利用盲反卷积和混沌振子增强船舶辐射噪声解调线谱  

Demodulation line spectrum of ship radiated noise enhancement using blind deconvolution and chaotic oscillator

作　　者：陈家豪 林建恒[1] 孙军平 江鹏飞 衣雪娟 单元春 李娜 郭圣明 CHEN Jiahao;LIN Jianheng;SUN Junping;JIANG Pengfei;YI Xuejuan;SHAN Yuanchun;LI Na;GUO Shengming(Qingdao Branch,Institute of Acoustics,Chinese Academy of Sciences,Qingdao 266114;Key Laboratory of Underwater Acoustic Environment,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院声学研究所北海研究站,青岛266114 [2]中国科学院水声环境特性重点实验室,北京100190 [3]中国科学院大学,北京100049

出　　处：《声学学报》2024年第1期104-116,共13页Acta Acustica

基　　金：国家自然科学基金项目(12274433);国防基础科研项目(JCKY2021207CH06);中国科学院声学研究所自主部署项目(MBDX202102);国防基础科研计划(JCKYS2022604SSJS007)资助。

摘　　要：针对经典解调方法中心频率、带宽选择困难和解调线谱受带外噪声干扰难以分辨等问题,提出采用盲反卷积和混沌振子方法抑制带外噪声,增强船舶噪声解调线谱。该方法通过Duffing振子预检宽带船舶噪声低频弱周期信号,随后将相应频率作为最小噪声幅值比反卷积(MNAD)方法的先验参数,利用MNAD方法自适应搜索解调频带得到可清晰分辨的高信噪比解调线谱。仿真和实测数据分析表明,该方法较经典解调方法和其他盲反卷积方法,可获取更佳的中心频率和滤波带宽,所得解调线谱的窄带信噪比DF值最高。The extraction of demodulation spectrum using classical demodulation methods faces challenges such as difficulty in selecting the demodulation center frequency and bandwidth,and the interference of out-of-band noise in distinguishing the demodulation spectrum.This study proposes an approach that integrates blind deconvolution and chaotic oscillator techniques to efficiently minimize out-of-band noise and enhance the demodulation spectrum.The utilization of the Duffing oscillator is employed as a means to pre-detect low-frequency weak periodic signals inside the wideband ship radiated noise.Following this,the associated frequency is utilized as the prior parameter for the minimum noise amplitude deconvolution(MNAD)technique.The MNAD approach is employed to perform an adaptive search for the demodulation frequency band,resulting in the successful attenuation of noise signals that exist beyond the demodulation band.Ultimately,the demodulation spectrum is achieved with clarity and distinctiveness,accompanied by high signal-to-noise ratios.The results obtained from simulations and measured data prove that this method outperforms classical demodulation methods and other blind deconvolution methods in terms of gaining center frequencies and filtering bandwidths.The demodulation spectrum obtained by this method demonstrates the highest narrowband signal-to-noise ratio,as indicated by the DF value.

关 键 词：船舶辐射噪声 解调线谱 盲反卷积 混沌振子 

分 类 号：U661.44[交通运输工程—船舶及航道工程]