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Flying over uneven moving terrain based on optic-flow cues without any need for reference frames or accelerometers.

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  • 1Aix Marseille University, CNRS, ISM UMR 7287, F-13288, Marseille, France.

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Bio-inspired optic flow (OF) guidance principles enable rotorcraft to navigate and land safely without an inertial reference frame. This research demonstrates autonomous flight control using panoramic sensors, mimicking insect navigation strategies.

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Area of Science:

  • Robotics
  • Bio-inspired engineering
  • Control systems

Background:

  • Autonomous aerial robots often rely on inertial reference frames for navigation.
  • Insect flight provides a model for bio-inspired navigation without complex sensors.
  • Optic flow (OF) is a crucial sensory input for biological navigation.

Purpose of the Study:

  • To implement and test two bio-inspired guidance principles for rotorcraft navigation.
  • To evaluate rotorcraft performance using optic flow sensors without an inertial reference frame.
  • To demonstrate safe terrain following and landing capabilities.

Main Methods:

  • Development of an 80-gram tandem rotorcraft, BeeRotor, equipped with panoramic OF sensors.
  • Implementation of two guidance systems: fixed-eye orientation (CurvACE) and active reorientation.
  • Testing in a high-roofed tunnel and over rugged terrain under varying light conditions.

Main Results:

  • The rotorcraft successfully adjusted pitch and speed for ground hugging and safe landing.
  • Both CurvACE and the active reorientation system enabled autonomous terrain following.
  • Navigation and landing were achieved without any need for an inertial reference frame.

Conclusions:

  • Bio-inspired OF guidance principles are effective for autonomous rotorcraft control.
  • Rotorcraft can achieve safe flight and landing using only optic flow information.
  • This approach offers a lightweight and robust alternative to traditional navigation systems.