进动锥体目标平动补偿及微多普勒提取  

Translation compensation and micro-Doppler extraction of the precessional cone target

作　　者：束长勇 黄沛霖[1] 姬金祖[1] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191

出　　处：《系统工程与电子技术》2016年第2期259-264,共6页Systems Engineering and Electronics

基　　金：国家自然科学基金青年基金(51307004)资助课题

摘　　要：针对平动调制下的进动锥体锥顶及锥底滑动型散射源微多普勒提取问题,提出一种利用微多普勒曲线交叉点频移信息完成平动补偿并利用正交匹配追踪(orthogonal matching pursuit,OMP)提取微多普勒的方法。根据进动锥体散射源微多普勒变化规律建立回波模型,引入二次型平动速度调制项,发现微多普勒曲线交叉点处的瞬时频移是由剩余平动引起的。利用Harris-Laplace角点检测获取时频图中微多普勒曲线交叉点信息,通过最小二乘参数辨识得到剩余平动参数;针对平动补偿后锥体散射源微动特性构建回波信号原子集,利用OMP稀疏分解提取各散射源的微动信息。仿真验证了所提方法的有效性。In order to extract the micro-Doppler of conic nodes and slip-type cone bottom scattering sources modulated by the translation, a method is proposed which compensates the translation by the instantaneous fre- quency of the cross-point among the micro-Doppler curves, and extracts the micro-Doppler of conic node and slip-type cone bottom scattering sources by orhtogonal matching pursuit （OMP）. The scattering model is estab- lished by the micro-doppler characteristics of the conic nodes and slip-type cone bottom scattering sources of the processional cone-target, and the quadratic form velocity modulation is brought in, the analysis finds that the mi- cro-Doppler of the cross point in time-frequency distribution is induced by the remaining translation. The Doppler of the cross point is extracted by the Harris-Laplace corner detection method, the translation parameter is estimated by the least square method and the translation is compensated. The atomic set, which is used to ex- tract the signal of different scattering sources, is built according to the echo signal compensated by remaining translation. Finally, the simulation results show that the proposed algorithm is effective.

关 键 词：进动锥体目标 滑动型强散射源 HARRIS-LAPLACE 正交匹配追踪 平动补偿 微多普勒 

分 类 号：TN957[电子电信—信号与信息处理]