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Estimating bottom properties with a vector sensor array during MakaiEx 2005
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Resumo(s)
Nowadays, vector sensors which measure both
acoustic pressure and particle velocity begin to be available in
underwater acoustic systems, normally configured as vector
sensor arrays (VSA). The spatial filtering capabilities of a VSA
can be used, with advantage over traditional pressure only
hydrophone arrays, for estimating acoustic field directionality as
well as arrival times and spectral content, which could open up
the possibility for its use in bottom properties' estimation. An
additional motivation for this work is to test the possibility of
using high frequency probe signals (say above 2 kHz) for
reducing size and cost of actual sub bottom profilers and current
geoacoustic inversion methods. This work studies the bottom
related structure of the VSA acquired signals, regarding the
emitted signal waveform, frequency band and source-receiver
geometry in order to estimate bottom properties, specially bottom
reflection coefficient characteristics. Such a system was used
during the Makai 2005 experiment, off Kauai I., Hawai (USA) to
receive precoded signals in a broad frequency band from 8 up to
14 kHz. The agreement between the observed and the modelled
acoustic data is discussed and preliminary results on the bottom
reflection estimation are presented.
Descrição
Palavras-chave
Processamento de sinais Sensores 621.38 Vector sensor High frequency inversion Geoacoustic properties Reflection loss
Contexto Educativo
Citação
2nd International Workshop on Marine Technology MARTECH 2007. - Vilanova I La Geltrú - Barcelona, 15-16 Novmber 2007. - 4 p
Editora
Vilanova I La Geltrú - Barcelona