CAJ | 학술논문

利用集合经验模态分解方法研究舰船辐射噪声的特征参数提取及分类，对预处理后三种不同类别舰船辐射噪声进行能量分析，讨论其高低频能量差特征参数。计算不同类别、一定样本数量的舰船辐射噪声高低频能量差发现，同类舰船高低频能量差基本处于同一水平，不同类型舰船高低频能量差存在明显差异。结果表明，利用集合经验模态分解方法提取的舰船辐射噪声特征参数对舰船类别具有较好的可分性。可为水下目标信号探测及识别提供参考。
이용집합경험모태분해방법연구함선복사조성적특정삼수제취급분류，대예처리후삼충불동유별함선복사조성진행능량분석，토론기고저빈능량차특정삼수。계산불동유별、일정양본수량적함선복사조성고저빈능량차발현，동류함선고저빈능량차기본처우동일수평，불동류형함선고저빈능량차존재명현차이。결과표명，이용집합경험모태분해방법제취적함선복사조성특정삼수대함선유별구유교호적가분성。가위수하목표신호탐측급식별제공삼고。
The method of ensemble empirical mode decomposition has been developed for nonlinear and non-stationary signal.The method can be applied to the feature extraction and classification of ship radiated noise.Three different types of ship radiated noises were chosen to perform the energy analysis.After pretreatment,the ship radiated noise was decomposed into several intrinsic mode functions by ensemble empirical mode decomposition,and the energy difference between the high and low frequency was extracted and analyzed.The results show that the energy difference between the high and low frequency is at the same level for similar ships,but there is obvious difference for different types of ships.Therefore,it is concluded that the energy difference between the high and low frequency can be used as a new feature of ship signals.It provides an alternative for detecting and recognizing underwater target signals.