Doppler velocity log ROV attachment for stabilization and autonomy
Mounted to the bottom of the REVOLUTION ROV, the Waterlinked DVL provides not only calculates the ROV's altitude (depth from bottom) but it also receives realtime data of estimated speed and heading.
Combined with Deep Trekker BRIDGE sensor technology, the DVL provides more accurate and precise positioning and station holding - even in current.
DVL for search and recovery missions
During a search and recovery mission, the DVL will help maintain an optimal altitude for the imaging sonar, such as 15m above with the sonar on a 15 degree angle downward.
Position/Station holding with DVL
A DVL also is used to help hold position, say when performing an inspection and wanting to hold against current, or when using a manipulator or laser scanner where it is easier to be dead steady.
Automatic altitude hold
Use a DVL on the ROV to help stay on course in current, maintain an altitude above the sea floor. This is important for benthic surveys to get a clear picture without crashing into the bottom and stirring up sediment, making the survey more difficult.
Waterlinked DVL Mechanical
|Device diameter||66 mm|
|Device height||25 mm|
|Device weight (air)||250 grams|
|Device weight (submerged)||185 grams|
|Depth rating||1000 meters|
|Materials||Stainless steel 316 (housing), PEEK (transducer caps)|
|Operating temperature||-5 to 60 °C|
Waterlinked DVL Acoustics
|Transducer frequency||1 MHz|
|Transducer setup||4-beam convex Janus array|
|Transducer beam angle||22.5 degrees|
|Ping rate||4-26 Hz (adaptive to altitude)|
|Sensor assist||Integrated AHRS/IMU (Yost Labs TSS-NANO)|
|Min altitude||5 cm|
|Max altitude||50 meters (Performance at altitudes > 35 meter is dependent on seabed conditions, salinity levels etc.)|
|Max velocity||2.6 m/s|
|Velocity resolution||0.1 mm/s|
|Long term accuracy||±1.01 % (Standard version) ±0.1 % (Performance version)|