机动飞行条件下基于SIFFBP算法的机载UWB SAR成像  

Focusing of airborne UWB SAR data under the condition of platform maneuvers by using SIFFBP algorithm

作　　者：严少石[1] 李悦丽[1] 林世斌[1] 周智敏[1] 安道祥[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2013年第2期63-68,共6页Journal of National University of Defense Technology

基　　金：国家自然科学基金项目(61201329)

摘　　要：机动飞行条件下,运动误差的幅度较大,频域运动补偿精度难以满足机载超宽带合成孔径雷达(UWB SAR)高精度成像的要求,需要采用精确的时域后向投影(Back Projection,BP)算法,然而原始BP算法的巨大计算量限制了其实际应用。提出了一种基于子图像快速因式分解BP(Sub-image Fast Factorized BackProjection,SIFFBP)算法的机动飞行条件下机载UWB SAR成像方案,并对其子孔径和子图像划分的约束关系进行了推导,给出了算法步骤,并分析了算法的计算量。仿真和实测数据处理结果表明,SIFFBP算法能够在保证处理精度的同时,大幅度提高处理效率,非常适合于机动飞行条件下的机载UWB SAR成像处理。Under the condition of platform maneuvers, the accuracy of the motion compensation in frequency-domain cannot meet the focusing need of airborne Ultra-wideband Synthetic Aperture Radar （ UWB SAR） because of strong motion errors. The time-domain Back Projection （BP） algorithm can be used in this instance, whereas the large amount of computation limits its application. In light of this, a strategy of processing the airborne UWB SAR data with platform maneuvers is proposed by using the Sub-image Fast Factorized Back Projection （SIFFBP） algorithm. The constrain relationship between the sub-aperture and sub-image factorization was derived, and then the implementation approach was listed with the computation volume being analyzed. The processing results of the simulated and real data show that SIFFBP algorithm is applicable for the focusing of airborne UWB SAR under the condition of platform maneuvers with high precision and effieieney.

关 键 词：机载UWB SAR 机动飞行 运动补偿 SIFFBP算法 

分 类 号：TN957[电子电信—信号与信息处理]