针对典型凹腔结构的三维柱面精准成像算法  

Accurate 3D cylindrical imaging algorithm for typical concave objects

作　　者：司炜康 诸葛晓栋 苗俊刚[1] SI Weikang;ZHUGE Xiaodong;MIAO Jungang(Beijing Key Laboratory of Microwave Sensing and Security Application,College of Electronic Information Engineering Beihang University,Beijing 100191,China)

机构地区：[1]北京航空航天大学电子信息工程学院微波感知与安防应用北京市重点实验室,北京100091

出　　处：《电波科学学报》2022年第4期578-585,共8页Chinese Journal of Radio Science

基　　金：国家自然科学基金(62171011)。

摘　　要：主动式微波成像技术是以电磁波为媒介观察被测目标散射场并形成图像的手段.传统微波成像算法忽略了电磁波在目标内部结构中的耦合,导致包含多次散射的凹腔结构成像结果中往往伴随着十分严重的成像伪影.本文基于射线追踪原理,推导了圆柱扫描下二面角目标电磁波的传播规律.依据弹跳射线(shooting and bouncing rays,SBR)法中的相关思想,建立了典型凹腔结构的正向和逆向三维散射模型,并设计了完整的数据处理流程.仿真和实验结果表明了所提算法的有效性,为解决更复杂腔体的精准成像问题提供了基础.Active microwave imaging is a way of detecting targets by measuring the scattering field of the targets and then processing the data to obtain the images.Conventional microwave imaging algorithms ignore the electromagnetic wave coupling inside the concave targets,resulting in serious artifacts in the imaging results.In this paper,we derive the propagation principle of dihedral-type targets under cylindrical scanning based on the ray-tracing algorithm.According to the shooting and bouncing rays(SBR)concept,the three-dimensional forward and backward scattering models are established.At the same time,we propose a complete data processing flow.Simulation and experimental results show the effectiveness of the proposed algorithm,and this algorithm may pave a way for solving the imaging problem of more complex concave objects.

关 键 词：微波近程成像 多次反射 凹腔结构 弹跳射线(SBR)法 合成孔径雷达 

分 类 号：TN98[电子电信—信息与通信工程]