广义边缘CWD-Hough变换在宽带声成像中的应用  

Wide-band acoustic imaging using GMCWD-Hough transform

作　　者：颜礼彬[1] 

机构地区：[1]海军工程大学,武汉430033

出　　处：《声学技术》2009年第1期68-72,共5页Technical Acoustics

基　　金：国家自然科学基金资助项目(60272063)

摘　　要：提出了一种基于广义边缘CWD-Hough(GMCWD-Hough)变换的宽带声成像方法。分析了基于时间伸缩-时延的宽带相关声成像的基本模型,介绍了广义边缘CWD-Hough变换。根据目标回波的时频分布特点,该方法基于时间-频率联合分析法,提取信号在时频域的分布特性参数进行时间伸缩-时延的声成像。通过设计合理的广义边缘核函数,能有效避免常用的WVD方法产生的交叉项影响,检测性能优于常用的Wigner-ville分布方法。实验结果表明该声成像方法的有效性,不仅适合水声宽带成像,而且对于低信噪比条件下的其它成像方式也具有参考价值。A wideband time delay-time stretch acoustic imaging approach of underwater target based on genera- lized-marginal Choi-Williams distribution-Hough （GMCWD-Hough） transform is presented. Wide band extension target＇s delay-time stretch effect and GMCWD-Hough transform are introduced and analyzed. According to the echo signal of wide band model, a new method for detecting and imaging the slowly moving targets is proposed. By designing the reasonable kernel function for GMCWD, the cross item influence of common WVD method can be almost avoided, Its detecting performance is better than the common method based on common Wigner-Ville distribution. The results of experiment confirm the validity of this approach. The method is not only fit for wide band acoustic imaging, but also has reference value for other imaging mode under low signal-noise ratio.

关 键 词：宽带声成像 广义边缘CWD—Hough变换 时延-时间伸缩 

分 类 号：TJ630[兵器科学与技术—武器系统与运用工程]