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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。
There are many kinds of fretting in the space cone when flying, which can be divided into the nutation, precession and spin. Accurately obtaining the target fretting is the precondition of the trajectory target fretting and structural parameter estimation. Firstly, we analyzed the micro-Doppler and its spectral distribution characteristics of the cone-shaped and cone-shaped sliding-type scatter sources of three kinds of micro-cone-shaped lower cone and found that the micro-Doppler of the target scattering source of the cone is 0 Hz. The peak non-equidistant distribution of micro-Doppler spectrum of arbitrary scattering source and the equidistant distribution of micro-Doppler spectrum of arbitrary scattered source of precession cone target are obtained. According to this, the classification method of recognizing the nutations and precessions by using the identification of spin-waves by using the micro-Doppler threshold and using the equidistance distribution of the micro-Doppler peaks is proposed. Finally, the effectiveness of the classification method in this paper is illustrated through simulation, which can provide some references for the micro-motion classification of the cone.