Kongsberg Seatex Motion Reference Products

At Oceanology International 2012, two Motion Reference Units from Kongsberg Maritime’s position reference specialist division, Kongsberg Seatex, Norway, have been showcased. The MRU 3 is a completely new model within Kongsberg Seatex’s 5th generation of roll, pitch and heave motion sensors. It is especially designed for heave compensation applications including real-time heave compensation of echo sounders and active heave compensation of offshore cranes. It provides heave measurements to meet IHO standards and achieves high reliability by using solid state sensors with no rotational or mechanical parts. Another new model to the fifth generation of MRUs, the new MRU E, is... (read more)
2012-04-16 10:37:23

Inertial Labs to Supply STR with Motion Reference Systems

Subsea Technology & Rentals Ltd (STR, UK) has entered into a partnership agreement with USA-based Inertial Labs to distribute its innovative motion reference systems. Inertial Labs’ Motion Reference Unit (MRU-B2), along with its Enhanced Motion Reference Unit (MRU-E) and professional model (MRU-P) will be joining STR’s expanding rental pool. The Motion Reference Unit (MRU-B2), is an inertial sensor-based orientation, positioning and control solution for a diverse array of marine and subsea applications.  It has been designed to meet the exacting standards for heave, surge, sway, angular rates, accelerations, heading, velocity and positioning required by maritime and hydrographic applications for any type of... (read more)
2016-10-31 09:01:43

Sonardyne Motion Sensor Technology

Sonardyne International has launched a new marine Attitude Heading and Reference System (AHRS): Lodestar. Lodestar has been developed to overcome the problems associated with conventional sensor platforms. The Lodestar AHRS is a natural extension of the Sonardyne product range and has been developed for seamless integration with the company’s widely used LBL (Long BaseLine) and USBL (Ultra-Short BaseLine) acoustic positioning systems. It will also be welcomed by users with any requirement for motion compensation to support operations in any sea conditions. These are likely to include platform stabilisation, dynamic positioning, buoy monitoring, subsea construction and towfish and ROV/AUV operations. Available... (read more)
2007-04-05 02:42:46

Motion Sensor Performance

Direct Comparison Using 2005 Common Dataset
Integral components of a swathe bathymetry system are the motion and heading sensors. The current trend is to offer a system that combines both components in one package, either as an aided inertial sensor or as two sensors linked by component software. The quality of these inertial sensors has a direct effect on the quality of the final survey. This paper compares five leading available sensors, concluding that they produce markedly differing results. Most surveyors when purchasing or specifying a particular inertial system for a project will base their decision on information generated by the manu-facturers, which often shows all... (read more)
2008-01-01 01:00:00

Marine Motion Sensor

Kongsberg Maritimes has introduced a new member in its family of Motion Monitoring Units at Ocean Business 2015. The MRU 5+ MK-II is part of a range of MRUs for diverse marine applications including: motion compensation of multi-beam echo sounders, high speed craft motion control and damping systems, heave compensation of offshore cranes, dynamic positioning, hydro acoustic positioning, ship motion monitoring, ocean wave measurements and antenna motion compensation and stabilisation. The MRU 5+ MK-II uses a new sensing element (Coriolis force resonator) in the new design of integrated MEMS gyros. With less than 0.002° angle noise, and Angle Random Walk... (read more)
2015-04-18 12:03:00

Gyrocompass and Motion Sensor

The OceanFOG north-seeking gyrocompass is a compact survey-grade gyro offering extremely fast run-up times of less than three minutes and also features an integral motion sensor that calculates heave to a typical accuracy of 5cm or 5%. Unlikeolder and potentially unreliable ring-laser gyros with their inherent longrepair times, the OceanFOG uses state of the art fibre-optic gyros and MEMSaccelerometers. What setsthe OceanFOG has a standard list price at around two-thirds of the price of itsnearest competitor and that is comes with a conditional lifetime warranty.   (read more)
2010-09-20 05:01:52

Seabed in Motion

How ripples and waves determine sand-grain movement
Despite its great practical importance, we still have much to learn about the transport of sand grains in the coastal environment. This mainly due to the complexity of sand transportation processes influenced by both waves and net currents like the tide. Here an overview of recently completed PhD research that yielded new insights into, and predictive models for, wave-induced sand transport over rippled beds. Coastal regions and shallow shelf seas like the North Sea are increasingly subjected to human activity. Cities, harbours and industry are situated near the coastline, and farther offshore the seabed is used for the construction of... (read more)
2008-01-01 01:00:00

Sonar Interface Unit

The Octopus 160 sonar interface unit's design and is compact, rugged and weather-proof. Compatible with EdgeTech's work-horse 272TD dual-frequency side-scan sonar, it is simple to operate and is suitable for small boat use in many types of underwater survey. Housed in a rugged custom Pelicase, the 160 is highly portable and it can be operated with the lid closed allowing uninterrupted operation in harsh environments.   Another popular feature is the new user interface for all controls and once configured for a specific towfish, this needs no further adjustment. With direct connection to standard EdgeTech 272TD tow cables and full... (read more)
2009-10-09 10:21:17

SeeTrack Offshore Unit Sales

Subsea 7 is to receive two new Hercules Remotely Operated Vehicles (ROVs), currently being manufactured by SMD, fitted with SeeByte's Dynamic Positioning system; SeeTrack Offshore. The vehicles will add to the leading contractors' existing fleet of ROVs which provide services to the Subsea Umbilical, Riser and Flowline (SURF) sector.   SeeTrack Offshore adds additional automation to the ROV control process by providing the ability for the ROV to automatically maintain a fixed position above the seabed or follow a programmed course and speed. The system runs on the surface and is contained in a 19 inch rack. With SeeTrack Offshore... (read more)
2008-05-19 04:49:44

Motion Solution for Marine Applications

Coda Octopus and Hemisphere GNSS introduced integrated position, heading and attitude solutions for marine-based applications. Designed in a compact form factor for rapid deployment, the F175-H solution combines Hemisphere Global Navigation Satellite System (GNSS) receivers and Coda Octopus inertial technology. By tightly coupling the raw GNSS outputs from the Hemisphere VS GNSS receiver with the high-grade Inertial Measurement Unit (IMU) from Coda Octopus, the F175-H delivers outstanding performance at an affordable price for a host of marine applications including imaging, mapping, security, construction and survey. (read more)
2015-04-16 10:15:24
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