基于极化特征的旋转弹丸飞行姿态测量方法研究

摘要

火炮弹丸的体积小、过载高、速度快,测量其飞行姿态难度大,针对此问题,提出了一种利用测速雷达实现旋转弹丸飞行姿态测量的方法.该方法通过在弹丸底部刻槽使其回波具备比较明显的线极化特性,以回波调幅指数表示弹丸飞行姿态.根据底部刻槽弹丸的表面结构,通过数值计算建立姿态角与调幅指数的对应关系,从射击试验弹丸的回波中处理出调幅指数,进而构建姿态角方程,辅以弹丸角运动规律解算出弹丸的飞行姿态.仿真分析表明,该方法是有效的.%The attitude of projectile with small volume, huge overload and high speed is difficult to measure. Aiming at this problem,a method adopting Doppler radar was proposed to measure the attitude of spin-stabilized projectile. By slotting grooves at the base, the projectile presented linear polarization scattering characteristics distinctly. The index of amplitude modulation was used to represent the attitude. The relationship between attitude of projectile and the index of amplitude modulation was established through numerical calculation according to geometric structures. The index can be extracted from echo of projectile in shooting range. Thus an equation about the index was established. Assisted with the motion property of projectile, the attitude of the slotted projectile was salved. The simulation analysis shows that the method is effective.