Three-dimensional integrated guidance and control for BTT aircraft constrained by terminal flight angles

Aiming at a class of bank-to-turn (BTT) aircraft with fixed target and constrained terminal flight angles, a novel three-dimensional integrated guidance and control (3D-IGC) design approach is put forward in this paper. Based on some simplification principles, one nonlinear mathematical model facing to 3D-IGC design is first deduced. For a class of multi-variable nonlinear system, a robust dynamic inversion control (RDIC) method is proposed by introducing a type of control compensation term. Combined RDIC theory with backstepping method, the preliminary design of 3D-IGC law is finished. Then, in order to deal with the problems of “explosion of terms” and high-frequency chattering at control input, which are respectively resulted from the traditional backstepping method and the introduced nonlinear compensation term, the dynamic surface control (DSC) method and the continuous approximation method are both employed. Simulation results present that, the proposed 3D-IGC law can guarantee the stable flight and accurate guidance of researched aircraft, and also satisfy the constrained condition of terminal flight angles. Furthermore, the 3D-IGC scheme possesses strong robust property against system uncertainties.