步进调频SAR子带误差估计新方法  

Novel error estimation method for stepped frequency chirp SAR

作　　者：吴明宇[1] 杨桃丽[1] 吴顺君[1] 李真芳[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2014年第4期41-46,70,共7页Journal of Xidian University

基　　金：国家自然科学基金资助项目(41001282;40871205)

摘　　要：针对步进频线性调频信号合成大带宽信号时各子带间的不一致性,提出了一种子带误差估计方法.该方法通过对相邻子带间的重叠谱相位差进行拟合,得到子带幅相误差和延时误差.同时还提出对各子带回波进行加窗处理以消除因子带重叠引起的成对回波.仿真数据和地基实测数据实验验证了文中方法的有效性.To reconstruct the spectrum of a wide band signal by stepped-frequency chirp signals,the mismatch between sub-band signals should be compensated,a novel method is proposed in this paper to estimate the sub-band errors depending on the overlap spectra between sub-band signals, with the amplitude-phase error and the time delay error between sub-band signals estimated by fitting the interferometric phase of the overlap spectra components.Besides,the window for eliminating the ghost images caused by the overlap spectra is proposed.Finally,the computer simulation and the ground-based real data confirm the validity of the method.

关 键 词：合成孔径雷达 距离高分辨 步进频 子带误差 

分 类 号：TN957[电子电信—信号与信息处理]