DTIC ADA542072: Geoacoustic Inversion Using the Vector pdf

DTIC ADA542072: Geoacoustic Inversion Using the Vector

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This research is being conducted under the Ocean Acoustics Graduate Traineeship / Special Research Award program. The first year of this award was FY10. The goal of this research is the study of new geoacoustic inverse methods using the information in the acoustic vector field. The fundamental question addressed by this effort is whether knowledge of the vector field can improve estimates for seabed properties as quantified by their a posteriori probability distributions and resolutions relative to approaches based solely on the scalar field. OBJECTIVES The overall objective of this work is to pose new geoacoustic inverse problems utilizing the acoustic vector field and to study their performance. Specific research questions include the following: * What opportunity does knowledge of the acoustic vector field provide for the estimation of sediment geoacoustic properties via numerical inversion? * How does inversion performance vary when different acoustic parameters such as impedance and intensity are used to support the estimates?

* Does knowledge of the vector field improve the convergence rate relative to methods based solely on the acoustic scalar field? * Does knowledge of the vector field result in a different or improved estimate for the sediment properties? Does knowledge of the vector field reduce the solution variance

• Creator/s: Defense Technical Information Center
• Date: 9/30/2010
• Year: 2010
• Book Topics/Themes: DTIC Archive, , NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI DEPT OF SENSORS AND SONAR SYSTEMS, *UNDERWATER ACOUSTICS, *PROBABILITY DISTRIBUTION FUNCTIONS, *GEOACOUSTICS, *VECTOR ANALYSIS, *SEDIMENTS, SCALAR FUNCTIONS, OCEAN BOTTOM, ACOUSTIC FIELDS, BLOCK ISLAND, BLOCK ISLAND SOUND, GENETIC ALGORITHMS, SUSPENDED SEDIMENTS, TRANSFORMATIONS(MATHEMATICS), NUMERICAL ANALYSIS, OCEAN SURFACE, INVERSION

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