DAGON


DAGON
AUV-Dagon deployed in the Uni-lake (Source: Bilal Wehbe, DFKI GmbH)
This system is also used for teaching

Technical Details

Size: 110 x 80 x 40 cm
Weight: 75 kg
Power supply: Lilo-Battery, 1.6 kWh@29,7V
Actuation/ Engine:
6 Thrusters (150W)
Sensors:
Digital pressure sensor, 600kHz DVL, KVH FOG, XSens IMU
Communication:
Low-Bandwith- underwater modem, Fibreoptic cable
Camera System:
digital stereo camera system with Full-HD-Resolution (1920x1080@30FPS)
Localization sensors:
Desert Star Systems LBL, Evologics USBL
Max. Operating Depth:
150 m

Organisational Details

Application Field: Underwater Robotics
Related Projects: EurEx-SiLaNa
EurEx-Safe Long-Term Navigation (09.2017- 12.2018)
Mare-IT
Information Technology for Maritime Applications (08.2018- 07.2021)
CUSLAM
Localization and mapping in confined underwater environments (09.2009- 07.2012)
EurEx
Europa-Explorer (12.2012- 04.2016)
Eurofleets2
Towards an Alliance of European Research fleets and maritime Equipment (04.2013- 06.2017)
FlatFish
Autonomous underwater vehicle (11.2013- 06.2017)
MerdROV
Evaluation of navigation-concepts for UUVs in fish-farms (01.2012- 12.2013)
ROBEX
Robotic Exploration of Extreme Environments (10.2012- 09.2017)
Robocademy
ITN Robocademy (01.2014- 12.2017)
ScienceROV
Limitations and possibilities for ROV use in industrial scale Aquaculture research experiments (04.2013- 08.2013)
Related Software: Rock
Robot Construction Kit
This system is used for teaching students.

System description

CAD-drawing of the complete vehicle (Source: DFKI GmbH)
Example for a map and trajectory made on synthetic data (Source: DFKI GmbH)
Source: DFKI GmbH
Dagon at the Maritime Exploration Hall (Source: Bilal Wehbe, DFKI GmbH)

The Dagon AUV was designed and build for the CUSLAM project. The vehicle is specifically designed as a scientific AUV for visual mapping and localization,  incorporating high-end instrumentation and sensors to allow research in this area with the best technology can offer today.

The main goals in the design were to provide a platform for conducting experiments in the area of visual mapping and localization. Its high quality stereo camera system acts as the main sensor system for this application and is supplemented by the internal IMU and pressure sensors. Using visual odometry and SLAM approaches a map of the seafloor and the vehicles trajectory over the seafloor is generated.

In order to validate the measurements made by this visual approach to mapping and localization, the complete additional navigation instrumentation available (LBL, DVL, FOG) allows a second independent measurement to be recorded using widely used an proven algorithms. This second measurement can then be used as a ground-truth for judging the quality of the visually generated data.

Dagon is a hovering AUV - it does not rely on forward movement to keep its current depth. This makes actuation more complex, but enables unique maneuverability in a wide range of environments. Dagon's six thrusters give it five degrees of freedom - only the roll axis cannot be actively controlled. This last axis is kept passively stable by the catamaran shape of the vehicle. The stereo camera system is mounted in the two heads of the AUV, which offer a 180° range of tilt. Together with the hovering capability this enables not only seafloor mapping, but ship-hull inspection or even under-ice mapping / localization.

The camera system is capable of recording four hours of uncompressed HD (1920x1080) video at 30 FPS - from both cameras simultaneously. Combining  extremely sensitive CCDs in the cameras with large-aperture (F=1.4) wide-angle (64° in water) lenses creates precise and feature-rich underwater imagery.

The AUV has a nominal operating time of six hours, which may vary with the type of mission. It can either be used as a completely autonomous vehicle, with the only communication available being the low-bandwidth acoustic modem, or together with a fiberoptic cable for telemetry. Using this cable a hybrid-ROV-mode is also possible, where control is done by a human operator or a control station on shore.

Videos

DAGON: Unter dem Eis

Das AUV Dagon im Unisee unter einer Eisdecke.

DAGON: Pipeline Inspektion

Dagon bei der Inspektion von Kühlwasserleitungen (Durchmesser: 3,5m) am neuen Kohlekraftwerk in Wilhelmshaven.

DAGON: Im Unterwasserlabor

Experimente zur Beweglichkeit und Steuerung im Glasbecken des DFKI mit dem voll-integrierten AUV Dagon.

DAGON: Im Unisee

AUV-Dagon trainiert in einem Binnengewässer bei trüber Sicht.

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© DFKI GmbH
last updated 06.12.2019
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