ROV Mid-water Station Keeping

An affordable and functional solution for Mid-water Station Keeping (MWSK) has been on the wish list of most ROV operators and manufacturers for some time now; the huge benefits in terms of operational efficiency and the future potential for pre-planned automated missions has made it a case of when, not if.      Against this backdrop and at the request of C-Innovation,CDL and Schilling Robotics engineers started work on a collaborative solutionover twelve months ago, the results of that effort were demonstrated in Marchin the Gulf of Mexico following an extensive period of Factory Acceptance Tests.   Traditional ROV station... (read more)
2011-04-05 02:41:22

Helping Make Blue Water Green

From December 2008 through October 2010, Arjen van Eijk and Florian Dirkse of the Netherlands will set sail on an adventure and produce a documentary targeted at raising awareness about the critical role oceans play in our world's climate. To ensure these two sailors will safely complete their "Care for the Ocean" mission, Hemisphere GPS and its partners Saderet and Nautikaris have donated navigation equipment.     With Hemisphere GPS' VS100 Compass aboard, Florian and Arjen will be able to precisely guide their 10m sailboat from the Galapagos Islands to the Suez Canal, while covering more than 47,000 kilometres of... (read more)
2009-02-26 10:47:14

Mapping Cold Water Coral Reef

In recent trials off Trondheim, Norway, the GeoSwath Plus swath bathymetry and side scan system was used for the first time on a remotely operated vehicle (ROV) to map cold water coral reefs. The objective of the survey was to test how effective the GeoSwath was as a ROV mounted sonar for identifying cold-water coral colonies. At 60m deep the Tautra ridge in Trondheim Fjord is home to world’s shallowest known cold-water coral reef, and was an ideal site for initial system trials. The corals seen there usually thrive in much deeper waters.  The GeoSwath was deployed on a Minerva... (read more)
2007-02-12 09:24:28

Shallow-water Survey in Canada

The St. Lawrence River channel operations
Canada is the second largest country in the world, with a shoreline measuring approximately 243,800km, more than six times the circumference of the Earth. The Canadian Hydrographic Service (CHS), established in 1883, is divided into four regions better to serve this immense territory. Shallow-water surveys take place in all four regions; however, one of these has the most intense operations: the St. Lawrence channel in the Québec Region. The Canadian Hydrographic Service based at Maurice Lamontagne Institute, in collaboration with the Canadian Coast Guard, is working to improve the efficiency and accuracy of these shallow-water survey operations. This paper presents... (read more)
2008-01-01 01:00:00

Deep-water Black-box Retrieval

A Game of Hunt-the-pinger Against the Clock
Restricted operating life, limited range and bearing ambiguity in deep water are the known limitations of current locator beacons mounted on aircraft. These problems raise important questions: what is the best method of locating existing pingers and what can replace them? In deep water, pinger detection equipment could be installed on a submarine. Alternatively, a transponder beacon can provide both range and bearing information, as well as demonstrate a significantly longer listening life. Although heavier and therefore not suitable for light aircraft, commercial aircraft could easily accommodate such beacons allowing easier retrieval of the aircraft black boxes. In the July/August... (read more)
2009-12-04 03:49:14

World Water Depth Drill Record

The new world water depth drilling record set by Transocean drillship Discoverer Deep Seas was accomplished using a Sonardyne dual redundant subsea acoustic positioning system. The record was set last November when the vessel spudded a well in 10,011 feet (3,051 metres) of water in the Gulf of Mexico. The Discoverer Deep Seas has been equipped with a dual Sonardyne Long and Ultra-Short BaseLine (LUSBL) system since December 2002 and uses it as a highly accurate position reference for its DP system. The system is particularly suited to deepwater applications as it combines the performance derived from Long BaseLine (LBL)... (read more)
2004-03-03 12:00:00

Satellite-based Water Quality Monitoring

EOMAP, Germany, has launched a high-resolution monitoring service for inland and coastal waters, with water quality information directly accessible online through the eoApp web application. Monitoring water quality for inland and coastal waters is a requirement for many government and private sector entities, which includes identifying long-term trends and understanding emerging problems over large areas that contain numerous water bodies – all to be done in near real time. The service is supported by data from a fleet of satellite sensors and uses proprietary physics-based processing technologies. The base product suite includes water quality parameters such as turbidity, chlorophyll concentrations... (read more)
2015-06-04 09:30:00

Precise RTK GPS Water Levels

Incline plane models in geoid-ellipsoid separation calibration
As more people adopt RTK GPS technology for measuring water levels, the issue of ellipsoid-geoid separation is increasingly being discussed. This article outlines various projects undertaken to calibrate this separation, and presents information to consider when using RTK GPS for measuring relative to an orthometric (geoid) datum. RTK GPS is increasingly being used for measuring water-level corrections during hydrographic survey, as for water levels in general. Measuring this third vertical dimension usually requires local site calibration to correct for separation between WGS84 ellipsoidal height and geoidal elevation, enabling conversion of WGS84 heights to orthometric heights such as mean seal level... (read more)
2008-01-01 01:00:00

Live On-water Ixsea Demonstration

Industry professionals could familiarise themselves with the latest technology available in the Ixsea underwater acoustic and navigation equipment range during Ocean Business 2011 in Southampton, UK.   Directly after departure, the Ixsea Echoes 5000 was launched, a range of wide-band chirp sub-bottom profilers capable of generating from very low frequencies and deep penetrations up to very high resolution frequencies. The system is based on more than ten years of sub-bottom experience. The Echoes sub-bottom profiler was mounted on the towed body, but could also be mounted on a pole if required.   During the survey Ixsea representatives also demonstrated the... (read more)
2011-04-07 10:15:50

Multibeam Echosounder for Medium to Deep Water

The RESON SeaBat 7160 multibeam echosounder has been developed for marine exploration, seafloor habitat mapping and hydrographic charting in medium to deep water (3 to 3,000m). Equipped with X-Range, it provides improved system immunity to external noise. The system can operate in water depths of between 3 to 3,000 metres, offering up to 512 high-density equidistant beams with a selection of coverage modes including features such as variable and steerable swath, together with real-time pitch and roll stabilisation maximising useable swath and performance. The SeaBat 7160 also provides the collection of high-density water-column data all wrapped up in a processing... (read more)
2013-01-18 10:17:57
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