N.Martins and S.M. Jesus nmartins@ualg.pt and sjesus@ualg.pt
SiPLAB-FCT, Universidade do Algarve
Faro, Portugal
C.Gervaise and A.Quinquis gervaise@ensieta.fr and quinquis@ensieta.fr
ENSIETA
Brest, France.
Comments: download pdf file .
Ref.: Proc. ICASSP 2002, (ISBN 0-7803-7403-7),
p.II-1225-1228, Orlando (USA), May 2002.
Abstract: Blind deconvolution is presented in the underwater acoustic channel context,
by time-frequency processing. The acoustic propagation environment was modelled as a multipath
propagation channel. For noiseless simulated data, source signature estimation was performed
by a model-based method. The channel estimate was obtained via a time-frequency formulation of
the conventional matched-filter. Simulations used a ray-tracing physical model, initiated with
at-sea recorded environmental data, in order to produce realistic underwater channel conditions.
The quality of the estimates was 0.793 for the source signal, and close to 1 for the resolved
amplitudes and time delays of the impulse response. Time-frequency processing was proved to overcome
the typical ill-conditioning of single sensor deterministic deconvolution techniques.
ACKNOWLEDGMENT: