双基地雷达两极区ISAR超分辨成像  

Super Resolution ISAR Imaging in Receiver Centered Region Area in Bistatic Radar

作　　者：张龙[1,2] 苏涛[1] 刘峥[1] 贺小慧[1,2] 段永强[3] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071 [2]西安工程大学电子与信息学院,西安710048 [3]中国科学院西安光学精密机械研究所,西安710068

出　　处：《光子学报》2015年第3期94-101,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61001204);国家部委预研基金项目(No.9140A07030211DZ0113);中国博士后科学基金(No.2013M542329);陕西省自然科学基础研究计划项目(No.2012JM8015);陕西省教育厅专项计划项目(Nos.12JK0530;12JK0557);西安工程大学博士科研启动基金(No.BS1119)资助

摘　　要：由于双基地雷达中两极区双基地角的时变特性,传统ISAR成像法无法获取高分辨的目标像.分析了两极区双基地角的时变性及对距离包络和方位的影响,就两极区目标运动模型中目标方位高次项提出了Radon-TCDS-Relax超分辨成像算法,对每个距离单元进行调频率和调频率变化率搜索并补偿其所对应的方位高次相位误差,用Radon-TCDS-Relax提取散射点实现TCD-RID成像.仿真实验与分析验证了本文方法的有效性.For the time-variant property of bistatic angles in Receiver Centered Region Area in bistatic radar system,iris difficult to obtain high resolution ISAR image of target in by using the conventional imaging methods. The signal model for bistatic ISAR was presented, then the time-variant property of the bistatic angles and its influence on range envelope and azimuth was analyzed. A Radon-TCDS-Relax super- resolution imaging method was brought up for eliminate the effect from high-order azimuth terms of target motion model in receiver centered areas. The chirp rate and its changing rate corresponding to high- order phase terms in cross range was estimated by the proposed method. Scatterers extracting and imaging were achieved by Radon-TCDS-RELAX and TCD-RID respectively. Accuracy analysis and the experimental results with real data both demonstrate the effectiveness of the proposed method.

关 键 词：ISAR成像 双基地雷达 时间调频率分布搜索 超分辨 RADON变换 

分 类 号：TN959.1[电子电信—信号与信息处理]