基于匹配追踪和Radon变换的LFM信号宽带时延-时间伸缩声成像方法  

Wide-band Acoustic Imaging Approach Based on Matching Pursuit and Radon Transform

作　　者：石敏[1] 张静远[2] 蒋兴舟[2] 逄妍立[1] 

机构地区：[1]海军装备研究院,北京100073 [2]海军工程大学,武汉430033

出　　处：《武汉理工大学学报（交通科学与工程版）》2006年第3期381-383,416,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金项目资助(批准号:60272063)

摘　　要：分析了宽带延展目标的时延-时间伸缩效应,及其导致的回波信号在时域和频率域的特性.针对LFM信号的时频分布特点,利用匹配追踪和R adon变换,提出了一种提取LFM信号在时-频域分布特性参数的时延-时间伸缩声成像方法,有效避免了利用W VD时产生的交叉项影响.通过计算机仿真与实验验证,表明该方法是有效的.A wide band acoustic imaging approach of underwater target based on LFM signal＇s time delaytime stretch model is presented. Wide band extension target＇s time delay-time stretch effect and LFM signal＇s time frequency domain characteristics are analysised. Using matching pursuit, the defects of WVD＇s cross item are removed, and then we get echo wave＇s time frequency distribution： a series of lines which have different slope coefficient and interception. We use Radon transform to extract the line character, and then get the time delay and time stretch parameters. The results of computer simulation confirm the alidity of this approach.

关 键 词：匹配追踪 RADON变换 时延-时间伸缩 宽带声成像 

分 类 号：TJ630[兵器科学与技术—武器系统与运用工程]