X. Demoulin, L. Pelissero, Y.
CMO - SHOM, Brest, France
S.M. Jesus firstname.lastname@example.org
UCEH - Universidade do Algarve, Faro, Portugal
M.B. Porter email@example.com
SAIC, La Jolla, USA
E. Coelho firstname.lastname@example.org
Instituto Hidrografico, Lisboa, Portugal
Comments: download pdf file .
Ref.: Proc. ECUA 2000, (ISBN 92-828-9530-0), pp. 191-196, Lyon, France, June 2000.
Abstract : A simple and fast approach to retrieve equivalent
geoacoustic parameters is presented in this paper. The method is based
upon the processing of 300-800 Hz broadband signals on a single
hydrophone.Two stable characteristics of the impulse response of the
shallow water waveguide are estimated: the time dispersion and the
bottom reflection amplitudes. This two features are analytically linked
to the compressional speed and to the attenuation coefficient of the
medium. The inversion of the two latter geoacoustic parameters is
straightforward since it relies on an analytical expression. The method
is tested on INTIMATE96 data. The results show an excellent agreement
between the reflection of the true medium and the reflection
coefficient of the equivalent medium.
ACKNOWLEDGMENT: this work was partially supported by project ATOMS from FCT (Portugal).