用于被动寻的导弹的带末端落角约束的变结构导引律

使被动寻的导弹在较低的平飞弹道情况下，以较小的俯冲过载和最佳攻击姿态精确命中目标；采用带落角约束的变结构导引律，对弹目距离及距离变化率进行估计，克服被动寻的导弹不能测距的约束，同时使切换开关增益随时间自适应变化以减小俯冲过载；利用某型在研被动寻的导弹的气动参数，对此变结构导引律进行了数学仿真，仿真结果表明，在较低的平飞弹道约束条件下及过载要求范围内，该导引律能以期望落角命中静止与机动的坦克目标，对弹目距离变化率及距离的较大估计误差具有较强的鲁棒性。

Passive Homing Missile''''s Variable Structure Proportional Navigation with Terminal Angular Constraint

The objective is to design a variable structure proportional navigation law for the passive homing missile so that the missile can hit the target with a minimum miss-distance and desired impact attitude angle within the required overload when it flies at a lower trajectory. This paper utilized the variable structure proportional navigation with terminal impact attitude angular constraint, and made estimation about the distance rate and distance between the missile and target, which broke the limitation of a passive homing seeker. Furthermore, the paper let the switch gain vary adaptively with time to avoid any larger initial overload. The mathematical simulation was completed by some studied passive homing missile's dynamic model, and the simulation results showed that the navigation law of the passive homing missile can make the missile get the required miss-distance and desired impact attitude angle against tanks at lower trajectories and within the maximum overload; also this guidance law is much robust to the estimation error of distance and distance rate.