高分辨SAR成像线性调频信号脉冲压缩补偿方法  

Eerror compensation for pulse compression of LFM signal in high resolution SAR imaging

作　　者：陈凯[1] 孙龙[1] 江凯[1] CHEN Kai;SUN Long;JIANG Kai(No.38 Research Institute,China Electronic Technology Group Corporation,Hefei 230088,China)

机构地区：[1]中国电子科技集团公司第38研究所

出　　处：《空军预警学院学报》2019年第5期345-348,共4页Journal of Air Force Early Warning Academy

摘　　要：为解决工程上高分辨合成孔径雷达(SAR)成像存在强目标旁瓣较高、分辨率不够、信噪比较差等表观质量问题,分析了SAR信号处理中线性调频脉冲压缩的时频特性,指出了制约高分辨SAR成像性能的宽带调频信号脉冲压缩的因素;对照SAR系统工作流程,详细讨论了目前工程上解决方案存在的问题,提出了基于相位误差的多项式拟合补偿方法,并对脉冲压缩效果进行了定量分析;最后在SAR成像表观质量改善上进行了工程验证.In order to solve the common appearance quality problems of SAR imaging in engineering,such as high sidelobes of strong targets,low resolution,poor signal-to-noise ratio and so on,this paper analyses the time-frequency characteristics of LFM pulse compression in SAR signal processing and points out the factors that restricts the wideband LFM signal pulse compression of high resolution SAR imaging performance.Then the paper compares with the working process of SAR system,detailedly discusses the problems existing in the current engineering solutions,and puts forward a polynomial fitting compensation method based on phase error,quantitatively analyzing the effect evaluation of pulse compression.Finally,the improvement of SAR image apparent quality is verified through engineering.

关 键 词：高分辨SAR 宽带线性调频信号 脉冲压缩 相位误差补偿 

分 类 号：TN959.12[电子电信—信号与信息处理] TN958[电子电信—信息与通信工程]