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 March 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

Scandlines Ferry Back in Service by End June

The damaged Scandlines ferry M/V Prinsesse Benedikte is being repaired at the Polish shipyard Remontowa and is expected to be ready before the end of June 2015.

Greece Will Sell Piraeus Port Stake in Weeks

The Greek government will sell its majority stake in the port of Piraeus within weeks, the country's deputy prime minister told China's official Xinhua news agency,

USNS Spearhead Delivers Materials to Ghana Charities

  The U.S. Navy’s joint high-speed vessel USNS Spearhead (JHSV 1) delivered wheelchairs and medical supplies to Ghanaian non-governmental organizations March 26, 2015.

Technology

US Navy to Roll out Underwater Spy Satellites

The robotic series that remade crusade in skies will shortly extend to a low sea, with underwater view “satellites,” drone-launching pods on a sea building and unmanned ships sport submarines,

India May Add Japanese Soryu-Class Submarines to its Fleet

India is reportedly considering a project to incorporate six Japanese Soryu-class diesel-electric submarines into its fleet, says The Japan Times.   The Defense

Austal Graduates 48 4-Yr Apprentices

Austal USA combined two classes to graduate a total of 48 members of Austal’s cutting-edge four-year apprenticeship program yesterday at a formal ceremony held at the Arthur R.

Marine Electronics

Washington State Ferry Tacoma Returns to Service

Washington State Ferry M/V Tacoma will return to work on the Seattle/Bainbridge Island route starting March 28 after suffering electrical damage last summer.   The

SimCity

Building Capacity, as Deadline for Trained Crews Nears   “You see that ship. That’s our ship,” says Karsten Saevik, as he directs our attention to the virtual

Maritime Training Five Years from Now: A Look Ahead

For anyone involved in maritime training, now is an incredibly exciting time full of opportunity. More than ever before, there are new advanced techniques and technologies

Offshore

China Unveils Action Plan on Maritime Silk Road

China has unveiled the principles, framework, and cooperation priorities and mechanisms in its Maritime Silk Road initiative in a bid to enhance regional connectivity

JV Wins $2bln Freeport LNG Contract in US

A joint venture (JV) between CB&I, Chiyoda International and Zachry Industrial has won a contract worth over $2bn from FLNG Liquefaction 3 for a liquefied natural

Feds Delay LNG’s Port Ambrose Application

The US Coast Guard and the US Maritime Administration (MARAD) have temporarily suspended their review of the proposed Port Ambrose deep-water LNG import terminal.

Workboats

Shipping Season Opens on the Mississippi

First tow marks unofficial opening to Mississippi River navigation season   M/V New Dawn arrived at Lock and Dam 2 near Hastings, Minn. Wednesday morning, marking

Two ASD Tugs Delivered to URAG

URAG has taken delivery of two ASD 2411 Tugs to add to its existing fleet. Named Brake and Perfect, the new vessels have joined their sister ship Prompt in the

Plans in Place to Test Intermodal River Transport

The Paducah-McCracken County Riverport Authority and Ingram Barge Company has announced plans to assess the viability of Intermodal River Transportation, utilizing

Marine Power

USA Urged Not to Delay Arctic Drilling

The U.S. should immediately begin a push to exploit its enormous trove of oil in the Arctic waters off of Alaska, or risk a renewed reliance on imported oil in the future, reports AP.

US Navy to Roll out Underwater Spy Satellites

The robotic series that remade crusade in skies will shortly extend to a low sea, with underwater view “satellites,” drone-launching pods on a sea building and unmanned ships sport submarines,

China Unveils Action Plan on Maritime Silk Road

China has unveiled the principles, framework, and cooperation priorities and mechanisms in its Maritime Silk Road initiative in a bid to enhance regional connectivity

 
 
Maritime Security Offshore Oil Pipelines Pod Propulsion Port Authority Salvage Ship Simulators Shipbuilding / Vessel Construction Sonar 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: 0.3795 sec (3 req/sec)