旋转稳定二维弹道修正弹落点预测制导方法研究

Study of an Impact Point Prediction Guidance Method for Spin-stabilized 2D Trajectory Correction Projectiles

针对旋转稳定二维弹道修正弹的落点预测制导方法设计问题,提出了一种通过两次落点预测修正一次弹道的制导方案。研究了固定舵产生阶跃激励时弹丸的攻角、速度方向及落点运动规律,得出了落点修正量的相位角较固定舵滚转角超前一个前置角。提出了通过两次落点预测获得修正落点偏差所需的固定舵滚转角的方法:第1次无控落点预测得到目标点与实际落点的偏差方位角,第2次有控落点预测得到落点修正量的相位角相对于固定舵滚转角的前置角。仿真结果表明,落点预测制导具有较好的落点修正效果。研究结果对该类弹丸的制导方法设计提供了参考。

In view of the design problem of impact point prediction guidance method for the spinstabilized 2D trajectory correction projectiles,a guidance scheme was proposed to correct the first trajectory through two predictions of impact points.The motion laws of the attack angle,the velocity direction and the impact point were studied when the fixed rudder generated step excitation.And it is concluded that the phase angle of impact point correction has a lead angle ahead of the roll angle of fixed rudder.The method of obtaining the roll angle of fixed rudder required to correct the error of impact point by two impact point predications was proposed.The azimuth angle of the error between the target and the actual impact point was obtained by the first uncontrolled impact point prediction.And the lead angle of the phase angle of impact point correction relative to the roll angle of fixed canards was obtained by the second controlled impact point prediction.The simulation results show that impact point predication guidance method has a high accuracy and the results provide some references for the design of the guidance method of such projectiles.