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This paper addresses the problem of driving a quadrotor vehicle along a predefined 3-D trimming path. The proposed solution relies on the definition of a path-dependent error space to express the dynamic model of the vehicle, which results in linear time-invariant dynamics for the error system. The controller synthesis problem is then formulated as a linear quadratic regulator problem for LTI systems...
This paper addresses the design and experimental evaluation of a controller to steer a helicopter along a desired trajectory. The controller is designed based on Lyapunov's method and backstepping technique. Control laws for thrust and angular velocity are presented that guarantee the convergence of the trajectory tracking error to zero for a simplified helicopter model. Experimental results, which...
A homing control law for a quadrotor is presented to drive the vehicle towards a moving target at constant longitudinal velocity. The vehicle is driven to the homing point through force control with an inner-outer loop control strategy. For the outerloop, the position and velocity features are exploited to derive a control law that directs the vehicle to the homing target while ensuring it never collides...
This paper addresses the problem of steering a quadrotor vehicle along a time-dependent trajectory. The problem is formulated so as to take into account force disturbances acting on the vehicle and enforce bounds on the actuation. The proposed solution consists of a nonlinear adaptive state feedback controller for thrust and torque actuation that i) guarantees asymptotic stability of the closed-loop...
This brief addresses the design and experimental evaluation of a global controller to steer a quadrotor vehicle along a predefined path in the presence of constant wind disturbances. The proposed solution consists of a nonlinear adaptive state feedback controller for thrust and torque actuation that: 1) guarantees global convergence of the closed-loop path following error to zero in the presence of...
This paper addresses the problem of designing and experimentally validating a controller for steering an autonomous quadrotor vehicle along a time-dependent trajectory, while rejecting constant force disturbances. The proposed solution consists of a nonlinear adaptive state feedback controller that asymptotically stabilizes the closed-loop system and ensures perfect tracking even in the presence of...
This work addresses the design and experimental evaluation of a robust controller for a quadrotor landing maneuver comprising the approach to a landing slope and sliding on that slope, before coming to a complete halt. During the critical landing flight phase the dynamics of the vehicle change with the type of contact with the ground and a hybrid automaton, whose states reflect the several dynamic...
This paper addresses the problem of designing and experimentally validating a controller for steering a quadrotor vehicle along a trajectory, while rejecting wind disturbances. The proposed solution consists of a nonlinear adaptive state feedback controller for thrust and torque actuation that asymptotically stabilizes the closed-loop system in the presence of constant force disturbances, used to...
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