LAUV Harald

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.

TECHNICAL SPECIFICATIONS

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

COMMUNICATIONS

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

SENSORS

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