The Relation Between Fuzzy Logic Guidance Law And Homing Quality

The missile guidance and control system is a multi-variable, non-linear, time-varying and complex control system which is easily affected by environment. In recent years, various targets have enhanced their maneuverability and speed, especially the TBM. The task of missile guidance system has become more and more complicated. Traditional homing guidance law can not meet the increasingly strict interception requirements, especially for target with great maneuver. New guidance law has become a hot spot of military technology. For fuzzy and variable-structure control guidance law has robustness and intelligence,so they are great concerned.This paper establishes a three-dimensional model of the missile and target's motion which is idealized. Then traditional terminal guidance laws are used in the studies of simulation. Then, the model which is established in the background of direct force control interceptor, can disclose the non-linear, strongly coupled motional relation between the high speed, maneuverable target and the missile.In the past studies, the dynamic property of body is often ignored. But in the intercept situation of great maneuverable targets, the dynamic property will cause the deterioration of homing qualities. So, a design method of variable structure guidance law which considers the dynamic property is given. It has perfect effect on theory but it is hard to be used in engineering.Consider the information which the seeker can obtain and the operating mode of the engine, a fuzzy logic guidance law which based on proportional navigation and variable structure control. For some information is very hard to obtain in practice, so, a fuzzy logic which deals with the variable structure item is designed. This guidance law can adapt various maneuver style of the target.Finally, the results of simulation display that fuzzy logic guidance law is superior to pure proportional navigation and variable structure guidance law.