A recent trials partnership between Sonardyne International Ltd. and Oceaneering International, Inc. has resulted in the development of a Fly-By-Wire (FBW) system for ROV (Remotely Operated Vehicle) control in any water depth, allowing the vehicle to hold station indefinitely and navigate to real-world coordinates automatically.
A Sonardyne SPRINT system was installed on one of Oceaneering’s Maxximum ROVs and integrated with a Sonardyne Ranger 2 Ultra Short Baseline (USBL) system for acoustic aiding of the Inertial Navigation System (INS). The trials took place in the Gulf of Mexico in water depths of 3,057 metres (10,030 ft) and results showed that continuous hovering of the ROV in mid-water beyond Doppler Velocity Log (DVL) range was possible, as well as automatic navigation to waypoints.
The majority of ROV navigation systems utilize an Attitude and Heading Reference System (AHRS) and DVL to provide a relative or dead reckoned position. These systems are subject to time and distance based position errors and only operate close to the seabed, meaning mid-water operations are conducted via manual control so real world or relative coordinates cannot be easily used by the ROV pilot. To address these limitations, Sonardyne and Oceaneering have developed a novel navigation and control system solution utilising the dual output of INS and AHRS data from SPRINT to provide ROV Dynamic Positioning (DP) in all water depths with capabilities beyond current state-of-the-art, without affecting reliability or ease of use.
Read the full article at Subsea World News