变论域模糊自适应滑模有限时间收敛制导律

针对拦截高速机动目标的需求,研究了一种变论域模糊自适应滑模有限时间收敛制导律。推导了导弹-目标空间拦截模型,设计了三维滑模制导律;根据有限时间收敛制导律专家的经验,采用模糊自适应控制方法对滑模制导律的非切换项进行逼近,并设计了有限时间收敛模糊控制规则;提出了一种新型变论域伸缩因子,设计了基于新型伸缩因子的变论域模糊自适应滑模有限时间收敛制导律。仿真结果表明,所设计的制导律能够使导弹准确命中目标,并能够达到视线角速率有限时间收敛,且与比例制导律相比,具有更高的制导精度和更短的飞行时间。

Variable Universe Fuzzy Adaptive Sliding Mode Guidance Law with Finite Time Convergence

A finite time convergent guidance law based on variable universe fuzzy adaptive sliding mode is proposed for intercepting high speed and maneuvering targets. Firstly, the missile-target interception model is derived and the three-dimensional sliding mode guidance law is designed. Secondly, according to the expert experience of finite time convergent guidance laws, the fuzzy adaptive control method is adopted to approximate the consecutive items of the sliding mode guidance law, and the finite time convergent control rules are designed. Finally, a new expansion factor for variable universe is proposed and the variable universe fuzzy adaptive sliding mode guidance law with finite time convergence based on new expansion factor is proposed. Simulation results show that the proposed guidance law could hit the target correctly and achieve the finite time convergence ability of the line-of-sight, besides, compared with the proportional navigation guidance law, the proposed guidance law has better guidance precision and shorter flight time.