船舶航行辐射噪声信号仿真方法研究

船舶航行辐射噪声是被动声纳探测、声纳目标识别、听音判型等工作的重要信息源，其信号仿真是解决上述研究工作中噪声样本类型少或数量不足的有效方法，前提是所仿真信号必须满足逼真度要求。提出了一种基于实测信号重构的船舶航行辐射噪声信号仿真方法。通过谱估计提取信号的连续谱、线谱、调制谱特征，根据谱估计数据合成满足信号谱特征要求的船舶航行辐射噪声，并通过听觉感受调整调制谱参数。仿真结果显示所合成船舶航行辐射噪声信号能够从谱估计和听觉感受两方面逼近实测辐射噪声信号。 

On the Simulation of Vessel Navigation Noises

Vessel navigation noise is important signal source for passive sonar detection, target identification and artificial target classification. When fidelity requirements are satisfied, the simulated signals can be used as real samples which always fall short in both category and number. In this paper, an approach is proposed to reconstruct signals from measured ship radiated noise. Firstly, continuous spectrum, line spectrum and modulation spectrum are extracted from the measured noise by spectrum estimation. Secondly, simulated noise having similar spectrum features as the measured noise is synthesized by signal processing. Finally, the modulation parameters are adjusted according to the audition until the simulated noise satisfies the fidelity requirements in both spectrums and audition. The simulated vessel navigation noise maintains well the continuous spectrum’s peak position and spectral distribution of the measured ship radiated noise. Its modulation spectrum and audition feature also approximate to those of the measured propeller’s modulation signals. Simulation results show the effectiveness of the approach.