Journal article Open Access

Free as a Bird: Event-based Dynamic Sense-and-Avoid for Ornithopter Robot Flight

Rodriguez-Gomez, Juan Pablo; Tapia, Raul; Guzman, Maria del Mar; Martinez de-Dios, Jose Ramiro; Ollero, Anibal

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    <dct:title>Free as a Bird: Event-based Dynamic Sense-and-Avoid for Ornithopter Robot Flight</dct:title>
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    <dct:description>&lt;p&gt;Autonomous flight of flapping-wing robots is a major challenge for robot perception. Most of the previous sense-and-avoid works have studied the problem of obstacle avoidance for flapping-wing robots considering only static obstacles. This paper presents a fully onboard dynamic sense-and-avoid scheme for large-scale ornithopters using event cameras. These sensors trigger pixel information due to changes of illumination in the scene such as those produced by dynamic objects. The method performs event-by-event processing in low-cost hardware such as those onboard small aerial vehicles. The proposed scheme detects obstacles and evaluates possible collisions with the robot body. The onboard controller actuates over the horizontal and vertical tail deflections to execute the avoidance maneuver. The scheme is validated in both indoor and outdoor scenarios using obstacles of different shapes and sizes. To the best of the authors&amp;#39; knowledge, this is the first event-based method for dynamic obstacle avoidance in a flapping-wing robot.&lt;/p&gt;</dct:description>
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Publication date:
January 31, 2022
DOI:
10.5281/zenodo.5924071

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Keyword(s):
event camera, ornithopter, flapping-wing robot, reactive sense-and-avoid.
Published in:
Robotic and Automation Letters (RA-L):.
Grants:
European Commission:
  • GRIFFIN - General compliant aerial Robotic manipulation system Integrating Fixed and Flapping wings to INcrease range and safety (788247)
  • AERIAL-CORE - AERIAL COgnitive integrated multi-task Robotic system with Extended operation range and safety (871479)
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