Improving variable structure guidance law to make it effective against highly maneuvering target

Zhou et al in Ref.3 proposed an adaptive variable structure guidance law. In our opinion, it needs to be improved by using fuzzy control theory. Section 1 of the full paper discusses the factors that change continuously the angular velocity of the line of sight. Section 2 explains how we improve the adaptive variable structure guidance law in Ref.3; the result is that we add to it a term to compensate for the target maneuvers, this additional term being given by eq.(20) at the end of section 2. Section 3 designs this additional term by using fuzzy control theory. The simulation results, given in Fig.5 and Table 1 of the full paper, show preliminarily that our improved variable structure guidance law does suppress greatly the miss distance.