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

CUBE: Extended Applications

Many hydrographers consider the Combined Uncertainty and Bathymetry Estimator (CUBE) algorithm a useful aid in processing bathymetric data and ‘measuring’ survey quality. This paper discusses extending the use of CUBE to include determining multi-beam echo sounder (MBES) offset parameters and navigation offsets between overlapping survey lines. One critical process in MBES surveying is determining system offset parameters by conducting a patch-test. Roll offset is typically recognised by unrealistic bottom slopes. Pitch, time and yaw offsets are recognised by seafloor features appearing dis- placed when surveyed on different lines where survey speed and/or direction vary. Detecting displacements is difficult in shallow... (read more)
2008-01-01 01:00:00

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

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

Record OCTANS Month in USA

IXSEA Inc. received orders for a total of 23 OCTANS AHRS over the past month. This brings to over 70 units sold in the USA in 2008.   Launched in 1998, OCTANS became the first survey-grade fully integrated gyrocompass to meet IMO (International Maritime Organisation) standards in 2001. It is based on IXSEA's truly solid-state Fiber Optic Gyroscope (FOG) technology.   The OCTANS gyrocompass and complete motion sensor, based on FOG technology, outputs true heading, roll, pitch, surge, sway, heave, speed, acceleration and rate of turn and settles at sea in less than three minutes. In 2006, IXSEA launched the... (read more)
2008-10-10 10:51:11

GL Certification for Tidal Energy Converter Prototype

Germanischer Lloyd (GL) Renewables Certification (GL RC, Germany) is to certify Kawasaki Heavy Industries' (KHI) tidal energy converter prototype. The certification will be carried out according to GL RC's Guideline for the Certification of Ocean Energy Converters and other relevant GL RC rules and guidelines for marine and offshore structures. KHI's tidal energy converter is currently under development at KHI's Akashi facility and will soon be installed at the European Marine Energy Test Centre (EMEC) in Orkney, Scotland/UK. The prototype certification by GL Renewables Certification will include assessment of the prototype design which demonstrates the fulfilment of the requirements in... (read more)
2012-04-23 10:13:18

Commercially Exportable IMU-KVH1750 Added to SPAN Line

NovAtel, Canada, has added the IMU-KVH1750 as an inertial measurement unit (IMU) option in its SPAN GNSS/INS line of positioning products. The IMU-KVH1750 is a high-performance commercial off-the-shelf (COTS) sensor that offers excellent bias stability and repeatability. It incorporates KVH’s DSP-1750 precision fibre optic gyro with very low noise MEMS accelerometers. Commercially exportable, the IMU-KVH1750 integrates easily with NovAtel’s OEM6 series of receivers to provide a tightly coupled 3D navigation solution. Offering customers continuous position, velocity and attitude (roll, pitch and azimuth) measurements, a SPAN system is stable and available even through periods when satellite signals are blocked or unavailable.... (read more)
2014-04-10 09:23:31

Logging Compass

AOSI's newest EZ-Compass-3AL Logging Compass incorporates a three-axis magnetometer with tilt and temperature compensation and a high capacity integrated logger that allows independent storage of up to 20,000 measurements, which are easily transferable to any PC. The 1.5" x 2.0"x 0.5" module weights about 11gr and outputs heading, pitch, roll, magnetic field and temperature over RS232 and RS422/RS485 ports by using all solid state components.   Compass measures tilt angles up to +-90 arcdeg (+-180 optional) and includes tilt linearization, hard and soft iron calibrations. EZ-Compass-3AVL is a vertical version and EZ-Compass-3AHL is the horizontal version. Both versions fit 0.9"... (read more)
2009-04-07 03:07:02

Subsea Construction

Century Subsea has taken delivery of a first, with an option for a second, Kongsberg Maritime Subsea HAIN, (Hydroacoustic Aided Inertial Navigation) for a 90-day project in the Gulf of Mexico for a major oil company. Subsea HAIN, developed from the HUGIN AUV navigation system, has now been used in several deepwater projects to enable increased accuracy of underwater positioning with minimal sub-sea hardware, thus significantly reducing sub-sea construction costs. Century Subsea has also purchased a new-generation HiPAP 350P (Portable) USBL System. The HiPAP 350P has the pitch-and-roll sensor mounted in the transducer head, providing the optimal solution for minimising... (read more)
2005-10-15 12:00:00

NovAtel Launches GNSS+INS Positioning Device

NovAtel, Canada, has recently added the IMU-ISA-100C as an Inertial Measurement Unit (IMU) option to its SPAN GNSS+INS line of positioning products. The IMU-ISA-100C is a near navigation grade IMU for platform stabilisation, general purpose navigation, photogrammetry, remote sensing and ground mobile mapping applications. Commercially exportable, the IMU-ISA-100C integrates easily with a NovAtel SPAN capable receiver to provide a tightly coupled 3D navigation solution. Offering customers continuous position, velocity and attitude (roll, pitch and azimuth) measurements, a SPAN system is stable and available even through periods when satellite signals are blocked or unavailable. With the IMU-ISA-100C, customers will receive near... (read more)
2014-08-25 08:48:17
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