Time-saving Dynamic Underwater Mapping Solution

Time-saving Dynamic Underwater Mapping Solution

Two subsea technology companies, 2G Robotics and Sonardyne International, have entered into a formal collaboration agreement. The two organisations are working together on the development and promotion of a dynamic underwater laser mapping solution which significantly reduces the time needed to survey seafloor sites and offshore structures.

The agreement centres on the integration of Sonardyne’s acoustically aided inertial navigation system for underwater vehicles, SPRINT-Mapper, with 2G Robotics’ ULS-500 PRO dynamic underwater laser scanner. Projects conducted over the past six months have shown that combining the high resolution afforded by the 2G Robotics’ laser scanner combined with practical positioning accuracy produces a complete solution for fast and efficient dynamic laser scanning projects. These include archaeological surveys, pipeline and free span inspections, structural integrity monitoring and one of the most demanding of all survey tasks, pipeline metrology.

Centimetric Level of Accuracy

Until now, attempts at mapping from dynamic platforms have largely involved multi-beam imaging sonars being fitted to ROVs, AUVs and manned submersibles equipped with inertial, Doppler, acoustic positioning and depth instrumentation. As a result of their mobility, large areas can be quickly surveyed but this approach typically only achieves up to 10cm relative accuracy - effectively ruling out applications like metrology which require centimetre or better accuracy.

The new technique uses the 2G Robotics ULS-500 PRO laser scanner fitted to an underwater vehicle to capture high density point clouds of subsea assets and environments. As the vehicle moves around the site, the SPRINT-Mapper hardware, also fitted to the vehicle, simultaneously collects raw acoustic and inertial navigation data. On completion of the survey, the raw navigational data is post-processed and merged with the laser data to produce a georeferenced 3D point cloud from which centimetric level or better engineering measurements can be taken.

Flexible Deployment Location

By adopting a dynamic platform such as an ROV navigated using SPRINT-Mapper, the high-resolution laser data is no longer constrained by a stationary deployment location: an entire site can now be surveyed quickly and with the flexibility to overcome adverse conditions such as visibility. As the underwater vehicle does not have to come into contact with the seabed at the survey site, it can move to scan any target of interest from a variety of perspectives.

This new partnership represents an important development for the customer seeking to employ this survey technology. Through the agreement, both 2G Robotics and Sonardyne, as well as their distributors, can now offer a complete package for dynamic scanning - effectively eliminating any integration challenges faced by the end customer.

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