2019_programme: A NEW ACOUSTIC PAYLOAD FOR GLIDERS

• Session: 22. Vector Hydrophone Research
  Organiser(s): Yang Desen
• Lecture: A NEW ACOUSTIC PAYLOAD FOR GLIDERS
  Paper ID: 776
  Author(s): Uzan Lionel, Pellet Fabien
  Presenter: LePage Yann
  Presentation type: oral
  Abstract: In order to optimise the integration with the Seaexplorer glider, a new acoustic payload was developed to intend new possibilities. Indeed, the main asset of a glider is the endurance, so a special effort was done on the very low power electronic boards to maintain this point with a consumption of 1.7 W. Moreover, to ensure a very good signal quality, the EMC point has also been taking into account.\nThe system can deal with 8 hydrophones and this is a real breakthrough compared to the equivalent system on the market: the antenna gain (according to the mechanical design) can increase the detection range.\nThe main specifications of the system are:\n- sampling frequency up to 192 kHz\n- storage on 2 TB of memory\n- bandwidth: 10 Hz to 85 kHz\n- ADC : 24 bits\n- extra sensors input (CTD, SVP…)\n- Some embedded application:\no audio recording\no environmental noise level measurement at normalized frequencies (for example 63 and 125 Hz) on 1 hydrophone\no detect an acoustic anomaly\no localize by giving a direction\no classify\no modify the mission following detection and measurement\nSome improvements and evolutions are planned for the next year:\n- on the mechanical part, new design of the antenna could be considered (for example: 8 hydrophones line array)\n- on the electronic part, a more important effort on the power consumption reduction will be done to reach 1.5 W\n- on the software part, the classification process will be done on signature definition and it will be possible to define its own and feed the system with.\nSome results at sea will be presented.
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• Corresponding author: Mr Uzan Lionel
  Affiliation: ALSEAMAR
  Country: France
  e-mail: