S.M. Jesus and C.Soares sjesus@ualg.pt
and csoares@ualg.pt
SiPLAB-FCT, Universidade do Algarve
Faro, Portugal
J. Onofre oceanografia@hidrografico.pt
Instituto Hidrografico
Lisboa, Portugal
P. Picco picco@estosf.santateresa.enea.it
ENEA, Santa Teresa
Italia
Comments: download pdf file .
Ref.: Proc. ECUA 2002, (ISBN 83-907591-8-7), p.9-18,
Gdansk (Poland), June 2002.
Abstract : Blind Ocean Acoustic Tomography (BOAT) is an ocean remote
exploration concept similar to acoustic tomography but where both the emitted
signal waveform and the source position are unknown. BOAT consists of a
minimal environmental model of the area, a broadband matched-field processor
and a genetic algorithm search procedure. This paper presents the results
obtained with BOAT on part of the data set acquired during the INTIFANTE'00
sea trial, where an acoustic source was towed along both range independent
and range dependent paths, with source-receiver ranges varying from 500 m
up to 5.5 km and water depths varying from 70 to 120 m. The results obtained
on several hours of data, show that source range and depth can be used as
focalizing parameters, together with the Bartlett power to indicate
model fitness. Using this three parameters it becomes clear when the
environment is ``in focus'' and when it is ``out of focus'' leading to
realiable estimates of the geometric and environmental parameters under estimation.
ACKNOWLEDGMENT: this work was partially supported by projects INTIMATE, ATOMS and TOMPACO from CNR, Italy.