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针对用线极化天线测速雷达测量弹丸飞行姿态问题,利用电磁理论推导并分析了底部刻槽弹丸的姿态特征参数。首先由雷达电轴与刻槽弹丸对称轴之间的关系,建立弹体散射矩阵,得到散射场的粗略表示,说明刻槽测量姿态的原理;其次,利用理想导体上无限长窄槽的表面等效磁流的近似表达式,详细推导了凹槽散射的远场表达式;再次,比较了刻槽后平行极化与垂直极化的远区散射场,用解析法和数值法仿真了不同飞行姿态下刻槽对弹丸散射回波的调制作用并与实测数据进行了比较,数值仿真了姿态特征参数的单调性;最后,对姿态特征参数的增强方法进行了简要的讨论和展望。仿真结果表明,在一定章动角范围内,该姿态特征参数能够表征弹丸的飞行姿态,具有相对稳健性和单调性。
Aiming at the problem of projectile flight attitude measurement with linearly polarized antenna velocity radar, the attitude characteristic parameters of the bottom notch projectile are deduced and analyzed by electromagnetic theory. Firstly, the relation between the radar axis and the symmetry axis of the slotted projectile is established, and then the projectile scattering matrix is established to obtain the rough representation of the scattering field, which shows the principle of the groove measurement attitude. Secondly, by using the ideal conductor on the surface of infinite slot The approximate expression of effective magnetic flux is deduced, the far-field expression of groove scattering is deduced in detail. Thirdly, the far-field scattering field of parallel polarization and vertical polarization after notch groove is compared, and the different flight The effect of slot on the modulation of shot scatter echo is compared with the measured data, and the monotonicity of the pose feature parameters is numerically simulated. Finally, the enhancement of the pose feature parameters is briefly discussed and prospected. The simulation results show that the attitude characteristic parameter can characterize the projectile flight attitude within a certain range of nutation angle, which is relatively robust and monotonic.