Guidance Law Design by Adaptive Fuzzy Sliding-Mode Control

Abstract

This paperproposes three fuzzy-logic-basedcommandsto line-of-sightguidance laws. Theprinciple of command to line-of-sight guidance is to force a missile to  y as close as possible along the instantaneous line of sight joining the ground tracker and the target. First, the fuzzy logic control and the fuzzy sliding-mode control guidance laws are presented. In addition, an adaptive fuzzy sliding-modecontrol designmethod is developed and is applied for the command to line-of-sight guidance law design. In the design of the adaptive fuzzy sliding-mode control guidance law, the adaptive laws based on a Lyapunov function are developed to adjust the parameters of the fuzzy rules and the uncertainty bound. Thus, the stability of the system can be guaranteed. Finally, two engagement scenarios are examined and a comparison between the proposed fuzzy logic control guidance law, fuzzy sliding-mode control guidancelaw,adaptivefuzzy sliding-modecontrolguidancelaw,andamodel-basedfeedback linearizationguidance law is made.