一种基于速度方向修正的旋转稳定弹弹道跟踪制导方法研究

针对旋转稳定二维弹道修正弹的制导律设计问题,提出了一种基于速度方向修正的弹道跟踪制导方法,推导了固定舵产生阶跃激励时弹丸的攻角及速度运动规律,得到了平均偏角的相位角与固定舵滚转角的关系。通过在标准弹道上生成一个虚拟未来点,得到了速度角的指令。提出了通过修正速度方向与该指令的偏差,实现对标准弹道跟踪的原理。提出了一种当实际弹道偏离标准弹道较远时,通过落点预测实时生成新的标准弹道的方法。仿真结果表明:小射角射击时,可在全弹道采用速度方向修正来跟踪标准弹道;大射角射击时,可在降弧段在线生成标准弹道,再通过速度方向修正来跟踪该标准弹道。

Study on Trajectory Tracking Guidance Method for Spin Stabilized Projectile Based on Velocity Direction Correction

A trajectory tracking guidance method based on velocity direction correction was proposed for the design of guidance law of spin stabilized 2D trajectory correction projectile(TCP). The laws of attack angle motion and velocity motion while the fixed canards generated step excitation were derived,and the relationships between the phase angle of average deflection angle and the roll angle of fixed canards were obtained. By generating a virtual future point on the standard trajectory, the commands of the velocity angles were obtained. The principle was proposed by correcting errors between the velocity direction and the commands,and the tracking of standard trajectory was achieved. A new standard trajectory can be generated in real time through the impact point prediction while the actual trajectory is far away from the standard trajectory. The simulation results show that,when the firing angle is small,the velocity direction correction can be used to track the standard trajectory on the whole trajectory. When the firing angle is large, the standard trajectory can be generated on downward phase, and then the velocity direction correction can be used to track the new standard trajectory.