Sea Technology

MAR 2013

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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(Top) CIDCO quay wall survey in the Port of Quebec, showing integrated laser and multibeam information, as well as detection of object on the seafoor within short proximity. Beneath is a deformation map of the quay wall where green is zero deformation, purple is 0.6 meters of gouging, and orange is 0.6 meters of protrusion. (Credits: CIDCO) (Right) Wedge display of the RESON SeaBat 7125 multibeam echosounder with Tracer activated. The screen shows overlay of intensity vales and color coded uncertainty information while using Flex Mode to track debris near the Port of Savannah. (Credit: EMC Surveys Inc.) standard personal computer components, such as central processing units, video-card graphics processing units and RAM. To address route survey requirements, including those for Q-route surveys, RESON introduced a programmable beamformer in 2010 that utilizes equiangular (EA) and equidistant (ED) bottom detection modes, separately or combined. The use of EA and ED has been well-documented in literature, however, combining the two detection methods into a single swath is just now being implemented. A programmable beamformer allows the user to defne the density of three sectors within the swath: two low-density ED and one high-density EA. The density of each sector is user-defned and allows the operator to focus on obtaining the highest resolution over the primary route while also obtaining information in the secondary outer section of the corridor. This feature is called Flex Mode. In a demonstration near the Port of Oslo in Norway in 2011, the operator detected 25-centimeter-diameter circular debris on the seafoor and, utilizing Flex Mode, obtained 155 soundings per ping within a 25-centimeter diameter while maintaining a 140-degree swath. Further, the operator can also implement beam steering of the entire sector, the high density sector or both to ensure the region of interest is always properly resolved. At the Port of Savannah, Georgia, in January 2013, RESON implemented automation routines to further improve the effcacy of Q-route surveys. At the core of RESON���s sonar automation is Tracker, which allows the surveyor to get high-quality data, regardless of seafoor substrate, without the need of constant supervision. It dynamically adapts sonar settings to the environment, ensuring the system is not oversaturated and bottom detection is optimized. In addition to Tracker, RESON will introduce in 2013 real-time feature tracking that is activated when targets show a continuous trend (i.e., pipelines, cables, trenches, debris felds). This tracking algorithm is also designed to work the beam steering such that the sonar automatically maintains www.sea-technology.com MARCH 2013 / st 11

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