Archives of Acoustics, 49, 2, pp. 221–231, 2024
10.24425/aoa.2024.148780

Analysis of Bottom Reverberation Intensity Under Beam-Controlled Emission Conditions in Deep Water

Guangying ZHENG
1) Science and Technology on Sonar Laboratory 2) Hangzhou Applied Acoustics Research Institute 3) Hanjiang National Laboratory
China

Xiaowei GUO
1) Science and Technology on Sonar Laboratory 2) Hangzhou Applied Acoustics Research Institute 3) Hanjiang National Laboratory
China

Fangwei ZHU
1) Science and Technology on Sonar Laboratory 2) Hangzhou Applied Acoustics Research Institute 3) Hanjiang National Laboratory
China

Fangyong WANG
1) Science and Technology on Sonar Laboratory 2) Hangzhou Applied Acoustics Research Institute 3) Hanjiang National Laboratory
China

Linlang BAI
1) Science and Technology on Sonar Laboratory 2) Hangzhou Applied Acoustics Research Institute 3) Hanjiang National Laboratory
China

A comprehensive understanding of the characteristics and the formation mechanism of reverberation is the key to improving the performance of the active target detection. In response to the challenge of analyzing the intensity of bottom reverberation in typical deep-sea environments, this study proposes a prediction method for the bottom reverberation intensity under beam-controlled emission conditions. It explains the variation law of bottom reverberation intensity under beam-controlled emission conditions in typical deep-sea environments of the South China Sea through theoretical and simulation analyses. Reverberation intensity of the deep-sea bottom under beam-controlled emission conditions exhibits significant fluctuations during the duration of reverberations in the direct sound zone of the seabed. This phenomenon is closely related to the directionality of the source emission, leading to intermittent reverberation masking and detectable areas in the active sonar detection. In addition, the duration of the high-reverberation zone near the cutoff distance of the direct sound from the seabed is longer under the beam-controlled emission conditions of the emission array located within the surface waveguide layer of the deep sea during winter.
Keywords: bottom reverberation; deep water; beam controlled emission; ray theory
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Copyright © 2024 The Author(s). This work is licensed under the Creative Commons Attribution 4.0 International CC BY 4.0.

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DOI: 10.24425/aoa.2024.148780