The Research Of Missile Precision Terminal Guidance Law Based On Fuzzy Logic

Missile guidance and control system is a multi-variable, non-linear, time-varying easily affected by environmental, and complexity control system. In recent years, with various aircraft to enhance the maneuverability and speed, the task of missile guidance system has become increasingly 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. While fuzzy guidance law with robust, intelligent, is great concerned.First, this paper analyzes the missile guidance loop, and establish guidance law simulation model. Since then the traditional homing guidance law was introduced, as well as the theoretical analysis of the miss distance caused by blind spots. Combined fuzzy proportional guidance design parameter arbitrary, this paper applies the PSO algorithm optimization of the design parameters offline methods to optimize in the fuzzy membership function based on performance indicators. Simulation results show that this method can simplify the process of fuzzy design parameter optimization problem Optimization of fuzzy guidance in the precision guidance, and control energy consumption aspect has also been enhanced.Next, since LOS rate is divergence while proportional navigation guidance (PNG) intercept maneuver target at last. An analytical description of the adaptive fuzzy homing guidance law is proposed. The paper According the principle of parallel nearly equaling guidance to the general issue of error control, serves the output instructions of PNG as control error, and the it's rate as two inputs design two-dimensional fuzzy adaptive controller, export the normal acceleration of missile. Simulation results show that the guidance law is of better ballistic characteristics and smaller miss distance (MD), and have ability to intercept target with great maneuver. The guidance law right to intercept moving targets is of a highly adaptive and a kind precision guided law with practical value.Finally, we established 3D model of missile-target pursuit, and proposed a self-adaptive fuzzy guidance law based on augmented proportion navigation (APN). As the APN is a simply form of optimal guidance law theoretically, so combined it with fuzzy logic can perform better interception for maneuver targets, and overcome the effect of the blind spot on guidance accuracy. The interception simulations of two-dimensional and three-dimensional space show the guidance law is of higher accuracy, shorter time-to-go and less control energy consuming than that of PNG, and is a guidance law with significant superiority.