A Method of Feed-Forward Control Command Calculation Based on Unscented Kalman Filter

On the background of air defense missile guidance and control system design, this article focuses on the high speed and high maneuvering target strike problem. Line of sight angular velocity is used as the input of open loop feed-forward control system to improve the guidance precision of the weapon. Line of sight angular velocity is calculated from the line of sight angle which is measured by phased array radar. Since phased array radar has measurement noise, differential of line of sight angle may cause prodigious error and feed-forward command may not smooth. To avoid numerical differentiation, unscented Kalman filter is considered to calculate the line of sight angular velocity and the feed-forward command. The performance of the algorithm is demonstrated with simulated data by comparing with other traditional digital filter.