论文标题
矩阵Lie组的全球跟踪的混合反馈SO(3)$和$ SE(3)$
Hybrid Feedback for Global Tracking on Matrix Lie Groups $SO(3)$ and $SE(3)$
论文作者
论文摘要
我们引入了一种新的混合控制策略,该策略在概念上与常用的协同混合方法不同,以有效地处理不希望的平衡问题,该问题排除了从实现全球稳定性中$(3)上的平滑矢量字段。关键想法是在$(3)\ times \ mathbb {r} $上构建合适的潜在功能,该功能涉及辅助标量变量,具有流量和跳跃动力学,这使状态远离了不良的关键点,同时保证降低了流量和流动的潜在功能和跳跃。基于这种新的混合机制,提出了$(3)$的态度跟踪问题的混合反馈控制方案,并具有全球渐近稳定性和半全球指数稳定性保证。通过平滑机制进一步改善了该控制方案,该机制消除了输入扭矩中的不连续性。本文提出的第三个混合控制方案消除了角速度测量的要求,同时保留了第一个混合控制方案的强稳定性保证。这种方法也已应用于$ SE(3)$上的跟踪问题,以说明其在现有协同混合方法方面的优势。最后,提出了一些仿真结果,以说明所提出的混合控制器的性能。
We introduce a new hybrid control strategy, which is conceptually different from the commonly used synergistic hybrid approaches, to efficiently deal with the problem of the undesired equilibria that precludes smooth vectors fields on $SO(3)$ from achieving global stability. The key idea consists in constructing a suitable potential function on $SO(3)\times \mathbb{R}$ involving an auxiliary scalar variable, with flow and jump dynamics, which keeps the state away from the undesired critical points while, at the same time, guarantees a decrease of the potential function over the flows and jumps. Based on this new hybrid mechanism, a hybrid feedback control scheme for the attitude tracking problem on $SO(3)$, endowed with global asymptotic stability and semi-global exponential stability guarantees, is proposed. This control scheme is further improved through a smoothing mechanism that removes the discontinuities in the input torque. The third hybrid control scheme, proposed in this paper, removes the requirement of the angular velocity measurements, while preserving the strong stability guarantees of the first hybrid control scheme. This approach has also been applied to the tracking problem on $SE(3)$ to illustrate its advantages with respect to the existing synergistic hybrid approaches. Finally, some simulation results are presented to illustrate the performance of the proposed hybrid controllers.