The effect of time-varying characteristics of shallow-sea waveguides on low-frequency acoustic signal transmission

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS Applied Acoustics Pub Date : 2024-11-15 DOI:10.1016/j.apacoust.2024.110375

Lidong Huang , Zhuoyang Zou , Bin Wu , Wenrui Wang , Lingyun Ye

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Abstract

The time-varying characteristic of shallow sea channel plays one of the most important role in the exploration of ocean. However, there is still lack of estimation model to describe the time-varying characteristics of shallow water low-frequency acoustic channels. This paper proposes a low-frequency channel model based on wave equation and ray theory to estimate the time-varying characteristics of shallow sea. Firstly, for the actual characteristics of shallow sea, suitable boundary conditions are designed to solve the wave equation. Secondly, the constraint conditions of shallow sea wave equation are optimized by combining ray theory. Then, based on the physical characteristics of shallow sea, time-delay variation and phase variation are solved by shallow wave equation. Combining bellhop propagation model with ocean disturbance model, the simulation is designed to verify the time-varying characteristic model of low-frequency shallow sea in this paper. Finally, with different propagation distance measurement experiment of sea, estimation value of time-delay variation and phase variation are confirmed, which is significant to shallow sea channel.

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浅海波导的时变特性对低频声学信号传输的影响

浅海声道的时变特性在海洋探测中起着最重要的作用之一。然而，目前仍缺乏描述浅海低频声道时变特性的估算模型。本文提出了一种基于波方程和射线理论的低频声道模型来估计浅海的时变特性。首先，针对浅海的实际特点，设计了合适的边界条件来求解波方程。其次，结合射线理论优化浅海波浪方程的约束条件。然后，根据浅海的物理特性，用浅海波方程求解时延变化和相位变化。结合钟楼传播模型和海洋扰动模型，设计仿真验证本文提出的低频浅海时变特性模型。最后，通过对不同传播距离海域的测量实验，证实了时延变化和相位变化的估计值，这对浅海航道具有重要意义。

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来源期刊

Applied Acoustics 物理-声学

CiteScore

7.40

自引率

11.80%

发文量

618

审稿时长

7.5 months

期刊介绍： Since its launch in 1968, Applied Acoustics has been publishing high quality research papers providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense. Applied Acoustics looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. The Journal aims to encourage the exchange of practical experience through publication and in so doing creates a fund of technological information that can be used for solving related problems. The presentation of information in graphical or tabular form is especially encouraged. If a report of a mathematical development is a necessary part of a paper it is important to ensure that it is there only as an integral part of a practical solution to a problem and is supported by data. Applied Acoustics encourages the exchange of practical experience in the following ways: • Complete Papers • Short Technical Notes • Review Articles; and thereby provides a wealth of technological information that can be used to solve related problems. Manuscripts that address all fields of applications of acoustics ranging from medicine and NDT to the environment and buildings are welcome.