基于滑模控制的非线性追踪导引律仿真设计

基于非线性追踪动力学模型,对追踪器和目标作一般机动(速度大小和方向都可变化)追踪过程进行研究。视目标机动为不确定摄动,分别考虑追踪视线径向和法向两个滑动面,应用变结构控制理论,并采用递减边界层的方法削弱滑模抖动,设计的非线性导引律,只需知道目标的最大机动限幅值,而不用对目标的逃逸机动进行即时估计与测量。仿真研究表明,该导引律具有克服目标机动的鲁棒性,可有效地追踪机动目标,包括随机机动目标。就追踪时间和控制消耗而言,其性能比比例导引律更优。

Simulation design of nonlinear pursuit-guidance law based on sliding-mode control

Based on nonlinear dynamic model with the target maneuver viewed as uncertain perturbation, a nonlinear guidance law is proposed by using variable control theory. Here, the general pursuit-evasion situation is considered, both their flight speeds and directions can be regulated. Two slid surfaces, radial and tangential, are designed, and the decreasing boundary-layer scheme is used to eliminate the chattering. It uses only the information for the target maneuver acceleration bound, without needing to estimate and measure the target evasion maneuver in real time. Simulation studies show that the proposed guidance law is robust and effective to pursuit the maneuver target including random maneuver scenario, in view of the capture time and the consumption of control cost, the proposed law is superior to other guidance laws.