ResearchResearch paperReinforcement Learning · Robotics & Embodied AI1 source · Oct 11, 2026

REFLEX: A Learned On-Board Reflex for Robust Autonomous Collision Recovery of Soft Quadrotors

We present REFLEX, a collision-recovery flight mode that runs entirely on the flight controller, requiring neither contact sensors nor a companion computer.

Key points

  • Collision-resilient airframes allow quadrotors to survive impacts, but do not ensure autonomous post-collision recovery.
  • Innovation gating in stock onboard estimators often rejects valid external velocity measurements after high-speed impacts, compromising recovery.
  • Its proprioceptive recurrent policy stabilizes the vehicle without position, velocity, heading, or altitude estimates.
  • In hardware experiments, REFLEX recovered 19 of 22 wall impacts at 5.03 $\pm$ 0.09 m/s, compared with 1 of 14 for the matched stock autopilot.

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