高分辨率机载SAR地速误差补偿  

Forward Velocity Variation Compensation for High Resolution Airborne SAR

作　　者：蔡文伟[1] 雷万明[2] 

机构地区：[1]电子科技大学电工学院,成都610054 [2]南京电子技术研究所,南京210013

出　　处：《现代雷达》2007年第6期31-35,共5页Modern Radar

摘　　要：通过分析地速误差与回波相位的关系,以及地速误差的各类补偿方法,提出了基于数据插值的机载SAR地速误差补偿算法。该算法采用子孔径技术分段提取目标多普勒调频斜率,并通过低通滤波分离出载机前向速度,然后采用方位数据的插值补偿地速误差,有效地消除地速误差对成像的影响,获得满意的成像质量。文中还结合地速误差和摆动误差的补偿提出了机载SAR成像算法,高分辨实录数据的成像实验验证了本文算法的鲁棒性。By analyzing the relation of forward velocity variation and target echoes phase, as well as various kind compensation methods of forward velocity variation for airborne SAR, this paper proposes a new algorithm for forward velocity variation compensation based on data interpolation. This algorithm is to estimate all necessary Doppler chirp rate for the received data using sub - aperture technique, and to extract the aircraft forward velocity by low pass filter , then to compensate forward velocity variation by data interpolation in azimuth direction, hence effectively remove the effect of forward velocity variation for the SAR imaging so as to obtain well image quality. By motion compensation for forward velocity variation and displacement in line of sight, this paper also proposes the airborne SAR imaging algorithm , the imaging results of raw data validate this method robust.

关 键 词：地速误差 数据插值 机载SAR 成像 

分 类 号：V243.2[航空宇航科学与技术—飞行器设计]