浅海环境噪声时间平稳性与起伏特性实测分析

发布时间：2018-04-16 08:35

本文选题：时间平稳性 + 起伏特性　；参考：《中国海洋大学学报(自然科学版)》2017年08期

【摘要】：海洋环境噪声具有时域非平稳和幅度起伏的特性。对于浅海海洋环境噪声的时间平稳性与起伏特性的研究,能够揭示浅海海洋环境噪声在时间尺度上的特性,为岸基与浅海声呐的设计、使用以及近岸安保提供技术支持。本文对实测的浅海海洋环境噪声进行时间平稳性与起伏特性分析,通过计算瞬时功率谱起伏率的概率分布,选取适当判别门限来确定环境噪声的平稳时间,得到浅海环境噪声平稳时间在3~5min内,并且不同频率的平稳时间不同;浅海环境噪声低频段与高频段在不同时间尺度上的起伏特性不同。本文还讨论了海况、季节和实验地点对浅海环境噪声平稳性的影响,分析表明噪声源的变化是引起浅海环境噪声场平稳性变化的主要原因。
[Abstract]:Marine environmental noise has the characteristics of non-stationary and amplitude fluctuation in time domain.The study on the temporal smoothness and fluctuation of the noise in the shallow sea environment can reveal the characteristics of the noise in the shallow sea on a time scale and provide technical support for the design, use and security of shore-based and shallow-sea sonar.In this paper, the time-stationary and fluctuating characteristics of the measured environmental noise in shallow sea are analyzed. By calculating the probability distribution of the instantaneous power spectrum fluctuation rate, the appropriate discriminant threshold is selected to determine the stationary time of the environmental noise.The results show that the stationary time of environmental noise in shallow water is within 3~5min and the stationary time of different frequency is different, and the fluctuation characteristics of low frequency and high frequency of environmental noise in shallow water are different on different time scales.The effects of sea conditions, seasons and experimental sites on the noise stationarity of shallow sea environment are also discussed. The analysis shows that the variation of noise source is the main reason for the stationary change of noise field in shallow sea environment.
【作者单位】：中国科学院声学研究所北海研究站;中国科学院大学;中国科学院水声环境特性重点实验室;
【基金】：国家自然科学基金项目(11174314;11474301;11204345)资助~~
【分类号】：P733.22

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