Never landing drone: Autonomous soaring of a unmanned aerial vehicle in front of a moving obstacle

• Published in: International journal of micro air vehicles Vol. 13
• Main Authors: de Jong, Chris PL, Remes, Bart DW, Hwang, Sunyou, De Wagter, Christophe
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01-12-2021; Sage Publications Ltd
• Subjects: Controllers; Drone aircraft; Drone vehicles; Energy consumption; Flight control systems; Hovering flight; Moving obstacles; Power consumption; Simulation; Soaring; Throttles; Unmanned aerial vehicles; Wind speed; practical tests; orographic lift; flight control; simulation; updraft; fixed-wing; Soaring
• ISSN: 1756-8293; 1756-8307
• DOI: 10.1177/17568293211060500

Increasing endurance is a major challenge for battery-powered aerial vehicles. A method is presented which makes use of an updraft around obstacles to decrease the power consumption of a fixed-wing unmanned aerial vehicle. A soaring flight controller has been developed that can autonomously soar while the unmanned aerial vehicle keeps its relative position to that of a moving object. Multiple simulations have been performed to analyse the limitations of the soaring controller under different conditions. The effect of a change in wind velocity and updraft has been analysed. The simulations showed that an increase in updraft decreases the energy consumption of the flight controller. An increase in wind velocity results in a higher updraft requirement, while a decrease in the wind velocity requires less updraft. The simulations achieved sustained flight at 0% throttle. The controller has been validated experimentally using the updraft generated by a moving ship. The practical, autonomous tests reduced the average throttle down to 4.5% in front of a ship. The method presented in this study achieved successful hovering flight using an energy control module for longitudinal positioning.