A. Mantouka, amantouka@ualg.pt
P. Felisberto, pfelis@ualg.pt
S.M. Jesus sjesus@ualg.pt
P. Santos, pjsantos@ualg.pt
LARSys, University of Algarve,
Campus de Gambelas, PT-8005-139 Faro, Portugal.
and
L. Sebastião l.sebastiao@isr.ist.utl.pt
Institute for Systems and Robotics, Instituto Superior Técnico, Lisboa, Portugal.
Comments: download pdf file (not available).
Ref.: MTS/IEEE Oceans, Aberdeen, June 2017.
Abstract
This paper describes the application of a Dual Accelerometer Vector Sensor (DAVS) for the discrimination between
the bottom reflections, the source direct arrival and the source ghost or multipath in an unconventional seismic
acquisition scenario. The realisation of the DAVS device as well as the seismic experiment were carried out in
the scope of the WiMUST project, an EU project, supported under the Horizon 2020 Framework Programme. The WiMUST
project aims to improve the efficiency of the methodologies used to perform geophysical acoustic surveys at sea,
using Autonomous Underwater Vehicles (AUVs) equipped with optimum sensors. In a classical reflection seismic survey
scenario, the DAVS can contribute to this aim by steering its acoustic beam to the desired direction, therefore
reducing the amount of post processing related to deghosting and multipath removal. Moreover, in an unconventional
scenario, this steering capability offers the possibility of distinguishing between direct arrivals and multipath.
In this paper, using data acquired during a WiMUST experiment, the device’s directional estimation capabilities
are demonstrated using a conventional beamformer for the determination of the Direction of Arrival (DOA) of
seismic waves. The beamformer inputs are pressure and particle velocities in three directions. For the results
presented here the pressure was derived from the devices’ two accelerometers.
ACKNOWLEDGMENT: This work was funded under project WiMUST contract 645141, H2020 program of the EU.
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