|Funding Reference||FCT - POCTI/CTA/47719/2002|
This research project aims at the development and validation of acoustic remote sensing systems and inversion methods for the reliable, rapid environmental assessment (REA) of shallow water areas. One of the most promising REA concepts is to use a field of sonobuoys, deployed either from the air or from surface ship, to receive signals from a controlled sound source or sources of opportunity. The acoustic data, radio telemetered to the aircraft or ship, are processed to determine the range-dependent, water-column and bottom acoustic properties over the area spanned by the drifting buoys. The resulting environmental parameters integrated with concurrent oceanographic measurements are then used to initialize and calibrate oceanographic prediction models for nowcast and forecast environmental hazards in potential areas. The proposed research work directly stems from previous efforts carried at University the Bruxelles and at SACLANT Undersea Research Center for geoacoustic inversion techniques with random fields of sonobouys and at University of Algarve, in the context of experimental testing of ocean acoustic tomography with sources of opportunity. In particular, proved concepts under static conditions, such as the use of a broadband coded signal propagated between a single sound source and a single hydrophone or a fixed array of hydrophones, will be extended to the dynamic configuration of freely drifting sonobuoys.
1. Data-oriented segmentation and inversion algorithms for range-dependent, geoacoustic mapping and seabed characterization;
Signal and Image Processing Group (SIPG)
Environmental Assessment with a Random Array of Acoustic Receivers