Adaptive Decoupling Control for Three-Channel Autopilot of Guided Rockets

Under severe flight conditions such as high Mach number and large angle of attack, the aerodynamic environment of guided rockets exhibits highly nonlinear and strongly coupled characteristics. Significant dynamic coupling effects exist among the pitch, yaw, and roll channels, and aerodynamic parameters are subject to considerable uncertainties due to shocks, flow separation, and other factors. These issues collectively pose serious challenges to traditional control design methods based on linearized models. To address these challenges, this paper proposes a variable-gain adaptive decoupling control method. First, based on the classical feedforward decoupling concept, a decoupling controller is designed to preliminarily suppress inter-channel coupling effects. To further cope with aerodynamic parameter perturbations and model uncertainties, a model reference adaptive control framework is introduced, and an online parameter compensation mechanism is constructed to adjust controller parameters in real time according to changes in the aerodynamic environment. Additionally, by defining and estimating a system coupling degree in real time, a variable-gain adaptive law based on coupling degree is designed. This allows the decoupling effort to be dynamically adjusted according to the coupling degree, ensuring effective decoupling while avoiding performance degradation due to over-compensation. Simulation experiments conducted under typical high-dynamic flight scenarios demonstrate that, compared to traditional methods, the proposed approach effectively suppresses inter-channel coupling disturbances and significantly enhances system stability and robustness under parameter uncertainties and external disturbances. This provides a feasible technical solution for controlling guided rockets under extreme aerodynamic conditions.