水下目标辐射噪声中单频信号分量的检测：理论分析  

The detection of single frequency component of underwater radiated noise of target:theoretical analysis

作　　者：李启虎[1] 李敏[1] 杨秀庭[1] 

机构地区：[1]中国科学院声学研究所,北京100190

出　　处：《声学学报》2008年第3期193-196,共4页Acta Acustica

基　　金：国家自然科学资金(60532040)

摘　　要：在理想情况下高斯噪声背景下高斯信号的最佳检测问题已受到很多关注,它是被动声呐采用能量检测的理论基础之一。但是理论与实验都已证明,舰船辐射噪声中存在着单频信号分量。在小信噪比下,单频信号的检测必须采用有别于宽带能量检测的方法。本文讨论在小信噪比下检测单频信号分量的几种不同的理论方法,包括自相关检测、FFT分析、自适应线谱增强等,计算了它们的增益。指出分段FFT检测具有明显的优势,对可能出现的单频信号分量的频率漂移具有较好的宽容性。In the ideal assumption, the optimum detection problem of Gaussian signal in the background of Gaussian noise have attracted many research works, it is the one of theoretical basis of passive sonar detection. The theoretical analysis and experiment proved that there exist single frequency signal component in radiated noise of underwater target. In the situation of low signal to noise ratio, it is necessary to adopt new detection method, which is different with broadband energy detection. Several kinds of theoretical method for detecting single frequency component are described in this paper, including autocorrelation detection, FFT analysis, adaptive line enhancing etc. The system gain are derived. It is showed that the segment FFT detection has obvious advantage, it is more robust for the frequency shifting, which might have in signal propagation.

关 键 词：高斯信号 最佳检测 水下目标辐射噪声 单频 分量 FFT分析 舰船辐射噪声 能量检测 

分 类 号：O427[理学—声学]