机载SAR相位误差补偿算法及实现  

Algorithm and implementation of phase error compensation for airborne SAR

作　　者：姜义成[1] 张璘[1] 

机构地区：[1]哈尔滨工业大学电子工程技术研究所,哈尔滨150001

出　　处：《哈尔滨工业大学学报》2007年第5期749-752,共4页Journal of Harbin Institute of Technology

基　　金：教育部博士点基金资助项目(20060213009)

摘　　要：结合多普勒参数和PGA自聚焦算法,提出了逐步补偿相位误差的方法.多普勒参数估计能够有效去除载机运动不理想所引入的相位误差,主要包括线性相位误差和二次相位误差.PGA算法能够很好地补偿电磁波传输过程中媒质不均匀等原因造成的相位三次及以上误差,两者相结合可以有效地补偿SAR成像中所存在的相位误差,从而实现高精度成像.实测数据分析验证了该方法的有效性,完成宽幅实测数据成像,并对成像结果进行理论分析,得出成像的实际物理过程及刻画成像区域范围的影响因素.Based on Doppler parameter estimation and Phase Gradient Autofocus algorithm, a method of gradually compensating phase error is presented. Doppler parameter estimation algorithm can be capable of removing linear phase error and quadratic phase error produced by movement error of Airborne which mostly decide imaging quality. PGA algorithm can compensate cubic phase error and high-degree error caused by media disproportionation of electromagnetic transmission. Combining two methods can effectively compensate phase error in SAR imaging and achieve high resolution-accuracy imaging. This paper utilizes measured data to accomplish wide-range imaging and verifies the algorithm. Finally by theoretical analysis for imaging effect, imaging actual physical process and affecting factors which depict imaging area coverage are derived.

关 键 词：机载SAR成像 相位误差补偿 多普勒参数 自聚焦 

分 类 号：TN957[电子电信—信号与信息处理]