Spiral maneuver penetration trajectory for moving-mass reentry warhead

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.