Page 85 - 《应用声学》2020年第1期

第 39 卷 第 1 期 Vol. 39, No. 1
2020 年 1 月 Journal of Applied Acoustics January, 2020

⋄ 李启虎院士八十华诞学术论文 ⋄

基于多途信道的舰船辐射噪声功率谱密度估计 ∗

蒋国庆 1,2 孙 超 1,2† 刘雄厚 1,2 李明杨 1,2 蒋光禹 1,2

(1 西北工业大学航海学院 西安 710072)
(2 海洋声学信息感知工业和信息化部重点实验室 (西北工业大学) 西安 710072)

摘要：针对低信噪比下利用单水听器估计辐射噪声功率谱密度精度较差的问题，提出一种基于多途信道传输
函数估计的垂直阵测量估计 1 m 处舰船辐射噪声功率谱密度的方法。该方法将信道传输函数表示为多途路径
近场阵列流形向量的叠加，较快地估计了信道传输函数，将其用于舰船辐射噪声功率谱密度估计，可较简便地
估计距声中心 1 m 处辐射噪声的功率谱密度，即谱源级。分析了产生功率谱密度估计误差的原因，包括信道估
计误差和环境噪声引起的误差，为降低估计误差提供了理论依据。仿真结果表明，该方法估计 1 m 处辐射噪声
功率谱密度的性能良好。
关键词：舰船辐射噪声；功率谱密度估计；多途信道估计；垂直阵
中图法分类号: TB52+6 文献标识码: A 文章编号: 1000-310X(2020)01-0081-08
DOI: 10.11684/j.issn.1000-310X.2020.01.010

Power spectral density estimation of ship-radiated noise based on
multipath channel

JIANG Guoqing 1,2 SUN Chao 1,2 LIU Xionghou 1,2 LI Mingyang 1,2 JIANG Guangyu 1,2

(1 School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China)
(2 Key Laboratory of Ocean Acoustics and Sensing (Northwestern Polytechnical University), Ministry of Industry and
Information Technology, Xi’an 710072, China)

Abstract: A power spectral density (PSD) estimation method based on the multipath channel estimation
with a vertical linear array (VLA) for ship-radiated noise at 1 meter is proposed to solve the poor accuracy of
the PSD estimated by a single hydrophone at the low signal-to-noise ratio (SNR). In this method, the channel
transfer function is approximated by the superposition of the near-field array manifold vectors of different paths
for convenience, which can be used to estimate the PSD of ship-radiated noise at a distance of 1 meter from
the sound center. The reasons for PSD estimation error, including the estimated channel error and the ambient
noise, are analyzed, which provides a theoretical basis for reducing estimation error. The numerical results
show that the proposed method can estimate the PSD of the radiated noise at 1 meter well.
Keywords: Ship-radiated noise; Power spectral density estimation; Multipath channel estimation; Vertical
linear array

2019-02-15 收稿; 2019-11-28 定稿
国家自然科学基金重点项目 (11534009)
∗
作者简介: 蒋国庆 (1993– ), 男, 陕西蒲城人, 博士研究生, 研究方向: 阵列信号处理。
† 通信作者 E-mail: csun@nwpu.edu.cn