高分辨率机载调频步进SAR成像处理  

High Resolution Airborne Stepped-frequency SAR Imaging

作　　者：韩冰[1,2] 梁兴东[1] 李道京[1] 丁赤飚[1] 

机构地区：[1]中国科学院电子学研究所微波成像技术国防重点实验室,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《系统仿真学报》2009年第17期5511-5515,共5页Journal of System Simulation

基　　金：中科院国防科技创新基金(CXJJ-158)

摘　　要：针对调频步进体制合成孔径雷达(SAR)成像中的子脉冲-距离耦合问题,在分析其特征表现的基础上,给出了子脉冲-距离耦合影响程度与系统成像参数之间的定量关系,提供了判断其影响的理论依据;在深入分析和讨论了高分辨率机载调频步进SAR成像和运动补偿中的特殊问题后,基于子图像相参累加(SCA)成像算法,提出了结合运动补偿的成像处理方案,解决了机载高分辨率调频步进SAR精确成像的问题。计算机仿真实验验证了方案的有效性。Concerning stepped-frequency SAR （Synthetic Aperture Radar） imaging, the characteristic and behavior of its inherent phenomenon which was called ‘the coupling between sub-pulse and range＇ was described, then the impact of this coupling on image formation was quantitatively analyzed with system parameters which provided a method for analyzing the affection in theory. Finally, after deeply analyzing and discussing about the particularity of imaging and motion compensation for stepped-frequency SAR, a processing scheme integrated with the sub-image coherent accumulation imaging algorithm and motion compensation was presented, which could realize the accurate imaging for high resolution airborne stepped-frequency SAR. Computer simulation results validating the scheme were given.

关 键 词：合成孔径雷达 调频步进 栅瓣 子脉冲-距离耦合 运动补偿 

分 类 号：TN957.52[电子电信—信号与信息处理]