Finite-Time Distributed Set-Point Attitude Tracking Control of Multi-Spacecraft Using Relative Measurements

摘要

The finite-time set-point attitude tracking control problem of multi-spacecraft is studied. Each spacecraft is driven to align its attitude with a command one, where the command attitude is not known to all spacecraft. In order to achieve this objective, most of the current literatures assume that each spacecraft takes advantage of passive communication to obtain the information from its local neighbors. On the other hand, we consider in this paper that such relative information herein is acquired by active measurement unit equiped by each spacecraft. A finite-time distributed controller is proposed based on sliding mode control methodology. Specifically, a sliding mode surface is first specified such that the error trajectory, once reaches it, will converge to the origin within finite time. Next, by implementing such a sliding mode surface, a non-singular control torque is synthesized. It is shown that the tracking errors achieve finite-time convergence to a tunable neighborhood. Simulations are finally presented to demonstrate the effectiveness of the distributed controller.