Page 214 - 应用声学2019年第4期

第 38 卷 第 4 期 Vol. 38, No. 4
2019 年 7 月 Journal of Applied Acoustics July, 2019

⋄ 李启虎院士八十华诞学术论文 ⋄

连续波主动声呐的直达波抑制处理方法研究 ∗

周泽民 曾新吾 † 关承宇 蒋小为

(国防科技大学气象海洋学院 长沙 410073)

摘要 针对连续波主动声呐面临的强直达波干扰掩蔽目标回波的问题，该文在双基地配置已知的前提下，提
出基于声屏蔽和常规方向零陷的联合抑制方法。即在精确的发射点声屏蔽的基础上，利用常规方向零陷技术
减少声源附近方位的能量影响，从而达到更好地消除强直达波干扰的目的。仿真结果表明，在极低的信干比条
件下，联合抑制方法比声屏蔽方法、常规方向零陷方法具有更好的干扰抑制性能。该方法可以有效减少连续波
主动声呐的直达波的影响，在时间 -距离模糊度图上得到清晰的目标位置。
关键词 连续波主动声呐，直达波，波束零陷，声屏蔽
中图法分类号: TB566 文献标识码: A 文章编号: 1000-310X(2019)04-0674-07
DOI: 10.11684/j.issn.1000-310X.2019.04.026

Research on strong direct blast suppression for continuous active sonar

ZHOU Zemin ZENG Xinwu GUANG Chengyu JIANG Xiaowei

(College of Meteorology and Oceanology, National University of Defense Technology, Changsha 410073, China)

Abstract In view of the problem of target echoes interfered by strong direct blast in continuous active
sonars, a combined suppression method based on acoustic covering and Bartlett null-forming is proposed
when the deployment is known. The acoustic covering weight can be precisely obtained under the known
bistatic deployment, while Bartlett null-forming technique reduces the beam energy around the acoustic source
direction. In this way, the combined method may provide significant improvement in strong direct blast
suppression. The simulation results based on data under the extremely low signal-to-interference ratio show
that a deeper null zone appears compared to acoustic covering method and Bartlett null-forming method. The
combined method implementation used to generate range-time image can be seen to offer clearly target location
and shown potential of the approach.
Key words Continuous active sonars, Direct blast, Null-forming, Acoustic covering

2019-02-18 收稿; 2019-04-09 定稿
国防科技大学科研计划项目 (JC15-11-01)
∗
作者简介: 周泽民 (1986- ), 男, 湖南永州人, 博士, 助理研究员, 研究方向: 声信号处理。
† 通讯作者 E-mail: xinwuzeng@nudt.edu.cn