The Improving Of Proportional Navigation Law Based On Multi-Step Estimating

With the rapid development of modern military science and technology, future war mode and tactics has undergone tremendous changes. Missiles with long-distance attack capability will play an increasingly important role in future war. So, Missile interception is an indispensable technology in the future, scholars in different countries have made great achievements in this. Based on these achievements, this paper is mainly about the guidance law of the interception.By examining the classic proportional guidance law, widely applied in current homing guidance missile, a lot of factors, including initial navigation deviation, longitudinal acceleration and gravity of missile and target maneuver acceleration, which affect the angular speed of the Line-Of-Sight(LOS), are found in traditional proportional guidance law. These interference go against the interception for maneuvering target. Since the classical proportional navigation is not propitious to the interception of the maneuvering target, an advanced proportional navigation is designed with the LOS angular acceleration added in. In order to eliminate jerking motion of normal overload, based on generalized kalman filter multi-step estimation, this article puts also forward a new guidance mode which guide the missile directly to the predictive impact point at terminal guidance section.Simulation is carried out for the theory put forward by this paper and the simulation results demonstrate that the guidance scheme can promot the hitting accuracy, reduce the intercepting time and decrease or eliminate the flop of missile normal overload near the collision point. So it is effective to intercept maneuvering target.