Page 85 - 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 ⋄

基于分组时延预处理的时域波束形成方法 ∗

陈新华 † 郑恩明

(中国科学院声学研究所 北京 100190)

摘要 对于不等强度多目标情况下的弱目标检测问题，依据波束形成归一化指向性函数在目标方向上输出值
为 1、在非目标方向上输出值为小于 1 的特性，提出一种基于分组时延预处理的时域波束形成方法。该方法首
先对线列阵接收数据进行分组处理；然后，按搜索角度对各组数据进行时延预处理，并对各组预处理结果进行
相加，得到一组新数据；最后，对该组新数据按时域波束形成进行处理，得到该搜索角度对应波束值。理论推
导、数值仿真和试验数据处理结果均表明：相比常规时域波束形成，该方法所得波束形成指向性函数发生了变
化，旁瓣级得到了 13 dB 以上的改善，降低了强目标旁瓣级对弱目标检测的影响。
关键词 时域波束形成，指向性函数，分组时延预处理，旁瓣级，弱目标检测
中图法分类号: TB566 文献标识码: A 文章编号: 1000-310X(2019)04-0545-08
DOI: 10.11684/j.issn.1000-310X.2019.04.011

Time domain beam-forming algorithm based on sub-group & time delay

preprocessing

CHEN Xinhua ZHENG Enming

(Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China)

Abstract For the problem of weak targets detection under the condition of multiple targets, according to
the feature of the value of normalized directivity function being 1 on target direct and being less than 1
on non-target direct, a time domain beam-forming method based on sub-group & time delay preprocessing
was proposed. Firstly, makes sub-group preprocessing for linear array receiving data. Then, does time delay
pretreatment for the data of sub-group on the search angle, accumulates the results of time delay pretreatment
and obtains a new set of data. Lastly, obtains the beam value of the search angle by time delay beam-forming.
The theoretical analysis, numerical simulation and experimental results show that, compared with conventional
beam-forming, the directivity function of this method has changed, the side-lobe level is improved more than
13 dB, reduces the impact of side-lobe level on weak targets detection.
Key words Time domain beam-forming, Directivity function, Sub-group & time delay preprocessing, Side-
lobe level, Weak target detection

2019-01-28 收稿; 2019-04-16 定稿
国家自然科学基金项目 (61501450)
∗
作者简介: 陈新华 (1978- ), 男, 江苏泰州人, 博士, 研究员, 研究方向：水声信号与信息处理。
通讯作者 E-mail: chenxinhua@mail.ioa.ac.cn
†