Airframe

A laser agri-drone for point-precise weed removal

A small quadcopter with ground-side processing: the base station does the heavy compute, so the aircraft stays light, cheap and safe.

A laser agri-drone for point-precise weed removal
Carbon frameBrushless motors15″ propellersBatteryFlight controllerRadio modemRadar altimeterGPS/RTK antenna
Carbon frame4 rotors, 2.6 kg takeoff mass
Brushless motorsLow KV — thrust and efficiency
15″ propellersQuiet flight and a light airframe
Battery5,850 mAh, 6S — swapped in seconds
Flight controllerPixhawk 6X
Radio modemVideo stream and commands to the station
Radar altimeterExact height above the canopy
GPS/RTK antennaCentimetre-level positioning
Laser aiming system
End effector

Laser aiming system

  • Industrial camera — Global shutter, sharp frame in motion
  • Blue laser module — 450 nm, 20 W
  • 2D galvanometer — Mirror pair for instant aiming
  • Laser driver — Pulse power control
  • Active cooling — Heatsink + fan
450 nm, 20 WX / Y≈ 5 mm2D galvanometerIndustrial camera · Active cooling
Lead-angle algorithm

From frame to shot in under 50 ms

The drone never stops moving: the system solves the lead angle with a motion correction and hits the weed exactly.

0 ms10 ms20 ms30 ms40 ms50 ms8121436450 ms deadline47 msCapture and transmit f…Processing and detectionLead-angle solutionConfirmation and commandLaser shotDroneRadio linkStation
1Capture and transmit frameDrone
2Processing and detectionStation server
3Lead-angle solutionStation server
4Confirmation and command“Fire” command (X, Y)
5Laser shotDrone, <50 ms