基于小波分析的多波束声呐图像角度响应改正方法  

Angular response correction method of multibeam sonar images based on wavelet analysis

作　　者：朱正任 冯成凯 徐琪尧 韩冰[1] 付桂合 阳凡林[1,2] ZHU Zhengren;FENG Chengkai;XU Qiyao;HAN Bing;FU Guihe;YANG Fanlin(College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;Key Laboratory of Surveying and Mapping Technology on Island and Reef,National Administration of Surveying,Mapping and Geoinformation,Qingdao,Shandong 266590,China)

机构地区：[1]山东科技大学测绘与空间信息学院,山东青岛266590 [2]海岛(礁)测绘技术国家测绘地理信息局重点实验室,山东青岛266590

出　　处：《山东科技大学学报（自然科学版）》2021年第2期31-40,共10页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家重点研发计划项目(2018YFF0212203,2017YFC1405006,2018YFC1405900,2016YFC1401210);山东省重点研发计划项目(2018GHY115002)。

摘　　要：多波束声呐图像在海底底质分类中具有重要应用,而角度响应(angular response,AR)对多波束声呐图像的影响较大,给声呐图像的判读带来了困难。为此,针对多波束角度响应曲线具有非平稳离散随机信号的特点,提出一种基于小波分析的多波束声呐图像角度响应改正方法。首先,将AR曲线进行小波分解,获得长波项和短波项;然后,分别绘制长波项和短波项的三维概率密度图,通过短波项的三维概率密度图获得小波分解的最优参数,通过长波项的三维概率密度图对多波束条带进行同底质区域的划分;最后,在同底质区域下进行长波项的AR改正,将改正后的长波项和短波项进行信号重构,获得高质量的多波束声呐图像。实验分析表明,该方法在保留原始细节的基础上,有效削弱了角度响应对声呐图像的影响,对多波束声呐图像处理具有参考和应用价值。Multibeam sonar images have important applications in seabed substrate classification,but they are signifi-cantly influenced by angular response(AR),which brings difficulties to their interpretation.Considering the cha-racteristics of multibeam AR curves with non-stationary discrete random signals,an angular response correction method of multibeam sonar images based on wavelet analysis is proposed in this paper.Firstly,the AR curve was decomposed by wavelet to obtain long-wave term and short-wave term.Then,3D histograms of long-wave and short-wave terms were drawn respectively to obtain the optimal parameters of wavelet decomposition and the division of multibeam bands with the same substrate area respectively.Finally,AR correction of long-wave term was carried out in the same substrate area,and the corrected long-wave and short-wave term were reconstructed to obtain high-quality multibeam sonar images.Experimental analysis shows that this method can effectively reduce the influence of angular response on sonar images while retaining the original details,and thus has reference and application value for multibeam sonar image processing.

关 键 词：多波束 反向散射强度 小波分析 三维概率密度 角度响应 

分 类 号：P229[天文地球—大地测量学与测量工程]