Page 14 - 《应用声学》2021年第6期

第 40 卷 第 6 期 Vol. 40, No. 6
2021 年 11 月 Journal of Applied Acoustics November, 2021

⋄ 研究报告 ⋄

稳健声线扰动特征用于浅海小目标定位 ∗

刘帅京 1,2 许 枫 1† 杨 娟 1

(1 中国科学院声学研究所 海洋声学技术中心 北京 100190)
(2 中国科学院大学 北京 100049)
摘要：针对海洋环境中的信道起伏变化对基于扰动声线声压敏感核的水下小目标定位算法影响较大的问题，
提出了基于稳健声线扰动特征的目标定位方法，该方法首先对海洋环境中接收声场的到达结构进行分析，提
取稳态的到达成分；然后通过观测稳健声线对应的接收信号在目标穿越过程中的扰动特征提取扰动声线；最
后应用扰动声线类定位方法得到水下目标的定位模糊图实现定位。在浅海港口环境中开展了蛙人穿越实验，
发射信号为中心频率为 22.5 kHz、带宽为 15 kHz 的线性调频信号。实验数据的处理结果表明，直达路径和一
次水底反射路径受信道起伏的影响较小，通过筛选稳健声线可以将扰动声线的定位方法用于自然的海洋环境。
关键词：扰动声线；前向散射；浅海波导；声压敏感核；小目标探测
中图法分类号: TB566 文献标识码: A 文章编号: 1000-310X(2021)06-0810-11
DOI: 10.11684/j.issn.1000-310X.2021.06.002

Small target localization in shallow sea based on the perturbation feature
of stable eigenrays

LIU Shuaijing 1,2 XU Feng 1 YANG Juan 1

(1 Ocean Acoustic Technology Center, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China)
(2 University of Chinese Academy of Sciences, Beijing 100049, China)

Abstract: The environment fluctuations will affect the performance of small target localization method which
based on the perturbed eigenrays. Thus, a method based on the perturbation feature of stable eigenrays is
put forward. The proposed method achieved localization by utilizing the characteristics of perturbed eigenrays
which are selected in stable arrival structure in the real environment at sea. A diver crossing experiment is
carried out in the dynamic coastal environment. The linear frequency modulated signal is used as transmitted
signal. The center frequency and the bandwidth are 22.5 kHz and 15 kHz respectively. The analysis of
environment fluctuations shows that the direct path and the once bottom bounce path are less affected by
the channel fluctuations. The processing result suggested that the presented method is applicable for dynamic
at-sea environment.
Keywords: Perturbed eigenrays; Forward scattering; Shallow water waveguide; Pressure sensitivity kernel;
Small target detection

2021-01-09 收稿; 2021-04-01 定稿
国家自然科学基金项目 (41527901), 国家重点研发计划项目 (2017YFC0821202), 中国科学院战略性先导科技专项 (XDA13030604)
∗
作者简介: 刘帅京 (1994– ), 女, 山西晋城人, 博士研究生, 研究方向: 水声信号处理。
通信作者 E-mail: xf@mail.ioa.ac.cn
†