基于相位梯度自动聚焦的机载雷达成像试验  

Airborne L-SAR Imaging Experiment Based on Phase Gradient Autofocus

作　　者：谭衢霖[1] 蒋金雄[1] 李晓芳[1] 刘正军[2] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中国测绘科学研究院摄影测量与遥感所,北京100039

出　　处：《上海交通大学学报》2008年第2期299-303,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(4040107);北京交通大学校基金(2005SM036)资助项目

摘　　要：针对缺乏高精度机载运动测量系统情况下获得的某国产机载L波段合成孔径雷达(L-SAR)系统原始信号数据,采用完全数据驱动的基于相位梯度自动聚焦矫正信号相位的方法进行重聚焦成像处理试验.对点目标场景和分布目标场景的机载L-SAR信号数据成像处理试验表明:该成像方法能够有效地估计和补偿相位误差,从而获得方位向分辨率显著提高的机载L-SAR图像,是一种可以满足仅靠数据驱动实现高精度机载L-SAR成像处理的有效方法.For lack of high precision inertial measurement system, the L-band SAR system produced by the Institute of Electronics of Chinese Academy of Sciences was badly affected by random phase error induced by motion instability. To refocus these images under this particular condition, a fully data-driven imaging scheme based on phase gradient autofocus was tested. SAR imaging processing for different scene contents, including isolated point-object and distributed-object scenes, were performed to verify this refocusing scheme. The experiments show that the imaging scheme based on phase gradient autofocus can effectively measure and compensate the phase errors, thus obtaining obviously improved airborne L-SAR images in azimuth resolution. The processing results prove the effectiveness of this scheme for fully data-driven high-precision airborne L-SAR imaging.

关 键 词：机载雷达成像 相位误差 相位梯度自动聚焦 

分 类 号：TN958[电子电信—信号与信息处理]