A Comprehensive Approach to Develop a Continuous Fuzzy Guidance Law for Maneuvering Targets

Based on the idea of Continuous Fuzzy Guidance Law (CFGL), a andldquo;three-phase fuzzy guidanceandrdquo; (TFG) law is proposed for the class of surface to air homing missiles. The current approach enables the guidance law to track a maneuvering target from the beginning of the launch phase up to the terminal one while itdynamically attempts to keep miss-distance, flight time and control effort at a minimum acceptable level. The guidance law developed heredepends on four factors:line-of-sight (LOS) angle, LOS rate, LOS angular acceleration, and relative distance to the target. To show the relative superiority of the approach, the performance of the new guidance law has been compared with that of proportional navigation guidance. The results confirm the validity of the idea; as for a TFG,we get quite comparable results. The current approach also shows a relatively good robustness for a wide variety of flight conditions.