大气层外末段拦截变结构制导律设计

Optimum Design of Variable Structure Guidance Law for Exoatmospheric Endgame Interception

研究拦截器大气层外拦截机动目标的末制导律设计问题。由沿空间拦截视线坐标系3个方向的相对运动方程,通过构建李亚普诺夫函数设计出了用于拦截目标存在两个方向不确定性机动的情况下的三维变结构制导律。以可用过载以及燃料消耗为约束,通过建立关于脱靶量的性能指标函数,将全局优化粒子群算法应用于拦截制导律优化问题。仿真结果表明,变结构制导律具有较好的制导精度和鲁棒性,通过对制导律参数优化有效减少了脱靶量,应用该方法得到的参数优于传统设计方法中基于经验选取的参数。

Terminal guidance design problem for exoatmospheric interceptor to intercept a maneuvering target is investigated. Relative kinetic functions are constructed in three directions of line of sight coordinates. A 3 D variable structure guidance law for intercepting a target maneuvering in two directions is proposed based on Lyapunov function. In order to realize the law＇s optimization, particle swarm algorithm is applied by choosing the performance index of the minimum miss distance under the moment and fuel restrictions. The guidance law was applied to the interception scenario in which target maneuvering exists. Simulation results showed that the guidance law has perfect guidance precision and good robustness. Particle swarm optimization can reduce miss distance effectively better than other traditional ways. and the law＇s parameters found by this method are