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

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 Kevin Dixon, GNSS Product Manager, NavCom Technology Inc., USA

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

NPCC DGPS Positioning Contract

The National Petroleum Construction Company (NPCC) of Abu Dhabi, UAE has awarded C&C Technologies (Asia Pacific) Pte Ltd, a long-term contract for their C-Nav Globally Corrected GPS (GcGPS) positioning services. This is the fifth consecutive year that C & C Technologies, with its C-Nav positioning service, has been awarded this prestigious contract.   The contract also marked the beginning of a new partnership, as this will be the first collaborative effort with the recently appointed sub-distributor, Technical Equipment Service ME (TESME) in Abu Dhabi.   NPCC will utilise the wide range of positioning services provided by C-Nav to deliver high... (read more)
2008-03-05 10:46:10

Apex GNSS Positioning Service

Veripos has extended its range of services with the introduction of Apex, a new high-accuracy positioning solution. Complementing the company's existing Ultra service, Apex similarly uses precise point positioning (PPP) methods for correction and/or modelling of GNSS error sources. Each service operates independently, providing continuous decimetre-level accuracies. For delivery of the Apex service Veripos operates its own orbit and clock determination system (OCDS) which derives real-time corrections for all GPS constellation satellites using proprietary algorithms. Data is taken from the company's global network of more than 80 reference stations, with multiple and redundant OCDS systems running in parallel from two... (read more)
2010-04-06 11:04:46

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

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

OMEX Positioning Contract

Veripos has been awarded a five-year contract by Odyssey Marine Exploration (OMEX) of Tampa, USA, for supply of positioning services aboard its newly-renovated deep-ocean exploration vessel, MV Dorado Discovery. The 98m-long vessel, which is among the world's most advanced of its type, is due to begin an extensive series of mineral exploration and recovery surveys in the South Pacific, working offshore Papua New Guinea and Tonga. Under the contract, Veripos will provide MV Dorado Discovery with a combination of its global Ultra Precise Point Positioning (PPP) service for decimetre-level accuracies together with LD2-G2 integrated mobile receivers; associated software provisions include... (read more)
2010-09-30 11:17:55

Malaysian Positioning Contract

Veripos has been awarded a new three-year contract by Kuala Lumpur-based Orogenic Geoexpro for continued provision of GNSS positioning services to the Malaysian company’s fleet of vessels engaged on geophysical surveys, rig moves and major construction support projects throughout Southeast Asia. Services provided by Veripos under the contract include a combination of its dual-beam standard and ultra Precise Point Positioning (PPP) facilities supported by shipborne hardware comprising 30 LD3SG1 and 10 LD3G2 integrated mobile receivers. Also available is a series of proprietary software modules for real-time monitoring, control and QC operations. (read more)
2012-04-26 12:00:00
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