Accession Number : AD0748199

Title :   Digital Processing of Explosive-Source Ocean-Bottom-Reflected Acoustic Signals.

Descriptive Note : Research rept.,

Corporate Author : NAVAL UNDERWATER SYSTEMS CENTER NEWPORT R I

Personal Author(s) : Santaniello,Salvatore R. ; van der Veen,Steven R.

Report Date : 09 AUG 1972

Pagination or Media Count : 39

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)

Descriptors :   (*UNDERWATER SOUND, REFLECTION), (*OCEAN BOTTOM SAMPLING, ACOUSTIC DETECTORS), UNDERWATER EXPLOSIONS, OCEAN BOTTOM, REFLECTIVITY, FOURIER ANALYSIS, INTEGRAL TRANSFORMS, PACIFIC OCEAN

Subject Categories : Physical and Dynamic Oceanography
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE