基于分数阶Fourier变换的机载SAR运动目标检测  

THE AIRBORNE SAR MOVING TARGET DETECTION BASED ON FRACTIONAL FOURIER TRANSFORM

作　　者：孙泓波[1] 顾红[1] 苏卫民[1] 刘国岁[1] 

机构地区：[1]南京理工大学电子工程技术研究中心,南京210094

出　　处：《电子与信息学报》2002年第8期1060-1065,共6页Journal of Electronics & Information Technology

基　　金："雷达信号处理国防科技重点实验室基金"(No.99JS01.4.1.DZ2401)

摘　　要：该文首先建立了机载合成孔径雷达(SAR)对运动目标的回波信号模型,阐述了其本质为线性调频信号的特点。根据这种特点,提出了一种基于分数阶Fourier变换的机载SAR运动目标检测新方法,有效地消除了线性调频信号的时频耦合特性对信号检测的影响。与双线性时频分布类算法相比,分数阶Fourier变换是线性变换,在多运动目标存在的情况下,不会受到交叉项的影响。仿真结果验证了算法的有效性。In this paper, the signal model of airborne SAR moving target echo is constructed firstly, which is a chirp signal naturally. According to this feature, a new technique of SAR moving target detection based on fractional Fourier transform is proposed. The effects of coupling in time-frequency domain on signal detection are eliminated. Compared with the bilinear time-frequency distribution algorithms, the fractional Fourier transform is a linear operator, and it will not affected by the intercross terms when multiple moving targets exist. The simulation results validate the effectiveness of this technique.

关 键 词：机载SAR 分数阶FOURIER变换 合成孔径雷达 运动目标检测 线性调频信号 

分 类 号：TN959.73[电子电信—信号与信息处理] TN951[电子电信—信息与通信工程]