Fuzzy-Logic Based High Performance Fusion Guidance

As one kind of the most important weapons, the missile has become indispensable in modern battlefield. The core tasks of a missile guidance system are disturbance attenuation and high accuracy in hitting the target. Modern high-technology wars require more missile capabilities. Accuracy guidance plays vital roles in the improvement of the missile guidance properties.The classical guidance laws are widely used in many types of missile guidance systems. But they can't meet the demands of the modern complex control systems. The modern guidance laws have better performance, yet need high load-factor requirements and complexity. With rapid development, the intelligent technologies have been intensively applied in the practical engineering. The fuzzy logic, which is based on operation experiences and knowledge of human beings, can solve the control problems of the nonlinear systems with uncertainties. The dissertation presents a fusion guidance approach combining the traditional proportional navigation and the fuzzy guidance. Fuzzy-logic based guidance is a proportional navigation with effectiveness navigation ratio adjusted with fuzzy logic using measured LOS rate and closing speed as inputs. The fusion unit combines the proportional navigation and fuzzy-logic based guidance commands together to give the final guidance command through weighted-fusion method. The guidance performance is compared with proportional navigation. The results demonstrate that the new guidance law is of high guidance precision.