ROV Jason Tracked to Near 5000m12/12/2008
|A Ranger Wideband USBL (Ultra-Short BaseLine) acoustic positioning system from Sonardyne International has provided impressive performance for the engineers from the Deep Submergence Laboratory of Woods Hole Oceanographic Institution (WHOI) when it accurately tracked the Jason remotely operated vehicle (ROV) down to the seabed in 4,700 metres of water. The recent demonstration was carried out from onboard the R/V Thomas G Thompson in the Pacific Ocean off Hawaii where Woods Hole researchers regularly conduct deep ocean research cruises.|
Jason is a two-body ROV system designed and built by WHOI's Deep Submergence Laboratory. A 10 kilometre (6 mile) fibre-optic umbilical delivers electrical power and commands from the ship through Medea and down to Jason, which then returns data and live video imagery. Medea serves as a shock absorber, buffering Jason from the movements of the ship, while providing lighting and a bird's eye view of the ROV during seafloor operations.
On route to the trials site, a Sonardyne engineer had equipped Jason with an AvTrak 2 transceiver and Medea, with a directional Compatt 5 transponder. AvTrak 2 combines the functions of transponder, transceiver and telemetry link in one low power acoustic instrument that has been designed to meet the requirements of a variety of mission scenarios and vehicle types. Onboard the Thomas G Thompson, a Sonardyne 8023 Big Head surface transceiver, specifically developed for ultra-deep target tracking, was deployed on a temporary pole over the side of the vessel.
During the deepwater dive to almost 5,000 metres, the Sonardyne system was able to achieve a positioning accuracy of 0.32% of slant range, or +/-15 metres, despite the temporary, relatively flexible, over-the-side pole. This performance proved almost as good as WHOI's existing tracking system and far more convenient to use as no seabed transponders have to be deployed first. In addition, Jason's position could be updated at 1Hz despite the water depth which helped with visualisation of the ROV's dynamics.
AvTrak2 was installed on the ROV to demonstrate the unit's Wideband positioning and bi-directional wireless communications capability as if it were an AUV or manned submersible. This proved that data and commands could be reliably and easily sent from the USBL system on the vessel and back again using SMS (Sonardyne Messaging Service) in ultra deepwater.
Because the Ranger USBL system had shown its capabilities so convincingly, the WHOI team subsequently had the confidence to use it as the primary positioning tool for two further research dives to 2,500 metres that they conducted shortly afterwards.
Supplier: Sonardyne International Ltd
More news from this supplier:
6G Surveying and Structure Installation for Thien Nam Positioning
Sonardyne and Liquid Robotics Improve Data Recovery Options
SEAMEC Princess Upgrades to Sonardyne Ranger 2 Pro
Solstice Sidescan Sonar Demonstrated with Bluefin-12 AUV
Queen’s Award for Sonardyne 6G
Invitation for Acoustic Modem Field Evaluation Programme
Modem Field Evaluation Programme Launched at OI 2014
Subsea Technology & Rentals Expands Sonardyne Rental Pool
Anthony Gleeson Named as Sonardyne’s New Vice President for Asia
Sonardyne Ranger 2 GyroUSBL Touches Down
Optech at Asia Geospatial Forum
Important Rescue During New Multibeam Echosounder Test
Awards for Fugro Geotechnical Engineers
PSDM Brings Understanding in Central North Sea
Phoenix Continues Search for MH370
Fugro Strengthens Metocean Modelling Capabilities
Arrival of Offshore Support & Survey Vessel Geo Ocean II
SonarWiz Selected for Malaysian MH370 Search
NOC to Improve UK Flood Warning System
RV Sonne Commissioned
comments powered by Disqus
Generating Lat/Lon/Depth Files from Echoview
This video shows how to use Echoview to export a CSV file of the water depth as measured by an echosounder.