海军工程大学学报
海軍工程大學學報
해군공정대학학보
JOURNAL OF NAVAL UNIVERSITY OF ENGINEERING
2014年
4期
50-54,62
,共6页
舰船辐射噪声%特征提取%混沌%局部投影滤波
艦船輻射譟聲%特徵提取%混沌%跼部投影濾波
함선복사조성%특정제취%혼돈%국부투영려파
ship-radiated noise%feature extraction%chaos%local project noise reduction
针对不同目标舰船的辐射噪声信号特征提取问题，提出了将混沌理论用于非线性时间序列的分析方法。该方法利用非线性局部投影滤波方法进行信号降噪，并在重构相空间的基础上对每一类舰船辐射噪声信号的最大Lyapunov指数、自然测度和关联维数等非线性特征参数进行提取。实验结果表明：当舰船辐射噪声信号的最大Lyapunov指数大于0且为有限值时，舰船辐射噪声信号具有混沌特性；自然测度和关联维数可作为区分不同目标船型的舰船辐射噪声信号的有效特征。
針對不同目標艦船的輻射譟聲信號特徵提取問題，提齣瞭將混沌理論用于非線性時間序列的分析方法。該方法利用非線性跼部投影濾波方法進行信號降譟，併在重構相空間的基礎上對每一類艦船輻射譟聲信號的最大Lyapunov指數、自然測度和關聯維數等非線性特徵參數進行提取。實驗結果錶明：噹艦船輻射譟聲信號的最大Lyapunov指數大于0且為有限值時，艦船輻射譟聲信號具有混沌特性；自然測度和關聯維數可作為區分不同目標船型的艦船輻射譟聲信號的有效特徵。
침대불동목표함선적복사조성신호특정제취문제，제출료장혼돈이론용우비선성시간서렬적분석방법。해방법이용비선성국부투영려파방법진행신호강조，병재중구상공간적기출상대매일류함선복사조성신호적최대Lyapunov지수、자연측도화관련유수등비선성특정삼수진행제취。실험결과표명：당함선복사조성신호적최대Lyapunov지수대우0차위유한치시，함선복사조성신호구유혼돈특성；자연측도화관련유수가작위구분불동목표선형적함선복사조성신호적유효특정。
An analysis method of nonlinear time-series based on chaos is proposed for the extraction of different ship-radiated noise characteristic parameters ,such as phase-space reconstruction and nonli-near local project noise reduction .T he method can be used to recover the origin signal and the phase trajectories effectively from the noise environment and to extract the nonlinear characteristic parame-ters of the maximum Lyapunov exponent , correlation dimension and natural measure of the ship-radiated signals on the basis of phase-space reconstruction .The experimental results show that ship-radiated noise is indeed chaotic because its largest Lyapunov exponent is positive ,and that both of cor-relation dimension and natural measure are regarded as the effective features of distinguishing the noise signals radiated form different types of ships .
