基于非奇异Terminal滑模方法的四旋翼无人机姿态控制
首发时间:2016-06-02
摘要:为了实现四旋翼无人机对给定姿态的快速跟踪,本文基于Terminal滑模控制方法设计了一种四旋翼无人机的姿态控制器。传统的欧拉角表示姿态会产生奇异现象,因此采用四元数来对姿态进行描述,避免奇异现象。在设计滑动超平面时引入非线性函数,构造Terminal滑模面,使得在滑模面上跟踪误差能够在指定有限时间内收敛到零。通过lyapunov理论证明系统的稳定性,并计算出收敛时间。仿真结果验证了算法的有效性。
关键词: 四旋翼无人机 姿态控制 Terminal 滑模控制
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Attitude Stabilization of Quadrotor UAV Based on Terminal Sliding Mode Control without Singularity
Abstract:In this paper, an attitude controller for quadrotor UAV is designed based on terminal sliding mode control method to ensure a rapid orientation tracking. Due to the existence of singularities when using the Euler angle representation, the attitude is represented by unit-quaternions to avoid the singularities. A nonlinear function is introduced to design a terminal sliding mode surface, so that the tracking error could converge to zero in finite time. Based on lyapunov theory, the stability of the closed-loop system is proved, and the convergence time is given. Simulation results show the effectiveness of the proposed control scheme.
Keywords: quadrotor UAV attitude stabilization terminal sliding mode control
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