Title: Incremental control and guidance of hybrid aircraft applied to the Cyclone tailsitter UAV,
Abstract: Hybrid unmanned aircraft, that combine hover capability with a wing for fast
and efficient forward flight, have attracted a lot of attention in recent
years. Many different designs are proposed, but one of the most promising is
the tailsitter concept. However, tailsitters are difficult to control across
the entire flight envelope, which often includes stalled flight. Additionally,
their wing surface makes them susceptible to wind gusts. In this paper, we
propose incremental nonlinear dynamic inversion control for the attitude and
position control. The result is a single, continuous controller, that is able
to track the acceleration of the vehicle across the flight envelope. The
proposed controller is implemented on the Cyclone hybrid UAV. Multiple outdoor
experiments are performed, showing that unmodeled forces and moments are
effectively compensated by the incremental control structure, and that
accelerations can be tracked across the flight envelope. Finally, we provide a
comprehensive procedure for the implementation of the controller on other types
of hybrid UAVs.