摘要
船舶辐射噪声信号重构的逼真度是声诱饵的重要性能。由于传统船舶辐射噪声包络谱提取方法得到的调制谱存在频域的不均匀性,从而导致各频段的调制度存在差异,因此如何才能得到特征最显著的包络谱是个困难的问题。为了解决上述问题,首先通过对实测噪声进行谱估计提取信号的连续谱和包络谱特征,并结合传统的经验模型得到线谱分量,进而合成满足船舶辐射噪声特征的模拟噪声。其中包络谱特征的提取是将舰船噪声的多子带检波信号看作是对最优包络的一次观测,并作为循环相关,从而得到多子带融合包络谱。仿真结果表明优化仿真方法重构的船舶辐射噪声比传统模拟生成方法具有更高的相似度,证明了优化方法的有效性。
An optimization method for signal similarity reconstruction of ship noise is proposed. Firstly, the spec- trum estimation for the tested noise is carried out to extract feature of continuous spectrum and envelope spectrum, and component of line spectrum integrated with traditional empirical model is obtained, then analog noise meeting feature of ship radiation noise is compounded. The feature of envelope is extracted via regarding multiple sub - band detec- tion signal of the ship noise as an observation of optimal envelope and used as circular correlation to obtain envelope spectrum of multiple sub - band fusion. Simulation results show that the proposed method has higher similarity than traditional method. The results prove validity of the optimization method.
出处
《计算机仿真》
北大核心
2017年第8期260-264,共5页
Computer Simulation
基金
国家自然科学基金(11574120)
江苏省研究生创新项目(KYZZ16-0203)资助
关键词
船舶辐射噪声
包络谱
信号重构
Ship radiation noise
Envelope spectrum
Signal reconstruction
作者简介
田文（1992-），男（汉族），江苏泰州人，硕士研究生，研究方向：水声对抗。
王彪（1980-），男（汉族），甘肃张掖人，博士，副教授，研究方向：水声信号处理。
