Three dimensional integrated guidance and control for slide to turn missile with input saturation

To control a slide to turn (STT) missile which attacks a ground moving target in the presence of input saturation, a three dimensional (3D) integrated guidance and control (IGC) law based on dynamic surface control and linear extended state observer (LESO) techniques is developed. Firstly, a novel 3D IGC model is built without assuming that the angle between line of sight (LOS) and missile velocity is small or almost constant. Then, to analyze the effect of input saturation, a Nussbaum function, a smooth tangent function, and an auxiliary system are introduced. The modeling error, acceleration of target and aerodynamic parameters perturbation are viewed as the overall system uncertainty which three linear extended state observers are designed to estimate. With the signal generated by the auxiliary system and uncertainty estimated from LESO, a robust controller utilizing dynamic surface control technique is designed to track the target. Besides, the stability of system is proved. Simulation results demonstrate the effectiveness of the law.