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 Today


The Maritime Industry's original and most viewed E-News Service

Maritime Reporter June 2016 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

“Twiggy” Baker Wins BWT Puerto Escondido Challenge

Grant “Twiggy” Baker (ZAF) claimed victory today at the Puerto Escondido Challenge, besting a field of 24 of the world’s best big wave surfers in towering 20-to-35

Winners of International Seafarers' Welfare Awards

The winners of ISWAN's International Seafarers' Welfare Awards 2016 were announced on 24th June at a high-profile ceremony held in Manila, the Philippines. The

Maritime Needs More Women Power

United Nations  International Maritime Organization (IMO) Secretary- General Ki Tack Lim pushed for the increased involvement of women in the seafaring industry

Technology

Denmark Adopts Digital Ship Certification

As of June 24, 2016, ships flying the Danish flag are being digitally certified, making Denmark one of the first countries to put an end to the 100-year-old tradition

Prince Charles Places Final Section of UK Aircraft Carrier

The second of the largest warships ever built for the U.K. Royal Navy, the Queen Elizabeth Class carrier HMS Prince of Wales, was given the royal seal of approval when HRH The Prince of Wales,

US Navy Accepts Delivery of Future USS Montgomery

The U.S. Navy has accepted delivery of future USS Montgomery (LCS 8) during a ceremony on June 23 at the Austal USA shipyard in Mobile, Ala.   Marking the official

Marine Electronics

Denmark Adopts Digital Ship Certification

As of June 24, 2016, ships flying the Danish flag are being digitally certified, making Denmark one of the first countries to put an end to the 100-year-old tradition

PGS, Radio Holland Expand Service Agreement

Norwegian marine geophysical company PGS has extended its non-exclusive service agreement with Radio Holland for navigation and communication services onboard nine seismic vessels in its global fleet.

AkzoNobel Wins Major Environmental Award

AkzoNobel’s pioneering methodology for rewarding ship owners who use sustainable hull coatings has been named Environmental Leader Product of the Year for 2016.

Offshore

POSH Bags Shell FLNG Contract

Singapore’s offshore marine services provider PACC Offshore Services Holdings Ltd. (POSH) has been awarded a contract to support Shell’s Prelude floating liquefied

US Oil Drillers Cut Rigs after 3 Weeks of Additions

U.S. oil drillers cut rigs this week for a 20th week this year after three weeks of additions, according to a closely followed report on Friday, as crude prices

Subsea 7 Announces PLSV Swap off Brazil

Subsea 7 S.A. said it has reached an agreement with Petrobras to substitute a pipelay support vessel (PLSV) working off Brazil.   The agreement will see the Subsea-7-owned

Workboats

Alabama Pilots Order High-speed Launch from Gladding-Hearn

The Alabama Pilot, Inc., in Mobile, Ala., has ordered a Chesapeake Class pilot boat from Gladding-Hearn Shipbuilding, Duclos Corporation. Delivery of the new 53-footer is scheduled for mid-2017.

SeaPro FourStroke Making Gains in the Commercial Market

Mercury Marine’s family of SeaPro FourStroke outboard engines is suited for high-hour applications and harsh environments, according to the manufacturer, who said

Ulstein Delivers for BS Offshore

The first of two service operation vessels (SOV) ordered in 2015 by Bernhard Schulte Offshore (BS Offshore) and its client Siemens from Ulstein Verft in is now completed,

Marine Power

Maritime Needs More Women Power

United Nations  International Maritime Organization (IMO) Secretary- General Ki Tack Lim pushed for the increased involvement of women in the seafaring industry

DMCA Showcases Local Maritime Leadership

Dubai Maritime City Authority (DMCA) showcased Dubai's global maritime leadership in the presence of a high-level delegation from City of Glasgow College who commended

Brexit: What Next for Shipping Markets?

For many in shipping, the Brexit was unexpected. Many believe that Brexit’s impact on the shipping industry will be more or less neutral.   The UK Chamber of

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Standards Naval Architecture Offshore Oil Ship Electronics Ship Repair Ship Simulators Shipbuilding / Vessel Construction Winch
rss | archive | history | articles | privacy | 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: 0.1357 sec (7 req/sec)