进动锥体目标平动补偿及微多普勒提取

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。

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

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 frequency 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 established 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 micro-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 extract 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.