S.M. Jesus, C.Soares, A. Silva sjesus@ualg.pt , csoares@ualg.pt , asilva@ualg.pt
SiPLAB-FCT, Universidade do Algarve
Faro, Portugal
J.-P. Hermand jhermand@ulb.ac.be
EHL - Universite Libre de Bruxelles
Brussels, Belgium
E. Ferreira Coelho coelho@saclantc.nato.int
NATO Undersea Research Centre
La Spezia, Italy
Comments: download pdf
file .
Ref.: in 148th Meeting of the Acoustical Society of
America, Vol.116, No.4, Pt.2,
San
Diego, October 2004.
Abstract : The concept of an easy to use and easy to deploy
Ocean Acoustic Tomographic (OAT) system is presented. The system is
composed of a network of buoys and a data inversion online processor.
This study concerns the individual node of that network - the
Acoustic-Oceanographic Buoy (AOB) - the data inversion technique and
the testing of the system at sea. The AOB is a lightweight surface buoy
with a vertical array of acoustic and temperature sensors to be hand
deployed in a free drifting configuration from a small boat. The data
is locally stored and transmitted online to a remote station for
processing and monitoring. Data inversion is based on a broadband
matched-field tomography technique where known and unknown parameters
are simultaneously searched for (focalization). In-situ recorded temperature data
serve for algorithm initialization and calibration. The AOB was
successfully deployed in several consecutive days during two Rapid
Environmental Assessment sea trials in 2003 (Mediterranean) and 2004
(Atlantic). Data collected at sea also show that the AOB can be
reconfigured as a receiving array for underwater coherent
communications in the band up to 15 kHz.
ACKNOWLEDGMENT: this work was partially supported by FCT and Royal Netherlands Navy - projects NUACE, POSI/CPS/47824/2002 and REA, RNLNC/2003/04.