船舶辐射噪声DEMON线谱相位差特征提取  

Study on phase difference extraction of ship radiated noise line spectrum in DEMON spectrum

作　　者：潘丁宁 胡长青[1] 赵梅[1] 杨雪峰[1] PAN Dingning;HU Changqing;ZHAO Mei;YANG Xuefeng(Shanghai Acoustics Laboratory,Chinese Academy of Sciences,Shanghai 201815,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院声学研究所东海研究站,上海201815 [2]中国科学院大学,北京100049

出　　处：《声学技术》2025年第2期171-180,共10页Technical Acoustics

基　　金：国家自然科学基金(12004414)。

摘　　要：研究了船舶螺旋桨噪声和轴系噪声的噪声包络调制检测(detection of envelope modulation on noise, DEMON)谱的轴频线谱相位特性,提出了一种新的船舶目标特征即船舶螺旋桨噪声与轴系噪声轴频线谱之间的相位差。通过对船舶辐射噪声中螺旋桨噪声和轴系噪声轴频线谱相位的分析,指出二者相位存在一个较稳定的相位差。通过建模和仿真验证了相位差提取的可行性,并据此提出一种船舶螺旋桨噪声与轴系噪声的轴频线谱相位差特征提取方法。利用文章提出的特征提取方法,对实验中获取的船舶辐射噪声数据进行相位差特征提取,研究了在不同航速和相同型号不同个体目标船舶两种条件下,相位差特征的稳定性和可分性。结果表明在一定的时间窗内,相位差特征在不同航速下具有较好的稳定性,在相同型号船舶间具有较好的可分性,可以为个体船舶目标识别提供参考。Based on the research on phase characteristics of the line spectra of ship propeller noise and shafting noise,it is found that there is a relatively stable phase difference between shaft frequency line spectra of propeller noise and shafting noise.Therefore,the phase difference is proposed to be a new ship recognition feature.The feasibility of phase difference extraction is verified by modeling and simulation,and a method for extracting phase difference between shaft frequency line spectra of propeller noise and that of shafting noise is proposed.The phase difference feature of experimental ships is extracted from the obtained radiated noise data.The stability and discrimination of phase difference feature are studied among different individual ships at different speeds with specific time length noise.The results show that the phase difference feature has good stability at different speeds and good discrimination among different ships of the same type.It can be a new method for ship target recognition.

关 键 词：船舶辐射噪声 噪声包络调制检测(DEMON)谱 相位特性 特征提取 

分 类 号：TN911.7[电子电信—通信与信息系统]