Guidance Law Based On The Exact End Of Fuzzy Logic

With the application of the new technology in military areas, terminal guidance laws are used in tactical missile to improve the guidance precision. Since the classical guidance laws cannot satisfy the more and more complicated interceptions and there has some difficulty to put the modern guidance laws in practice, it is urgent to search a new precision guidance law to change this situation.In this paper, using limited information, a new guidance law based on fuzzy logical is designed, which has intelligent effects under the situation that the target escapes with high acceleration. The main achievements are summarized as follows:1. On the base of detailed analysis of the classical guidance laws, a new combined guidance law is proposed, which consists of proportional navigation and fixed lead navigation. The process of deduction in math is given under the situation that the target escapes with high acceleration. The simulation results have verified the law's validity.2. Based on the fuzzy logic, a fuzzy combined guidance law (FCGL) is developed. Comparing with proportional navigation, the improvement is achieved on the rate of the line of sight, the missile's acceleration's overload and miss distance under many interceptions.3. A modified combined guidance law is advanced. Based on the fuzzy logic, a modified fuzzy combined guidance law (MFCGL) is designed. The simulation results show this improvement.4. A new neuro-fuzzy controller is introduced in which a fuzzy logic controller is interpreted as a three layered neural network. The weights optimized by neural network have direct meaning and any error can be distributed back among the control rules.5. FCGL and MFCGL is optimized by neural network, including the change samples and train off-line. The effects of this approach are conformed by simulation results.Therefore, the research results in this paper would be useful for precision guide weapons.