A flight control system for parafoils based on improved PID control approach

The PID control technique which is improved by linear extended state observer (LESO) is applied to the design of the flight control system for parafoils with Global Position System(GPS). Firstly, in this paper, the nonlinear dynamics model of the parafoil system is outlined. Then, method of guidance and the theory of LESO is presented in detail. Next, the control system using improved PID control technique is introduced integrally. The results of simulation and flight test are presented and analyzed at the end of the paper. The results of the improved controller show the great superiority to the traditional PID controller. In the flight test, the error of the trajectory tracking is less than twenty meters and the control strategy has great application value on the precision aerial delivery system.