Inversion for bottom parameters using low frequency reverberation data
conference paper
Active sonar reverberation returns offer the possibility to invert for geo-acoustic bottom parameters to characterise the underwater environment. We present the results of synthetic inversions of reverberation returs generated with a ray-based reverberation model in which bottom scattering is modelled according to a modified Lambert's rule. The inverted parameters are sediment sound speed, attenuation and the scattering strength, parametrised by Lambert's constant and a low grazing angle threshold. The sediment density is calculated during the inversions through an empirical relationship to sediment sound speed. Results of inversions of synthetic data using a genetic algorithm are presented both for a soft muddy bottom and a harder and rougher bottom consisting of coarse sand. We also investigate the effect of an error in water depth.
Topics
TNO Identifier
95511
ISBN
83-907-5918-7
Publisher
Gdansk Univ. of Technology
Source title
Proceedings of the 6th European conference on underwater acoustics, ECUA 2002, 24-27 June 2002, Gdansk, Poland
Place of publication
Gdansk
Pages
147-152
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