of Catania. A set of synchronous acoustic beacons was installed in the sea at a depth of 2,000m to position a large number of optical... (read more)
2007-05-31 12:00:00

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

Guidelines for GNSS ­Positioning

A joint OGP & IMCA Revision of the 1994 UKOOA Guidelines
The original UKOOA Guidelines for the use of differential GPS in offshore surveying, published in 1994, were widely used within the offshore survey industry. In 2005, the International Oil & Gas Producers Association (OGP) took over the custodianship of the guidelines from Oil & Gas UK (formerly UKOOA). At that time it was recognised that the original guidelines needed updating in order to reflect the rapid technical advances in satellite navigation technology of recent years and to maintain the purpose and relevance of the original guidelines. OGP and the International Marine Contractors Association (IMCA) agreed to work together on the... (read more)
2013-01-18 02:14:13

Survey and Positioning Contract

DOF Subsea UK has entered into a long term agreement with Heerema Marine Contractors Nederland BV (HMC) to provide survey and positioning services onboard its deepwater construction vessels. The agreement covers a worldwide scope, but the current focus is on projects which are already underway in the Gulf of Mexico and West Africa. Commenting on the contract award, Garry Millard, DOF Subsea UK’s Managing Director said, “We’re delighted to be awarded with this agreement. It confirms the trust and commitment that has developed between both companies over the last five years and gives us the opportunity to further demonstrate our... (read more)
2008-10-29 12:04:42

High Precision Positioning

Extension of the Condamine Port in Monaco
The port of Monaco is undergoing an extensive construction process that will help double the port's capacity and protect it from heavy eastern swells and dangerous Mediterranean storms. The new port will include two unusual pontoon-type breakwaters as well as an additional hectare of land reclaimed from the sea. The project, costing more than 243 million euro, was initiated in June 1999 and is today slightly ahead of schedule. The existing port was built at the beginning of the century. At that time the water was too deep to allow, using building techniques of the day, construction of a jetty... (read more)
2008-01-01 01:00:00
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