Hybrid Feedback for Global Tracking on Matrix Lie Groups $SO(3)$ and $SE(3)$

TL;DR

This paper proposes a novel hybrid control strategy for global attitude and pose tracking on $SO(3)$ and $SE(3)$, overcoming undesired equilibria and measurement limitations with stability guarantees.

Contribution

It introduces a new hybrid control mechanism using potential functions with flow and jump dynamics, improving global stability and removing measurement requirements.

Findings

Achieves global asymptotic stability on $SO(3)$.

Provides semi-global exponential stability guarantees.

Demonstrates effectiveness through simulation results.

Abstract

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.