Advances in Aerospace Guidance, Navigation and Control

pp 681-699

Toward an Autonomous Lunar Landing Based on Low-Speed Optic Flow Sensors

  • Guillaume SabironAffiliated withBiorobotic Dept. of ISM, CNRS, ISM UMR 7287, Aix-Marseille UniversitéThe French Aerospace Lab, ONERA Email author 
  • , Paul ChaventAffiliated withThe French Aerospace Lab, ONERA
  • , Laurent BurlionAffiliated withThe French Aerospace Lab, ONERA
  • , Erwan KervendalAffiliated withAstrium Satellites
  • , Eric BornschleglAffiliated withEuropean Space Agency ESTEC
  • , Patrick FabianiAffiliated withThe French Aerospace Lab, ONERA
  • , Thibaut RaharijaonaAffiliated withBiorobotic Dept. of ISM, CNRS, ISM UMR 7287, Aix-Marseille Université
  • , Franck RuffierAffiliated withBiorobotic Dept. of ISM, CNRS, ISM UMR 7287, Aix-Marseille Université

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For the last few decades, growing interest has returned to the quite challenging task of the autonomous lunar landing. Soft landing of payloads on the lunar surface requires the development of new means of ensuring safe descent with strong final conditions and aerospace-related constraints in terms of mass, cost and computational resources. In this paper, a two-phase approach is presented: first a biomimetic method inspired from the neuronal and sensory system of flying insects is presented as a solution to perform safe lunar landing. In order to design an autopilot relying only on optic flow (OF) and inertial measurements, an estimation method based on a two-sensor setup is introduced: these sensors allow us to accurately estimate the orientation of the velocity vector which is mandatory to control the lander’s pitch in a quasi-optimal way with respect to the fuel consumption. Secondly a new low-speed Visual Motion Sensor (VMS) inspired by insects’ visual systems performing local angular 1-D speed measurements ranging from 1.5°/s to 25°/s and weighing only 2.8 g is presented. It was tested under free-flying outdoor conditions over various fields onboard an 80 kg unmanned helicopter. These preliminary results show that the optic flow measured despite the complex disturbances encountered closely matched the ground-truth optic flow.