一种高分辨率弹载聚束式SAR成像算法  

An Imaging Algorithm for High-resolution Missile-borne Spotlight SAR

作　　者：张冬磊[1] 王蜂[1] 

机构地区：[1]第二炮兵工程学院,西安710025

出　　处：《战术导弹技术》2011年第2期79-84,共6页Tactical Missile Technology

摘　　要：弹载SAR通过在距离向发射大带宽调频信号,方位向采用聚束模式来获得二维高分辨率,由此带来高数据率并造成频谱混叠,导弹的非平面运动会引入空变的相位误差.针对上述两个问题,提出了TDDRD算法,该算法利用二维Deramp处理降低了数据率并解决了频谱混叠效应,进而应用改进RD算法,补偿加速度引入的线性、二次及三次相位误差.计算机仿真通过对比未补偿和补偿加速度的成像结果,验证了该算法的有效性,证明该算法可用于高分辨率弹载聚束式SAR成像.Missile-borne SAR acquires two-dimensional,high-resolution by transmitting big bandwidth frequency-modulated signal and adopting spotlight mode which causes high data rate spectral folding phenomenon.The non-plane motion of missile will bring space-variant phase error.TDDRD（Two Dimensions Deramp Range Doppler）algorithm to address the above two problems is presented,which decreases data rate and resolves the spectral folding phenomenon,then compensates linear secondary and cubic phase error brought by acceleration.Simulation proves the efficiency of the algorithm by comparing the result compensated with the result,non-compensated,showing that the algorithm can be applied to high-resolution missileborne spotlight SAR imaging.

关 键 词：高分辨率 弹载 聚束式SAR deramp处理 RD算法 

分 类 号：TN957[电子电信—信号与信息处理]