Statistical Noise Distribution Modelling for Underwater Acoustic Signals Based on SαS
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摘要: 针对水声信号噪声统计分布难以准确描述的问题, 在α稳定分布相关特性基础上, 提出了一种基于对称α稳定分布(SαS)的水声信号噪声统计分布模型。首先结合水声信号噪声概率分布的特征, 建立了用于描述水声信号噪声统计分布的SαS模型, 再根据各种水声环境实际试验数据, 对不同水声环境下特征指数α的取值范围进行了水池、湖试和海试试验统计。试验数据分析结果表明, SαS分布模型可用于水声噪声信号统计描述。Abstract: To accurately describe statistical noise distribution of underwater acoustic signal, we established a statistical noise distribution model of the acoustic signal based on relevant features of symmetric α-stable( SαS) distribution. Firstly, the model configuration for describing noise characteristics of underwater acoustic signal with reverberation was designed by considering the features of noise probability distribution of acoustic signal. Then, the range of index α was determined by trials in tank, lake and sea, respectively, in different acoustic environments. The analysis of the test data shows that the proposed SαS distribution-based model is applicable.
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