调制状态下目标超分辨成像研究  

A Study on Super-resolution Imaging for Modulation Target

作　　者：句彦伟[1] 张燕[2] 

机构地区：[1]南京电子技术研究所,南京210039 [2]解放军理工大学理学院,南京211101

出　　处：《现代雷达》2013年第7期24-27,共4页Modern Radar

摘　　要：给出了一种调制状态下目标的超分辨逆合成孔径雷达成像方法,不仅解决了调制等因素对目标成像的影响,而且还提高了对目标的二维分辨能力。首先,利用复数经验模态分解算法将雷达回波分解,并弃除影响成像的调制成份,同时重构目标刚体回波;其次,利用回归模型和Burg算法对目标回波建模和估计;再次,基于估计的回归模型,对刚体回波的距离向和方位向外推来提高对目标的二维分辨能力;最后,利用经典的距离多普勒算法对目标稳健成像。基于仿真和实测数据,给出了文中方法与其他方法的成像结果。A super-resolution ISAR imaging approach for modulation target is proposed in this paper, which not only resolved influ- ence of modulation, but also improved the range resolution and azimuth resolution. Firstly, complex empirical mode decomposition algorithm is employed to extract object echo and remove modulation echo; Secondly, wide band echo model is built based on auto- regression model and Burg algorithm; Thirdly, image resolution is improved based on the auto-regression model; Finally, classical range-Doppler algorithm is used to obtain the robust imaging results. The approach is compared with the other three methods, and the effectiveness of the proposed approach is demonstrated by processing the simulation and real data.

关 键 词：逆合成孔径雷达成像 复数经验模态分解 超分辨成像 

分 类 号：TN958[电子电信—信号与信息处理]