基于MGEKF的反辐射无人机末制导律设计

Design of Terminal Guidance Law for Anti-Radar UAV Based on Modified Gain Extended Kalman Filter[HS)]

摘要:

针对反辐射无人机攻击空中机动目标的特点,提出了一种利用MGEKF滤波算法估计无人机-目标接近速度信息的变结构导引律；该导引律利用变结构控制的干扰不变性特性,将目标机动看成是未知的有界干扰,实现了目标有界机动条件下视线角速度的零化；同时针对无人机和目标的接近速度信息不能直接测量的特点,对典型的目标运动模式进行运动状态估计；最后在无人机非线性六自由度仿真模型上仿真证明,其末制导精度优于传统广义比例导引律,且具有较好的工程应用前景。

Abstract:

In this paper, a terminal guidance law based on the MGEKF theory and variable structure control, which considered the target maneuverability and the relative velocity of the UAV-target, was designed for anti-radar UAV. Taking the idea of disturbance inflexibility of the variable structure control, the guidance law is designed and the rates of zeroing the LOS(line-of-sight) is realized, under the condition of taking the acceleration of target as a disturbance with boundary. Then, as the relative velocity of the UAV-target is immeasurable, the statement estimating of typical maneuvering model of target is presented. Finally, it is proved by simulation that the miss distance of the guidance law is better than the traditional PN law and the results validate its effectiveness.