远场大转角时水下典型目标回波建模与成像  

Echo Modeling and Imaging for Underwater Typical Targets in Far-field With Large Rotation Angle

作　　者：程广利[1] 张明敏[1] 徐国军[1] 

机构地区：[1]海军工程大学电子工程系,武汉430033

出　　处：《武汉理工大学学报（交通科学与工程版）》2008年第6期1091-1093,1124,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国防预研资助项目(批准号:5130302040202)

摘　　要：为了解决当水下目标位于声呐远场且转动角度较大时,运用距离-多普勒算法成像存在的图像模糊难题,基于物理声学方法建立了此时水下典型目标的回波信号模型,运用极坐标格式算法对目标进行成像,讨论了不同的插值算法对成像效果的影响,实现了刚性有限长圆柱体和椭球目标成像.仿真结果表明成像效果良好,有效克服了散射点越分辨单元走动的影响.To resolve the prOblem of blurring imaging generated by Range-Doppler Algorithm （RDA） for underwater target which relative to the sonar platform is in far-field and rotation angle is large, echo signals of underwater typical targets are modeled based on physical acoustical method, and imaginaries of the targets are achieved using Polar Formation Algorithm （PFA）, then effect of different interpola- tion algorithms on imaging quality is discussed. Rigid cylinder with finite length and prolate spheroid are imaged by the proposed methods, and the imaging effect is good, which can be used to image underwater typical targets in far-field with large rotation angle to overcome the effect of Migration Through Resolution Cell （MTRC） of scattering points.

关 键 词：远场大转角 水下典型目标成像 回波建模 物理声学方法 极坐标格式算法 

分 类 号：U666.7[交通运输工程—船舶及航道工程] TB56[交通运输工程—船舶与海洋工程]