GEODESEA-2019 An experiment of seafloor geodesy in the Bay of Brest
|Author(s)||Royer Jean-Yves1, Ballu Valérie2, Beauverger Mickael1, Coulombier Thibault2, Morvan Pierre-Yves3, Urvoas Paul3, Chupin Clémence2, Sakic Pierre4|
|Affiliation(s)||1 : Lab. Géosciences Océan, CNRS & Univ. de Brest, Plouzané, France
2 : Lab. Littoral Environnement et Sociétés, CNRS et Univ. La Rochelle, La Rochelle, France
3 : Acoustic Positioning Division, iXBlue, Brest, France
4 : GFZ German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam, Germany
|Keyword(s)||Seafloor Geodesy, Acoustic ranging, GNSS/Acoustics, Unmanned Surface Vehicle (USV)|
In the framework of the ERC FOCUS project, the Geosciences Ocean Laboratory (LGO) organized, from July 22 to 26, 2019, an experiment of seafloor geodesy in the Bay of Brest, entitled Geodesea-2019. The aim was to test acoustic beacons acquired for the FOCUS project and to test experimental protocols for seafloor positioning. The experiment was carried out from the Albert Lucas research station-vessel. The experiment was conducted in collaboration with the Laboratoire Environnement et Sociétés (LIENSs) from la Rochelle and the iXBlue company, in Brest.
Relative acoustic ranging was carried out during four days, each beacon ranging the other ones at a regular time interval, while acquiring auxiliary data (temperature, pressure, sound-speed) to be able to convert travel-times into distances. Absolute positioning of the beacons on the seafloor was also carried out using a small Unmanned Surface Vehicle (USV) on which a compact GNSS/Acoustic system was mounted, combining an Ultra Short Baseline (USBL), an inertial system (INS) and a GNSS receiver.
|Acknowledgments||We wish to thank all participants for the success of the Geodesea-2019 experiment: - LGO: Jean-Yves Royer (PI), Mickael Beauverger, Charles Poitou, Marc-André Gutscher - LIENSs: Valérie Ballu, Thibault Coulombier, Clémence Chupin - IXblue: Paul Urvoas, Pierre-Yves Morvan, Yoann Caudal, Corinne Le Guicher - SV Albert Lucas: Frank Quéré, Robin Carlier - The Canopus beacons and the Geodesea-2019 experiment were funded by the ERC FOCUS, the LGO, the LIENSs and the French Oceanographic Fleet, with support from the IXblue company for the preparation of the beacons and the implementation of their equipment.|