基于波束补偿的成像增强算法研究  

Research on imaging enhancement algorithm based on beam compensation

作　　者：宋少秋 邢世其[1] 汪俊澎 李永祯[1] 庞礴[1] SONG Shaoqiu;XING Shiqi;WANG Junpeng;LI Yongzhen;PANG Bo(State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学电子科技学院电子信息系统复杂电磁环境效应国家重点实验室,湖南长沙410073

出　　处：《系统工程与电子技术》2024年第4期1229-1235,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金(61901499,61971429)资助课题。

摘　　要：近场高分辨率成像的需求日益增加,传统的后向投影成像算法忽略了周围复杂电磁环境给成像带来的不良影响,在对回波进行相干积累的过程中不可避免地将周围杂波映射到目标图像网格上,导致图像质量较差。针对这一问题,提出一种基于天线方向图波束补偿的后向投影成像增强技术。该技术通过提前生成自适应能量衰减系数矩阵,对目标回波幅度进行衰减补偿,能有效抑制复杂电磁环境下强散射点给成像过程带来的不良影响。实测及实验结果表明,所提方法不仅在抑制杂波的前提下增强了图像质量,也能降低成像过程中相干积累的次数,提高了成像效率。There has been an increasing demand for high-resolution imaging in the near field,while traditional back-projection imaging algorithms ignore the adverse effects of the surrounding complex electromagnetic environment on imaging,and inevitably map the surrounding clutter onto the target image grid in the process of coherent accumulation of echoes,resulting in poor image quality.To address this problem,a backward projection imaging enhancement technique is proposed based on antenna directional map beam compensation.This technique can effectively suppress the adverse effects of strong scattering points on the imaging process in complex electromagnetic environments by generating an adaptive energy attenuation coefficient matrix in advance to compensate for the target echo amplitude.The measured and experimental results show that the proposed method not only enhances the image quality with the suppression of clutter,but also reduces the number of coherent accumulations during the imaging process,and improves the imaging efficiency.

关 键 词：高分辨率成像 后向投影算法 波束补偿 

分 类 号：TN95[电子电信—信号与信息处理]