The ULS-500 PRO was mounted to a Triton 1000/2 free-moving, battery-powered submarine along with Sonardyne’s acoustically aided inertial navigation system (AAINS), SPRINT, for positioning. The ULS-500 PRO was mounted perpendicular to the seabed, facing downwards in order to capture the port side, bow, and stern of the U-Boat in a single pass over a 65m baseline.
Survey of U-576
In adverse conditions, the Triton 1000/2 operated at a speed of 0.5 knots, which allowed for a single pass to be completed in 7 minutes. A complete 3D model of U-576 was able to be constructed from only 4 passes, however, multiple redundant runs were performed to ensure further accuracy. NOAA was able to achieve a total of two dives on the site. Each dive was composed of 8 passes at an altitude of approximately 7m.
The raw laser point cloud data and navigational data were recorded and processed through EIVA navigational software providing real-time display of data. The point clouds were filtered by intensity and as a result of being geo-referenced, a 3D model was developed without the use of stitching.