基于子波变换的水下目标辐射噪声特征提取方法

将子波变换和多分辨分解算法，分别应用到水下目标辐射噪声的线谱和调制谱提取中。文中主要介绍了基于离散子波变换提取辐射噪声线谱的方法、基于多分辨分解算法提取辐射噪声调制谱的方法；在此基础上，以某型号水下航行器实测辐射噪声为例，进行了仿真研究，通过比较仿真结果与该水下航行器的相关数据，验证了该方法的正确性和可行性。

Characteristic Extraction Method for Underwater Target Radiated Noise Based on Wavelet Transform

Characteristic extraction is crucial to recognize underwater target. This paper introduces two methods for radiated noise line spectrum extraction based on discrete wavelet transform and for radiated noise modulation spectrum extraction based on multiresolution approximations arithmetic. Using the methods and real radiated noise data collected from underwater aircraft navigated in sea, after the simulational result and the real characteristic data on the underwater aircraft are compared, the feasibility and the correctness are verified. Using the methods, the efficient frequency information from collected radiated noise can be extracted and recognition precision of underwater target be increased.