LAUV Harald description
When it comes to characterization of the physical and biological properties of the water column, LAUV Harald is our vehicle of choice. Equipped with a variety of physical and environmental sensors, this LAUV provides valuable information to oceanographers, biologists and other fields interested in the physical and chemical properties of the water column.
In a similar fashion as LAUV Fridtjof, LAU Harald can be controlled with a mobile-based app. Planning of the missions is done on DUNE. Real time information is transmitted through a wireless ethernet network when on the surface through the Manta modem. Underwater the Manta communicates through an Evologics USBL communication system.
Due to its intended purpose, this vehicle is often flying without a bottom-track. This impacts the accuracy of its navigation precision. But for many oceanographic surveys, specially to study phenomena with physical scales over kilometers, accurate localization is not that big of an issue, for example, using the vehicle to identify water fronts.
Heavier than LAUV Fridtjof, it is considerable to have two people available to deploy this vehicle. The user should also bear in mind that this vehicle is not equipped with obstacle detection. Consider running a compass calibration and trimming the vehicles buoyancy before the first dive in a set.
Vehicle length: 240cm
Weight in air: 32.1 kg
Max operational depth 100m
Speed, 0.5 to 2 m/s
Typical endurance 24h @1kn, depending on diving profile and payload
Data storage 16GB
Battery: 8x 173.6Wh Li-ion
WLAN up to 1 km with the Manta modem
GSM within 3G coverage
Evologics S2CR 18/34 USBL underwater acoustic modem for a link up to 1km, depending on water conditions.
Iridium SBD module
Emergency acoustic pinger and directional hydrophone with up to 2km range
Attitude and heading reference system (AHRS) aided by DVL.
External USB pen drive
Main CPU: AMD Geode LX 800 CPU
IMU: Microstrain 3DM-GX4-25
CTD: SeaBird SBE 49 FastCAT
Dissolved Oxygen: Aanderaa Optode 4831F
Fluorometer: WetLabs EcoPuck Triplet
|Oceanography: water column salinity and temperature characterization||marine environmental profiling|
|Marine ecology: oxygen and chlorophyl distribution||Sound speed measurement|