Abstract
An inversion method for the estimation of geoacoustic properties of the ocean bottom using data from a small number of acoustic vector sensors was developed. The experimental data used for the inversions were short duration, gated continuous wave transmissions acquired on four acoustic vector sensors that spanned the water-sediment interface during the Sediment Acoustics Experiment 2004 (SAX04) conducted in the Gulf of Mexico. The acoustic signals were analyzed for their specific acoustic impedance over a bandwidth ranging from 600 to 2400 Hz. The specific acoustic impedance was obtained from simultaneous measurements of the acoustic pressure and particle acceleration for arrivals at normal incidence. A differential evolution algorithm was used for the inversion of the depth dependent sediment properties. A wave number integration routine was used to compute the specific acoustic impedance corresponding to the estimated sediment parameters. Experiment details, forward modeling, inversion methods, and results are discussed. [Work supported by ONR.]
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