基于微多普勒的空间锥体目标微动分类

空间锥体目标在飞行时存在多种微动,具体可分为章动、进动及自旋,准确获取目标微动形式是弹道目标微动及结构参数估算的前提。首先分析了3种微动形式下锥体目标锥顶及锥底滑动型散射源微多普勒及其频谱分布特性,发现自旋锥体目标散射源微多普勒为0 Hz,章动锥体目标任意散射源微多普勒谱的峰值非等间距分布,进动锥体目标任意散射源微多普勒谱的峰值等间距分布。据此提出利用微多普勒阈值识别自旋、利用微多普勒谱峰值是否等间距分布识别章动和进动的分类方法。最后通过仿真说明了本文分类方法的有效性,可为空间锥体目标微动分类提供一定的参考。

Micro-motion classification of spatial cone target based on micro-Doppler

There are many kinds of micro-motion in the spatial cone target in flight,which can be divided into nutation,precession and spinning.Accurate acquisition of the target's micro-motion form is the premise for the estimation of the micro-motion and the structural parameters of the ballistic target.First,the microDoppler distribution characteristics and the spectrum distribution characteristics of the cone target's cone node and cone bottom slip-type scattering source under the three micro-motions are analyzed,and it is found out that the micro-Doppler of spinning cone target's scattering source is 0 Hz,the micro-Doppler spectrum's peak value of nutation cone target's arbitrary scattering source is non-equidistantly distributed,and the microDoppler spectrum's peak value of precession cone target's arbitrary scattering source is equidistantly distributed.Base on this,the paper proposes the classification method,which recognizes the spinning cone target by the threshold of micro-Doppler and recognizes the nutation or precession cone target by judging whether microDoppler spectrum's peak value is equidistantly distributed or non-equidistantly distributed.Finally,the validity of the classification method is illustrated by simulation,which can provide reference for the micro-motion classification of spatial cone target.