On Variations of the Sound Signal Propagation Time under a Stationary Ice Cover

IF 0.9 4区物理与天体物理 Q4 ACOUSTICS

Acoustical Physics Pub Date : 2023-11-16 DOI:10.1134/S1063771023600626

V. G. Petnikov, A. V. Shatravin, A. A. Lunkov

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Abstract—In experiments on a stationary acoustic track under a solid ice cover, estimates of possible sound signal propagation time variations at distances of ∼4 km with a period of more than 100 s were obtained. The experiments were carried out on Lake Baikal in the spring period, when the vertical profile of the sound speed has two sections characteristic of freshwater areas: an upper layer with a near constant sound speed and a lower layer with linear growth of sound speed. Under these conditions, the variations of the propagation time did not exceed ~10^–4 s. Numerical modeling showed that the variations of propagation times due to the variability of the medium are minimal for the case when the sound source and receiver are located in the upper layer. It is demonstrated that in this case it is acceptable to take the sound speed in the upper quasi-homogeneous layer as the effective value of the sound speed, which determines the propagation time. The obtained results allowed us to formulate recommendations on under-ice acoustic positioning of autonomous underwater vehicles.

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静止冰盖下声信号传播时间的变化

在固体冰盖下的固定声轨迹实验中，获得了在~ 4 km距离上可能的声信号传播时间变化的估计，其周期超过100 s。在贝加尔湖春季进行的实验中，声速垂直剖面具有淡水区特征的两个剖面:上层声速接近恒定，下层声速线性增长。在这些条件下，繁殖时间的变化不超过~ 10-4 s。数值模拟结果表明，当声源和接收机位于上层时，由于介质的变化而引起的传播时间变化最小。结果表明，在这种情况下，将上层准均匀层的声速作为声速的有效值是可以接受的，声速决定了传播时间。所得结果为自主水下航行器的冰下声学定位提出了建议。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acoustical Physics 物理-声学

CiteScore

1.60

自引率

50.00%

发文量

审稿时长

3.5 months

期刊介绍： Acoustical Physics is an international peer reviewed journal published with the participation of the Russian Academy of Sciences. It covers theoretical and experimental aspects of basic and applied acoustics: classical problems of linear acoustics and wave theory; nonlinear acoustics; physical acoustics; ocean acoustics and hydroacoustics; atmospheric and aeroacoustics; acoustics of structurally inhomogeneous solids; geological acoustics; acoustical ecology, noise and vibration; chamber acoustics, musical acoustics; acoustic signals processing, computer simulations; acoustics of living systems, biomedical acoustics; physical principles of engineering acoustics. The journal publishes critical reviews, original articles, short communications, and letters to the editor. It covers theoretical and experimental aspects of basic and applied acoustics. The journal welcomes manuscripts from all countries in the English or Russian language.