基于精确时延并行时域算法的低频合成孔径系统  

Low frequency synthetic aperture system based on accurate time delay and parallel time domain algorithm

作　　者：周跃涛[1,2,3] 王朋 黄海宁[1,2] ZHOU Yuetao;WANG Peng;HUANG Haining(Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China;Key Laboratory of Science and Technology on Advanced Underwater Acoustic Signal Processing, Chinese Academy of Sciences, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100190, China)

机构地区：[1]中国科学院声学研究所,北京100190 [2]中国科学院先进水下信息技术重点实验室,北京100190 [3]中国科学院大学,北京100190

出　　处：《哈尔滨工程大学学报》2020年第5期698-704,共7页Journal of Harbin Engineering University

基　　金：国家高技术研究发展计划项目(2013AA092701);中国科学院声学研究所青年英才计划项目(Y754211211)。

摘　　要：为了提高对掩埋目标的探测能力以及成像分辨率,本文提出了一种基于精确时延并行时域逐点算法的低频合成孔径掩埋目标探测系统,该系统包括3个部分:宽带信号发射系统、信号采集系统及信号处理系统。信号处理系统采用基于精确时延的并行时域逐点成像算法进行成像处理。相比于传统的时域合成孔径成像算法,基于精确时延的并行时域逐点成像算法,可以有效地解决掩埋目标成像中由于水中和沉积层中声速的剧烈变化导致的散焦问题,具有对此类目标更高的成像分辨率,并且其计算效率更高,具有实时性上的优势。基于该成像算法,设计并实现了一套实时低频合成孔径掩埋目标探测系统,通过多次湖上及海上实验对该系统进行测试,实验结果表明:该系统可以有效获取水下掩埋目标图像,并且聚焦效果良好。To improve both the ability to detect underwater buried objects and the imaging resolution,in this paper,we propose a buried-object detection system using a low-frequency synthetic aperture based on an accurate-time-delay and parallel-time-domain point-by-point algorithm.This system consists of three parts:a broadband signal transmitter,a signal collection system,and a signal processing system.The signal processing system uses a parallel-time-domain point-by-point imaging algorithm with accurate time delay to obtain buried-object images.Compared with the traditional-time-domain synthetic-aperture-sonar imaging algorithm,the proposed algorithm has the advantages of higher computation efficiency,real-time performance,and improved imaging resolution.It is especially useful for buried targets,whose images become defocused because of sharp changes in the sound velocity in the water and settled layer.Based on the proposed imaging method,we designed and developed a real-time low-frequency synthetic-aperture buried-object detection system,and conducted extensive lake and sea trials.The test results demonstrate that the system can effectively obtain images of underwater buried objects with better focus.

关 键 词：声呐信号处理 水声成像 掩埋目标探测 合成孔径 时域逐点成像算法 精确时延 成像分辨率 并行算法 

分 类 号：U666.7[交通运输工程—船舶及航道工程]