变质心再入弹头螺旋机动突防弹道设计

Spiral maneuver penetration trajectory for moving-mass reentry warhead

为提高高超声速变质心再入弹头的突防能力,设计了一种基于主动螺旋机动的突防弹道。在建立变质心弹头动力学模型和弹目运动学模型的基础上,引入新的控制变量,通过控制质量块的偏移位置,将速度矢量和弹目连线的夹角控制在固定值并且使速度矢量绕弹目连线以一定转速旋转来实现螺旋机动。在实现螺旋机动的基础上,推导了弹体处于螺旋机动状态下的螺旋机动半径和稳态脱靶量均方根的解析解。六自由度弹道仿真表明,所设计的突防方案使再入弹头能够进行有效的螺旋机动,通过合理控制机动幅度大小,可以在实现螺旋机动突防的同时保证较高的命中精度。

To improve the penetrability of moving-mass reentry warhead,an actively spiral maneuver trajectory is proposed.Dynamics model and missile-target kinematics model are established and analyzed by introducinga new variable and controlling the lateral position of moving-mass;the angle between the velocity vector and the line of sight vector is controlled at a desired value.Based on the above analysis,analytical solutions of spiral maneuver radius and root-mean-square miss distance are derived.Six-dimensional trajectory simulations demonstrate that the proposed approach is capable of achieving spiral maneuver.By adjusting the value of maneuver margin,the spiral maneuver and high precision can be achieved at the same time.