Sonardyne’s Calibration-Free Acoustic Positioning Delivers Client Savings

Tuesday, August 23, 2011
Sonardyne Lodestar GyroUSBL

Sonardyne’s Calibration-Free Acoustic Positioning Delivers Major Savings for CSA International.
 
CSA International Inc, an environmental survey company working in the Gulf of Mexico, has become the first organisation in the world to purchase a new, ‘calibration-free’ acoustic positioning system launched by Sonardyne International Ltd. The GyroUSBL integrates Sonardyne’s Lodestar Attitude and Heading Reference System (AHRS) and sixth generation (6G®) Ultra-Short BaseLine (USBL) transceiver into a single unit and was shown to offer significant operational benefits during a deep water ROV survey carried out this summer.  
 
Most USBL positioning systems need to undergo a calibration process to determine the precise alignment offsets between the acoustic transceiver and the vessel’s own attitude sensors. This is often a time consuming exercise involving the vessel undertaking specific manoeuvres over several hours whilst all the necessary data is collected and then processed.  
 
With Lodestar GyroUSBL, any sensor offsets have largely been removed by the tight mechanical coupling of the survey-grade AHRS unit and the USBL array during its assembly and calibration at Sonardyne’s factory. This integration also enables the attitude sensor data latencies associated with conventional USBL set-ups, to be virtually eliminated, further improving precision and accuracy. Lodestar GyroUSBL can therefore be deployed on any vessel and put to work very quickly without users first having to perform a calibration.
 
The Lodestar GyroUSBL was supplied to CSA as part of a Sonardyne Ranger 2 positioning system and was installed on an over-the-side deployment pole fitted to the offshore supply vessel ‘HOS Sweetwater’. During the survey, the Lodestar GyroUSBL was put to the test tracking an ROV as it descended to 1,478 metres. Out-of-the-box, the factory calibration produced a slant range accuracy result of 4.25m (0.3%).  For many projects, this performance would meet positioning specification however it was decided that a single calibration would be run to make a fine determination of the pitch roll alignment errors. This further improved the slant range accuracy to 1.9 metres, or just 0.13% of water depth.
 
Because of their versatility, USBL systems are routinely moved from vessel-to-vessel to support a wide range of subsea tasks. As soon as this happens, then the relationship between USBL transceiver and the attitude sensors is lost. The only way to re-establish the relationship is to re-calibrate the system on the new vessel. As the Lodestar GyroUSBL is a combined unit, the precise alignment is carried within the unit meaning that when installed on a new vessel, a repeat calibration is not required. A simple ‘spin-test’, which can be performed on-route to the vessel’s work location, is all that is now advised to verify the GPS antenna offsets for the new installation.
 
Eddie Walsh, CSA Operations Supervisor, said, “The performance of the entire Ranger 2 system was very impressive. In addition to the pre-calibrated Lodestar GyroUSBL, we were able to track the ROV at a 1Hz update while simultaneously tracking three individual transponders using different tracking scenarios.” He added, “The through-life savings in vessel day rates due to the elimination of repeated calibrations will ensure that the Lodestar GyroUSBL will pay for itself very quickly. In the future, when we install the system on a different vessel, we can begin work with minimal vessel delays.” www.sonardyne.com.

Maritime Reporter June 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

QinetiQ Signs Contract with ASV

QinetiQ, as part of a new Marine Surface Target Service, has signed a contract with Autonomous Surface Vehicles (ASV) for the supply and operational support of autonomous surface target vessels.

GTT Wins DSME Order for 9 More Icebreaking LNGCs

Gaztransport & Technigaz (GTT), a designer of membrane containment systems for the maritime transportation and storage of Liquefied Natural Gas (LNG), announced

Bollinger to Build 6 More FRCs for the USCG

Bollinger Shipyards, Inc., Lockport, Louisiana, announced the award of six additional USCG Sentinel Class Fast Response Cutters (FRCs). The U. S. Coast Guard

Technology

ABS, MPA to Collaborate on Maritime R&D

ABS and the Maritime and Port Authority of Singapore (MPA) signed a memorandum of understanding (MOU) today to promote maritime research and development (R&D) and innovation.

GTT Wins DSME Order for 9 More Icebreaking LNGCs

Gaztransport & Technigaz (GTT), a designer of membrane containment systems for the maritime transportation and storage of Liquefied Natural Gas (LNG), announced

Maritime NZ Oil Spill Response Review: Submissions

Maritime New Zealand (MNZ) says it invites submissions on its draft updated New Zealand Marine Oil Spill Response Strategy 2014 (the draft Strategy). The draft Strategy, (available at http://bit.

Marine Electronics

More VDR Orders for Danelec in China

Danelec Marine has received orders to supply Voyage Data Recorders (VDRs) and Electronic Chart Display and Information Systems (ECDIS) for 18 offshore support vessels in China.

Seafarers Beware – Social Media Ahead

Videotel, part of KVH Industries, Inc., has launched a new program, Social Media at Sea, addressing the unique dangers of inappropriate use of social media by shipboard

Jacksonville Adds PORTS Real-time Data System

Officials from NOAA, the Jacksonville Marine Transportation Exchange, and the Jacksonville Port Authority officially dedicated a new information system today

Marine Propulsion

Volvo Penta Diesel Sterndrives for Metal Shark Patrol Boats

Metal Shark now offers Volvo Penta diesel sterndrives in its 29 Defiant patrol boats for customers requiring optimum performance, durability and maneuverability.

Wilhelmsen Secures Inert Gas System Orders

Breakthrough order in Japanese shipbuilding market sees largest ever capacity Maritime Protection IG units delivered for leading domestic owners. Wilhelmsen

MTU Powers Fleet of Inland Waterway Towboats

Industry-leading Ironmen diesel engines power four new builds and two repowers in Southern Towing’s inland waterway fleet MTU, the specialist for propulsion

Offshore

6 MW Offshore Wind Turbine of Siemens Certified

Siemens Energy has obtained type certification of DNV GL for the company's innovative D6 offshore wind turbine. The model Siemens SWT-6.0-154 is equipped with a modern direct drive generator,

Turkey Approves EIA Report for South Stream’s Offshore Section

The Ministry of Environment and Urban Planning of Turkey approved the Environmental Impact Assessment (EIA) Report and issued a positive opinion of the EIA results

BW Offshore to Fully Own FPSO Petroleo Nautipa

Following to BW Offshore's announcement of 9 July 2014, BW Offshore has signed a sale and purchase agreement with Yinson to take 100% ownership of the FPSO Petroleo Nautipa,

Workboats

Concordia Tow Update: Smooth Sailing

The Costa Concordia wreck removal team reported this morning at 10:30 a.m. that after 22 hours of navigation, the convoy was over 50 miles off Giglio Island with about 140 miles from Genoa Prà-Voltri.

MTU Powers Fleet of Inland Waterway Towboats

Industry-leading Ironmen diesel engines power four new builds and two repowers in Southern Towing’s inland waterway fleet MTU, the specialist for propulsion

New Crewboat Design for Offshore O&G Market

Upgraded crewboat design employs carbon-reinforced composite materials and is lighter, faster and more fuel-efficient than alternatives. Marine Oil Transportation

Marine Power

6 MW Offshore Wind Turbine of Siemens Certified

Siemens Energy has obtained type certification of DNV GL for the company's innovative D6 offshore wind turbine. The model Siemens SWT-6.0-154 is equipped with a modern direct drive generator,

Volvo Penta Diesel Sterndrives for Metal Shark Patrol Boats

Metal Shark now offers Volvo Penta diesel sterndrives in its 29 Defiant patrol boats for customers requiring optimum performance, durability and maneuverability.

MTU Powers Fleet of Inland Waterway Towboats

Industry-leading Ironmen diesel engines power four new builds and two repowers in Southern Towing’s inland waterway fleet MTU, the specialist for propulsion

 
 
Naval Architecture Offshore Oil Pipelines Pod Propulsion Port Authority Ship Electronics Ship Repair Ship Simulators Shipbuilding / Vessel Construction Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1796 sec (6 req/sec)