Adaptive Finite-Time Coordinated Attitude Tracking Control for Spacecraft Formation with Unknown Time-Varying Inertia

This paper studies the adaptive finite-time coordinated attitude tracking control problem for spacecraft formation flying under directed communication topology in presence of unknown time-varying inertia and external disturbances. First, based on robust adaptive control method, we designed two adaptive components of the controller to accommodate the uncertainties of the system and compensate the external disturbance. In addition, combined with finite-time theory, consensus algorithm and graph theory, we proposed a robust adaptive finite-time coordinated attitude tracking control law to regulate the attitude to a common time-varying reference state in finite time. And, the control law applies to more extensive systems without requiring that the topology is strongly connected digraph or connected undirected graph. Finally, simulation results illustrate the effectiveness of the presented control approach.