Automatic Take Off, Tracking and Landing of a Miniature UAV on a Moving Carrier Vehicle

Authors:
Karl Engelbert Wenzel;Andreas Masselli;Andreas Zell
Affiliations:
Department of Computer Science, University of Tübingen, Tübingen, Germany 72076;Department of Computer Science, University of Tübingen, Tübingen, Germany 72076;Department of Computer Science, University of Tübingen, Tübingen, Germany 72076
Venue:
Journal of Intelligent and Robotic Systems
Year:
2011

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Abstract

We present a system consisting of a miniature unmanned aerial vehicle (UAV) and a small carrier vehicle, in which the UAV is capable of autonomously starting from the moving ground vehicle, tracking it at a constant distance and landing on a platform on the carrier in motion. Our visual tracking approach differs from other methods by using low-cost, lightweight commodity consumer hardware. As main sensor we use a Wii remote infrared (IR) camera, which allows robust tracking of a pattern of IR lights in conditions without direct sunlight. The system does not need to communicate with the ground vehicle and works with an onboard 8-bit microcontroller. Nevertheless the position and orientation relative to the IR pattern is estimated at a frequency of approximately 50 Hz. This enables the UAV to fly fully autonomously, performing flight control, self-stabilisation and visual tracking of the ground vehicle. We present experiments in which our UAV performs autonomous flights with a moving ground carrier describing a circular path and where the carrier is rotating. The system provides small errors and allows for safe, autonomous indoor flights.