Valeport's Improved Sound Velocity Sensors Reach New Pitch

Valeport's innovative approach to oceanographic instrumentation has resulted in a series of incremental improvements to their world-leading Sound Velocity sensors. Customers with existing products can also benefit from the product improvements, with these upgrades being available upon request during routine service and calibration at Valeport.   The Sound Velocity sensors have had changes made to the timing system and signal processing algorithms which now enable unrivalled levels of accuracy at ±0.020m/s.  These products will also work in an operating range of 1375 to 1900m/s, covering all known environments including the Dead Sea and Marianas Trench.  In addition, the products now... (read more)
2009-03-30 03:44:29

GPS/GLONASS RTK Receiver Module

The Ashtech MB100 GNSS board has been developed for applications when power consumption, size and dependable performances such as raw data quality, real-time positioning (SBAS up to RTK) or GNSS heading + pitch/roll determination are critical. The MB100 is designed to address L1 GPS+SBAS applications - including heading + pitch/roll determination. Ashtech’s Z-Blade Technology and dual-frequency GPS configuration offerlong-range RTK performance, while single-frequency GPS + GLONASS configuration provides more satellites in view for demanding environments. Embedded Z-Blade GNSS centric technology uses all available GNSS signals equally, without any constellation preference, to deliver fast and stable solutions. The MB100 works as... (read more)
2013-06-06 10:10:46

The MRU and SRF Aligned (II and III)

The alignment of the motion reference unit (MRU) is important for the accuracy of a multi-beam survey. The patch test is mostly used to solve angular offsets between the multi-beam head and the MRU; however, this does not solve all the aspects that must be taken into account. This article in two parts describes the method used by the Survey Department of the Directorate-General for Public Works and Water Management (Rijkswaterstaat; The Netherlands), which for reference purposes in this article we shall call the ‘Dutch method’.<P> As explained in Part I in theprevious issue of Hydrointer­national, the alignment of the... (read more)
2009-01-05 12:00:00

Ixsea at Dsei 2009

Ixsea, the world leader in Fiber Optic Gyroscope (FOG) technology, will be exhibiting at the Defence Systems & Equipment International show, which will be held from 8th to 11th September in London (UK). The company will present its navigation an positioning solutions for naval and land applications.     The Marins, specifically designed to meet the demands of the navy for high-accurate INS. Octans, an IMO-certified gyrocompass, designed with a complete motion sensor that outputs true heading, roll, pitch, surge, sway, heave, speed and acceleration. Gaps, a portable and pre-calibrated acoustic tracking system, capable to track any type of targets... (read more)
2009-07-21 01:44:50

SBG Products Supported by Software Suppliers

The Ekinox Series (surface and subsea sensors) by SBG Systems (France) is supported by Hypack and QPS hydrographic software. The Ellipse Series of miniature inertial sensors is supported too as it shares the same protocol as the Ekinox. Additionaly, the sbgCenter now delivers a CARIS-compatible export format. HYPACK has recently completed HYPACK and HYSWEEP device drivers for the SBG Systems Ekinox Inertial Navigation Systems. Ethernet and Series connection is available and all parameters are supported: roll, pitch, heading, position, heave, delayed heave, UTC, etc. The Ekinox Series and Subsea Series and the new Ellipse Series are totally supported by the... (read more)
2014-12-15 10:29:15

VLIZ Marine Science Day: Call for Abstracts

Vlaams Instituut voor de Zee (VLIZ) is issuing a call for abstracts leading to presentations on the VLIZ Marine Science Day, taking place on 3 March 2017 in Bruges, Belgium. Final deadline for submission is 15 January 2017. The VLIZ Marine Science Day 2017 will for the 17th time highlight the diversity, quality and relevance of marine and coastal sciences in Flanders with a selection of oral pitch presentations. In the afternoon, an extensive poster session, demo sessions and the events ‘Meet the Company’ and ‘Speed date networking’ are programmed. During the VLIZ Marine Science Day 2017, the public as... (read more)
2016-11-23 08:51:03

Automatic Patch Test and Side-Scan Mosaic Tools in NaviModel 3.3

Version 3.3 of the EIVA NaviModel software solution has been released, offering both improved as well as new features, including an automatic patch test module and side-scan mosaic tools. NaviModel version 3.3 allows for 3D, and thus more precise, patch testing, as opposed to previous versions that were based on profile scans. Also, users can create a custom display of the patch testing data, including graph selection. Side-scan mosaic has been a well-known component in other EIVA NaviSuite products for a while, and it is now also included in NaviModel. The mosaic tool encompasses multi-beam snippets, backscatter data and side-scan... (read more)
2013-11-29 11:07:31

Artefacts in Multi-beam Echosounder Data

This article is about my thesis project, which I did in collaboration with Auke van der Werf at the Dutch Nautical Academy at Terschelling (the Netherlands). The research for the thesis was done at the Dutch Directorate General for Public Works and Water Management (Rijkswaterstaat). This article presents a subset of the thesis. I would like to share the knowledge I gained and the lessons I learnt about lever-arm errors, motion time delays and yaw misalignment, which can result in dynamic motion residuals, also called artefacts or wobbles.<P>   Over the last decade, Rijkswaterstaat (part of the Dutch Ministry of... (read more)
2008-05-30 12:00:00

Hydrolite Portable Echosounder

Hydrolite is a portable echosounder designed for the Army Dive Teams for saltwater use.     The device has 1 cm accuracy at 20 meters. Options include mounting hardware, GPS/Datalogger, Software and Heave/Pitch/Roll capability. The illustration shows a lake survey accomplished with this echosounder.   (read more)
2008-11-10 02:51:49

Deep Trekker Vectored Thrust ROV Model

Modelled on the Deep Trekker DTG-2 Mini ROV, the Deep Trekker DTX2 is a subsea vehicle to combine the patented pitch mechanism that Deep Trekker is known for with 4 powerful, vectored thrusters for manoeuvrability unmatched in this vehicle class. Rated for depths of up to 300m and with speeds approaching 3.5 knots and 13 kgs of thrust, the DTX2 is as powerful and strong as it is nimble and easy to use. Integrating vectored thrusters allows for lateral movement in the horizontal plane, and by activating the pitch system, the DTX2 can achieve simultaneous vertical and lateral movement using... (read more)
2015-02-12 09:56:08
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