Integrated missile guidance and control three-channel decoupling design method

Based on extended state observer (ESO) and backstepping-sliding mode design method, a novel integrated guidance and control three-channel decoupling design approach is proposed for the problem that a homing missile attacks ground target during diving phase. The fully integrated guidance and control model is established by combining guidance and control system in addition to considering interaction between three channels in control system. ESOs are adopted to estimate and compensate dynamic coupling terms and uncertainties currently in six degrees of freedom (6DOF) system, which realizes the active decoupling between each channel in the system, thereby generating three-channel decoupling control law for integrated missile guidance and control based on ESO. Meanwhile, in order to solve the problem that high order nonlinear system can cause “computation explosion” according to using ESO to measure state values, the adaptive control law is employed to afford redress for observation error in ESO. It is demonstrated that all states in the closed loop system are ultimately bounded on account of Lyapunov stability theorem. Compared with three-channel independent design method for integrated system and traditional guidance and control system design method, the simulation results verify the advantages and practicalities of the integrated guidance and control decoupling design algorithm based on ESO.