The MRU and SRF Aligned (I)

With increasing accuracies of positioning and multi-beam systems, alignment of the motion reference unit (MRU) is becoming increasingly important. Although most (if not all) multi-beam surveyors use the patch-test to resolve the angular offsets between the multi-beam head and the MRU, this test does not give us the angular offsets between the MRU and the ship’s reference frame (SRF). In addition to this, any misalignment between the vertical rotation axis of the MRU and the SRF (yaw-angle) will introduce cross-talk between pitch and roll.<P> The alignment of the threeaxes is also becoming increasingly important at shallower depths as we should... (read more)
2009-01-05 12:00:00

Young Marine Scientists' Day: Call for Abstracts

During the 14th edition of the VLIZ Young Marine Scientists' Day, which is to be held on 7 March 2014 in Bruges, Belgium, the diversity, quality and relevance of marine and coastal sciences in Flanders is to be highlighted. The organisers challenge all marine and coastal scientists to prepare a short abstract presenting their research in a clear, concise and attractive way. The abstract should be of maximal 500 words and submitted by 16 December 2013. Twenty abstracts will be selected for a plenary session of short pitch presentations. The other participants will be able to present their work in... (read more)
2013-12-09 10:32:50

New Ball Joint Monitoring System

Nautronix delivered the first of a new system to its customer GlobalSantaFe for its vessel, Glomar Arctic III. The new Ball Joint Monitoring system integrates data from the Nautronix USBL positioning systems, in this case a RS914, and vessel data to provide a complete monitoring system. The system meets requirements put on GlobalSantaFe by their customer to provide continuous monitoring, logging and alarm capabilities for the lower ball joint, and related vessel data. The system also reads vessel pitch, roll and heave information, all of which is displayed and logged. The system also provides full monitoring capability and to view... (read more)
2004-03-25 12:00:00

Gliders Detect Endangered Whales

Two gliders equipped with instruments designed to 'listen' for the calls of baleen whales detected nine endangered North Atlantic right whales in the Gulf of Maine, USA, in December 2012. The robots reported the detections to shore-based researchers within hours of hearing the whales (i.e. in real time), demonstrating a new and powerful tool for managing interactions between whales and human activities. The team of researchers, led by Woods Hole Oceanographic Institution (WHOI, USA) scientists Mark Baumgartner and Dave Fratantoni, reported their sightings to the USA-based NOAA, which is responsible for enforcing the Marine Mammal Protection Act. First Detection of... (read more)
2013-01-24 09:42:10

Technology in Focus: Inertial Navigation Systems

Bridging the Positioning Gap
Inertial Navigation Systems (INSs) are a great help in applications where either position stability is of great importance or where bridging (small) positioning gaps is a requirement. To understand INS, imagine you are standing blindfolded in the centre of a long hallway. Then you start walking. You may proceed quickly at first, compensating as needed and covering ground with confidence. Eventually, however, you begin to lose your sense of alignment. This ability to successfully navigate when denied a visual frame of reference, even for a relatively short amount of time, represents our own basic human form of inertial navigation. An... (read more)
2016-08-25 11:33:17

Innovative Solutions and Proactive Approaches

CEDA’s Iberian Conference 2016
At the end of October 2016, the Central Dredging Association (CEDA) co-hosted a conference with the Portuguese Engineers Association (OE) in Lisbon, Portugal. The CEDA Iberian Conference: Dredging for Sustainable Port Development attracted over 120 participants and addressed key topics relevant to the success of port dredging and sediment management projects, with a focus on the Iberian Peninsula. On behalf of the co-organiser, Mr Carlos Loureiro, OE vice-president, stressed that the shared objectives, of the creation and dissemination of high-quality knowledge, made CEDA and OE ‘natural’ partners in presenting the event. Comprehensive Programme The conference started with a short introduction... (read more)
2016-11-22 08:50:23

Long-range AUV Passes First Trials

Autosub Long Range has successfully completed its first set of sea trials at a location in the deep Atlantic Ocean, 300 miles south-west of the Canary Islands. Hosted by research ship the RRS Discovery, this is the latest in the Autosub series of autonomous underwater vehicles (AUVs), . Autosub Long Range is a new type of AUV developed at the National Oceanography Centre (NOC) in Southampton, UK. By travelling rather slowly (0.4 metres per second), and keeping a tight rein on the power available to its sensors, it will be capable of missions of up to six months duration and... (read more)
2011-03-11 01:50:42

Marine Construction Receivers

Trimble has introduced two new Global Positioning System (GPS) receivers designed specifically for marine construction applications: the Trimble SPS361 and Trimble SPS461 GPS Heading Receivers. These dedicated marine receivers deliver both precise GPS heading together with Differential GPS (DGPS) or Real Time Kinematic (RTK) positioning.   The receivers are developed for a range of applications when used with Trimble HYDROpro marine software, including: the precise placement of structures such as piles, bridges, caissons, marinas, and coastal defenses; dredge head positioning; vessel positioning and tracking; and offshore rig positioning with anchor handling.   The Trimble SPS361 is an entry-level DGPS Heading... (read more)
2009-03-12 11:04:44

Two New INS Solutions Launched

Two separate Inertial Navigation Systems are arrived at CDL during at this year’s Ocean Business event in Southampton, UK. The MiniPOS3 and MiniSense2 offer INS solutions to suit either end of the cost - performance spectrum.   CDL’s most advanced system ever, the MiniPOS3, is a full Inertial Navigation System (INS) providing highly accurate heading, pitch and roll alongside multiple aiding options including USBL, LBL, DVL and GPS to provide a positioning solution that eliminates almost all of the inherent noise and availability issues of traditional positioning systems. Developed from the successful MiniPOS2 system the addition of USBL/LBL aiding provides... (read more)
2011-04-06 03:44:56

Jasco Amar Mission to Venus Ocean Observatory

JASCO Applied Sciences has commenced an AMAR product demonstration and data gathering mission on the Venus Ocean Observatory. Two of JASCO’s AMARs have been deployed at two different locations on the Venus Ocean Observatory in the Strait of Georgia, Canada. The primary purpose is to demonstrate the multi-sensor, real-time data collection and streaming capability of JASCO’s AMAR product. Of specific interest to JASCO are the real-time detection, identification and localisation of individual southern resident killer whales. The AMAR is JASCO’s product offering for the real-time collection and delivery of data and information for ocean observing. AMAR enables scientists to collect... (read more)
2014-03-17 02:29:01
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