基于时频分析的微动弹道目标ISAR成像方法  

Ballistic Target ISAR Imaging Based on Time-Frequency Analysis

作　　者：龙戈农[1] 章捷 童宁宁[1] 冯存前[1] 牛超[1] 

机构地区：[1]空军工程大学防空反导学院 [2]94782部队

出　　处：《空军工程大学学报（自然科学版）》2015年第1期42-45,共4页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61372166)

摘　　要：为克服弹道目标在微动情况时,其散射点的多普勒频率会随微动而变化,最终影响弹道目标的成像质量问题,提出了利用abor变换进行时间选择成像的方法。通过时频分析的方法,在时频域上找寻多普勒频率近似于直线变化的时间段,并在此时间段中对目标进行成像。仿真结果表明:在目标存在微动情况下,选择多普勒频率近似为直线的时间区间进行成像,能有效地聚集ISAR成像,仿真分析验证了该方法的有效性。When ballistic target is moving with micro-motion, the Doppler frequency of its scattering points will be modulated by micro-motion which will have negative effect on imaging. In this article, a new method called time selection imaging based on abor transformation formula is put forward, which will focus image effectively. The proposed method seerches the Ddoppler fraguency in time quantum of syraight line approximation in time-frequency domain for the target And the effectiveness of this method is verifies by simulation.

关 键 词：弹道目标 逆合成孔径雷达 微动 成像 

分 类 号：TN95[电子电信—信号与信息处理]