A Meta-Learning-based Trajectory Tracking Framework for UAVs under Degraded Conditions
This addresses safety and reliability issues for autonomous UAVs in real-world degraded conditions, representing an incremental improvement with a novel method for a known bottleneck.
The paper tackles the problem of trajectory tracking for UAVs under actuator faults and disturbances by proposing a meta-learning-based framework that adapts at runtime, resulting in a drastic increase in tracking performance validated in simulations and experiments.
Due to changes in model dynamics or unexpected disturbances, an autonomous robotic system may experience unforeseen challenges during real-world operations which may affect its safety and intended behavior: in particular actuator and system failures and external disturbances are among the most common causes of degraded mode of operation. To deal with this problem, in this work, we present a meta-learning-based approach to improve the trajectory tracking performance of an unmanned aerial vehicle (UAV) under actuator faults and disturbances which have not been previously experienced. Our approach leverages meta-learning to train a model that is easily adaptable at runtime to make accurate predictions about the system's future state. A runtime monitoring and validation technique is proposed to decide when the system needs to adapt its model by considering a data pruning procedure for efficient learning. Finally, the reference trajectory is adapted based on future predictions by borrowing feedback control logic to make the system track the original and desired path without needing to access the system's controller. The proposed framework is applied and validated in both simulations and experiments on a faulty UAV navigation case study demonstrating a drastic increase in tracking performance.