Digital Processing of Explosive-Source Ocean-Bottom-Reflected Acoustic Signals.
NAVAL UNDERWATER SYSTEMS CENTER NEWPORT R I
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Low-frequency 100-Hz to 800-Hz measurements of bottom-reflection losses in the North Pacific Ocean are discussed with respect to processing and modeling techniques. The data were acquired using shallow-depth 500-foot explosive sound sources and a deep-depth 11,000-foot hydrophone and were first processed on a total energy basis in 13-octave bands. An inverse filtering technique deconvolution for improving the ability to resolve sub-bottom reflections was successfully implemented and is also described. A multi-layered, absorbing, ocean bottom model was constructed and gave fair to good prediction of bottom loss. The structure of the model was determined mainly by acoustic methods where the composition was estimated from geological descriptions for the area. The models inadequacies, particularly the importance of attenuation in low-frequency bottom-reflection prediction, are discussed. Author
- Physical and Dynamic Oceanography