基于ENCS的FMCW SAR俯冲聚束成像方法  

Diving-spotlight imaging method for missile-borne FMCW SAR based on ENCS algorithm

作　　者：梁颖[1] 张群[1] 杨秋[1] 孙莉[1] 

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077

出　　处：《华中科技大学学报（自然科学版）》2015年第8期43-46,57,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61172169);中国博士后科学基金资助项目(2012M521897)

摘　　要：针对弹载调频连续波合成孔径雷达FMCW SAR俯冲聚束成像的特点,通过构造全时间距离走动校正函数,完成了距离走动校正;采用谱分析的方法进行方位多普勒解模糊处理,消除方位向频谱混叠;在方位向处理中,提出一种改进的非线性调频变标算法,补偿方位空变相位误差,实现了方位向的精确聚焦.点目标仿真实验验证了理论分析与所提成像方法的有效性.According to the character of diving‐spotlight imaging for missile‐borne FMCW SAR （fre‐quency modulated continuous wave synthetic aperture radar） ,the range walk iwas corrected by the construction of all time range walk correction function .The SPECtral analysis （SPECAN） was in‐duced to remove the azimuth spectral folding .In the azimuth processing ,an extended nonlinear chirp scaling （ENCS） algorithm was proposed .The azimuth‐variance phase error was compensated ,and a high precise azimuth imaging was achieved .Finally ,some imaging simulations of point targets were given for validating the theoretical derivation and the effectiveness of the proposed imaging method .

关 键 词：合成孔径雷达 调频连续波 弹载 俯冲聚束 谱分析 非线性调频变标 

分 类 号：TN957[电子电信—信号与信息处理]