Designing the Quadratic optimal digital controller to stabilize the longitudinal trajectory for fixed-wing unmanned aircraft
Keywords:
DLQR controller, Fixed-wing unmanned aircraft, Flight trajectoryAbstract
Orbital stabilization for fixed-wing Unmanned Aerial Vehicles is a complex task. With the same set angle value, but the actual flight trajectory results are different in different conditions of altitude, airspeed, temperature, dynamic pressure,... The control of fixed-wing unmanned aircraft includes many channels, namely the pitch angle controller, roll angle controller, yaw angle controller. They are usually designed using traditional PID control methods. However, in order to gain a tactical advantage, modern fighters are often geared toward maneuvers outside the linear region, so a more effective approach is to design a the full state Linear Quadratic Regulator DLQR. This is an important basis for the actualization of the orbital-stabilized DLQR digital controller for fixed-wing unmanned aerial vehicles. The simulation results show the effectiveness and sustainability of this control strategy even in the presence of aerodynamic torque disturbances and parametric instability.
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