Design, Development and Evaluation of Longitudinal Autopilot for An Unmanned Aerial Vehicle Using X-Plane/Simulink

Abstract

Presently there is a vast interest in unmanned aerial vehicle (UAV) development given its civilian and military applications. One of the main UAV components is autopilot system. Its development invariably demands several lab simulations and field tests. Generally after an UAV crash few parts remain unused. Thus, before embedding an autopilot system, it has to be exhaustively lab tested. With educational and research purposes in autopilot control systems development area, a test platform is herein proposed. It employs Matlab/Simulink to run the autopilot controller under test. The autopilot controller designed on Matlab/Simulink is tested by controlling an aircraft on X-Plane. The inputs given to the aircraft flight control surfaces in the X-Plane are simultaneously sent to the microcontroller which translates these commands into effective servo movement control. Through this platform, designed autopilot systems can be applied into models similar to real aircraft minimizing risks and increasing flexibility for design changes. As study case, tests results from a pitch attitude autopilot system are presented.