Sensitivity of High Frequency Surface-Generated Noise to Sonar and Environmental Parameters.
NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CT NEW LONDON LAB
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This document investigates the sensitivity of high frequency 6 to 60 kHz surface-generated ambient noise to sonar and environmental parameters. A simulation model for the vertical directionality and depth dependence of noise originating at the ocean surface is developed. The use of model is demonstrated when sonar beam elevation angle, receiver depth, water depth, and sound speed profile are varied at a relatively high frequency 23.5 kHz. Results show a high level of sensitivity to these parameters. In deep water, it is predicted that volume absorption is the dominant contributor to the anisotropic character of the noise field. In shallow water, it is shown that the received noise levels are limited primarily by two environmental parameters of the ocean 1 sound speed profile and 2 bottom porosity. Author
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