船舶辐射噪声信号相似度评估方法研究

On Similarity Evaluation Methods of Ship Radiated Noise Signals

船舶辐射噪声的信号相似度评估结果,可为噪声信号来源判定、仿真信号置信度评价等应用提供一种判断依据。提出一种船舶辐射噪声的信号相似度评估方法,综合了船舶辐射噪声信号的听觉、连续谱、线谱和调制谱特征,针对每一特征选择了具体指标参数和特征相似度的计算方法,然后在各特征相似度基础上实现船舶辐射噪声信号之间总体相似度的计算。利用实测船舶辐射噪声信号进行了数据试验,并给出了详细的评估和数据分析过程。试验结果表明,采用该方法得出的相似度评估数据,与船舶辐射噪声信号的实际相似情况一致,且数值区间的可分性好,因而具有较高的可信度。

Similarity evaluation results of ship radiated noise signals could be one of evidences for the applications such as source recognition of measured noises and the confidence computation of simulated noises.A similarity evaluation method of ship radiated noise signals is presented in this paper.The auditory,continuous spectrum,line spectrum and DEMON spectrum features are synthesized.And for each feature,its concrete properties used for evaluation and the corresponding similarity computation method are investigated and selected carefully.The total similarity evaluation value of two ship radiated noise signals is then calculated based on the similarity values of those four features.Numerical experiments are conducted with real measured ship radiated noise signals.The experiment procedures of similarity evaluation and experimental data analysis are provided in detail.Experimental results show that,the similarity values evaluated with the method coincide with the real similarity of measured ship radiated noise signals,and the evaluated similarity value ranges are easy to distinguish.Thus the evaluation results of the method are of high confidence.