攻击机动目标的被动寻的模糊变结构制导律研究

Research on fuzzy variable structure guidance law for passive homing missiles against maneuvering targets

针对目标机动且仅有视线角速度测量的被动寻的制导问题,提出了被动寻的模糊变结构制导律。该制导律将目标机动视为干扰量,首先应用滑模变结构控制理论推导出滑模变结构制导律,然后采用模糊控制技术,根据目标加速度估计值来自动选取制导律开关项的强度,以达到削弱抖振的目的。在工程实现时,采用制导指令低通滤波的方法实现对弹体攻角和侧滑角的估计。将该制导律应用于电视制导航弹的数学仿真,并与滑模变结构制导律、比例导引制导律进行了比较。仿真结果表明,该制导律攻击机动目标的脱靶量较小,对估计误差具有较强的鲁棒性。

A fuzzy variable structure guidance law is proposed for the passive homing guidance in which only LOS angular rate can be measured when a target maneuvers. The proposed guidance law is based on the sliding-mode variable structure guidance law which regards the target maneuvering as interference. In order to reduce chattering, it selects the gain of the switching term according to the target maneuver estimation by means of fuzzy control. When the guidance law is implemented, the angle-of-attack is estimated by the method that the guidance command passes through a low-pass filter. At last, the proposed guidance law is applied to the computer simulation of the video-guided bomb, and compared with traditional proportional navigation and sliding-mode variable structure guidance law. The simulation results show that the proposed guidance law against a maneuvering target has stronger robustness to estimation errors and smaller miss distance than the others.