Accession Number:

ADA027586

Title:

Evaluation of a Reverberation Model with Multiple Boundary Reflections.

Descriptive Note:

Master's thesis,

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB

Personal Author(s):

• Chin,Chih-Liang

Report Date:

1976-03-30

Pagination or Media Count:

88.0

Abstract:

A reverberation model was modified to allow the sea surface backscattering strength to vary with grazing angle, wind speed and frequency. The total reverberation predicted by the model was favorably compared with experimental data obtained in deep ocean water. A modification to incorporate grazing angle and bottom type into the basic model provided only a rough estimate of the reverberation generated by the sea bottom in shallow water. To investigate the possible effects of multiple propagation paths in shallow water, four additional reflection paths were investigated. As considered in the model, these paths did not contribute to the overall reverberation level calculated in shallow water. The sensitivity of the acoustic beam pattern on the reverberation level was also investigated. In the case of single backscattering the minor lobes of the pattern could be identified. This was not possible for multiple reflections.

Descriptors:

• *REVERBERATION
• *SONAR
• *UNDERWATER SOUND
• MATHEMATICAL MODELS
• NUMERICAL ANALYSIS
• THESES
• BACKSCATTERING
• SHALLOW WATER

Subject Categories:

• Acoustic Detection and Detectors
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE