一种估计水中目标辐射噪声线谱的方法

线谱是水中目标辐射噪声中重要的特征信息,在被动声呐系统中,线谱提取是水中目标识别的关键技术.文章简述了水中目标辐射噪声的物理成因和频谱特征,利用经典谱估计法与现代谱估计法在短时序列谱估计中的特点,结合仿真试验的结果,提出了一种对水中目标辐射噪声低频段线谱估计的联合分析法,并用该方法对2艘实船噪声进行了谱分析.实验结果表明,该方法对低频段的线谱特征提取有较好的实用效果.

A method for estimating line spectrum of radiated noise from underwater target

Line spectrum provide significant distinct information in radiation noise of underwater target. Extracting line spectrum from ship-radiated noise is a key technique for identification of underwater targets in passive sonar system. In this paper the physical and spectral characteristics of ship-radiated noise are first briefly introduced. Based on simulation of line spectrum estimation, a united method is provided to estimate the spectral lines in underwater target-radiated noise using the periodographic method and modern spectrum estimation method. The ship-radiated noise signals from two ships are analyzed by using the proposed method. The results show that the described method is effective in extracting spectral lines from underwater target-radiated noise.