基于相位函数的ISAR目标转角估计方法  

ISAR target's rotation angle estimation based on phase function

作　　者：严莹[1] 王琼[1] 柏业超[1] 张兴敢[1] 

机构地区：[1]南京大学电子科学与工程学院,南京210023

出　　处：《电子测量技术》2015年第2期42-46,共5页Electronic Measurement Technology

基　　金：江苏省产学研前瞻性联合研究(BY2012187)项目

摘　　要：逆合成孔径雷达(ISAR)二维像经过正确定标,能够获取目标的形状和尺寸等二维信息。ISAR二维像的径向距离分辨率由雷达带宽决定,横向距离分辨率由雷达工作波长和目标转角的比值决定。根据目标转角与回波相位之间的关系,计算回波的相位差导数估计转角。该方法选择信号幅度较强的距离单元,对回波信号进行相位解缠,根据距离单元的相位差导数估计目标的转速,计算方位向距离分辨率,实现定标。仿真结果表明,该方法可以对ISAR二维像尺寸进行定标。Inverse Synthetic Aperture Radar plays an important role in target recognition.We can obtain accurate information of target after scaling of ISAR image.The range resolution is determined by radar parameters,and the cross resolution is determined by the ratio of radar wavelength and rotation angle.The estimation of rotation angle is the key of cross scaling.In this paper,a method based on derivative of phase difference of two prominent scatters is proposed.After two high-amplitude prominent scatters are selected,the target RV can be estimated based on the difference of the two phase slopes.It has high computational efficiency and good performance at low SNR conditions,which is suitable for real data processing.Test on real data proves validity of the novel method.

关 键 词：ISAR雷达 横向距离定标 相位差导数 转角估计 

分 类 号：TP2[自动化与计算机技术—检测技术与自动化装置]