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Testing of the Dual Accelerometer Vector Sensor mounted on an Autonomous Underwater Vehicle

Underwater Acoustics Conference and Exhibit 2017, Skyathos (Grecce)

P. Santos pjsantos(at),
P. Felisberto pfelis(at),
F. Zabel fredz(at),
S.M. Jesus sjesus(at),
LarSys, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro (Portugal).
L. Sebastião l.sebastiao(at),
LarSys, IST, Universidade de Lisboa, 1005 Lisboa (Portugal).

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Ref.: in UACE'2017, Skyathos (Greece), September 2017.

The Dual Accelerometer Vector Sensor (DAVS) consists of two tri-axial accelerometers and one hydrophone aligned in a vertical axis molded in one unit. The DAVS was developed within the activities of the WiMUST European project, which aims to improve the efficacy of actual seismic surveys by the use of Autonomous Underwater Vehicles (AUVs) in a distributed configuration. Taking into account their spatial filtering capabilities, vector sensors allow to reduce the arrays length and energy consumption of the AUVs, increasing the maneuverability and facilitating the operation of the WiMUST distributed system. This paper presents the results of the functionality tests of the DAVS prototype conducted in a shallow pond (~3m deep), in “Parque das Nações”, Lisbon. The probe signals in the 1-2kHz band were emitted by a moored source deployed at 1.5m depth. The DAVS was mounted in front of a MEDUSA class AUV, which was sailing beneath the surface and was following a pre-programed path with a 0.26m/s nominal speed. Preliminary results show that the azimuth estimates are coherent with the MEDUSA trajectories even in curved paths where the thruster noise increases. Moreover, combinations of the pressure and particle velocity from DAVS outputs, show to improve the image of bottom reflection structure. [work supported by EU H2020 under project WiMUST ICT-645141].