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IEEE Journal of Oceanic Engineering July 2003 1 Abstract--The inversion of broadband low frequency acoustic
 

Summary: IEEE Journal of Oceanic Engineering ­ July 2003 1
Abstract--The inversion of broadband low frequency acoustic
signals received on sparse arrays is known to lead to robust and
efficient estimations of seabed properties. This paper describes a
shallow water inversion scheme based on the use of a model based
matched impulse response on a single hydrophone. Results from
INTIMATE'96 experiment on the Portuguese shelf break are
reviewed. As strong internal tides affected the acoustic
transmissions, and in order to minimize the effects of this strong
time variability, we only exploit time-stable waterborne bottom-
surface reflected arrivals. A quasi-linear inversion algorithm,
which aims to refine the geometry of the experiment is developed.
Inversion of bottom parameters is performed with an objective
function which only makes use of the bottom-surface reflected
arrivals' amplitudes. The experimental results show that
broadband transmissions (300-800 Hz) received on a single
hydrophone, combined with the use of a simple eigenray code are
sufficient to correctly resolve geometrical parameters and bottom
features. The analysis of the reflection coefficients, both on
simulated and real data, helps to understand the validity of the

  

Source: Asch, Mark - Faculté de Mathématiques et d' Informatique, Université de Picardie Jules Verne

 

Collections: Mathematics; Computer Technologies and Information Sciences