弹载调频连续波合成孔径雷达大斜视成像方法研究  

High squint imaging method for missile-borne FMCW SAR

作　　者：梁颖[1] 张群[1] 杨秋[1] 李治安[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：《电波科学学报》2014年第6期1115-1121,共7页Chinese Journal of Radio Science

基　　金：国家自然科学基金(No.61172169);中国博士后基金(2012M521897)

摘　　要：弹载调频连续波合成孔径雷达(Frequency Modulated Continuous Wave Synthetic Aperture Radar,FMCW SAR)在大斜视工作模式下,导弹的连续运动会在距离向产生多普勒频移,导致距离向频谱偏移及方位像散焦,高速运动及大斜视角还会引入一个二次相位误差,影响距离像的聚焦.通过推导分析弹载FMCW SAR大斜视回波信号的波数域表达式,提出一种弹载FMCW SAR大斜视成像方法,在二维波数域完成了多普勒频移校正、二次相位误差补偿和距离徙动校正,很好地改善了成像质量.仿真实验验证了理论分析结果及所提成像方法的有效性.In high squint operation mode for missile-borne frequency modulated continu- ous wave synthetic aperture radar （FMCW SAR）, the Doppler frequency shift is in- duced by the continuous motion of missile,which leads to the frequency shifting in the range direction and azimuth defocusing. A quadratic-phase error is also induced by the high speed of missile and the high squint angle, which effects the focusing of range pro- file. To solve these problems, a high squint imaging method for missile-borne FMCW SAR is proposed by analyzing the return signal expression in the wave number domain. The Doppler frequency shift, quadratic phase error and range migration are compensated in the two-dimension wave number domain, and then the imaging quality is well im- proved. Finally, some simulation results are given for validating the theoretical deriva- tion and the effectiveness of the proposed imaging method.

关 键 词：调频连续波合成孔径雷达 大斜视成像 多普勒频移 二次相位误差 波数域 

分 类 号：TN957[电子电信—信号与信息处理]