Digital Processing of Explosive-Source Ocean-Bottom-Reflected Acoustic Signals.
Abstract
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 1/3-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 model's inadequacies, particularly the importance of attenuation in low-frequency bottom-reflection prediction, are discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 09, 1972
- Accession Number
- AD0748199
Entities
People
- Salvatore R. Santaniello
- Steven R. Van Der Veen
Organizations
- Naval Undersea Warfare Center