A terrain-following control approach for a VTOL Unmanned Aerial Vehicle using average optical flow

This paper presents a nonlinear controller for terrain following of a vertical take-off and landing vehicle (VTOL). The VTOL vehicle is assumed to be a rigid body, equipped with a minimum sensor suite (camera, IMU and barometric altimeter) maneuvering over a textured rough terrain made of a concatenation of planar surfaces. Assuming that the forward velocity is separately regulated to a desired value, the proposed control approach ensures terrain following and guarantees that the vehicle does not collide with the ground during the task. The proposed control acquires an optical flow from multiple spatially separate observation B. Herisse CEA, LIST, Interactive Robotics Laboratory, 18 route du panorama, BP6, Fontenay aux Roses, F-92265, France Tel.: +331-46-549449 Fax: +331-46-548980 E-mail: [email protected] T. Hamel I3S, UNSA-CNRS, 2000 route des Lucioles, BP121, Sophia Antipolis Cedex, 06903, France Tel.: +334-92-942701 Fax: +334-92-942898 E-mail: [email protected] R. Mahony Department of Engineering, Building 32, North Road, The Australian National University, Canberra ACT, 0200, Australia Tel.: +612-61-258613 Fax: +612-61-250506 E-mail: [email protected] F.-X. Russotto CEA, LIST, Interactive Robotics Laboratory, 18 route du panorama, BP6, Fontenay aux Roses, F-92265, France Tel.: +331-46-549052 Fax: +331-46-548980 E-mail: [email protected] points, typically obtained via multiple cameras or non collinear directions in a unique camera. The proposed control algorithm has been tested extensively in simulation and then implemented on a quadrotor UAV to demonstrate the performance of the closed-loop system.