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Updated: Mar 28, 2026

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Extended State Observer based control for coaxial-rotor UAV.

M Rida Mokhtari1, Amal Choukchou Braham1, Brahim Cherki1

  • 1Laboratoire d׳Automatique de Tlemcen (LAT), Electrical Engineering Department, Tlemcen University, Algeria.

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|December 29, 2015
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Summary

This study presents a hierarchical flight controller for Coaxial-Rotor Unmanned Aerial Vehicles (CRUAVs) to manage position and orientation despite unknown aerodynamic forces. The controller effectively tracks trajectories and stabilizes the CRUAV using an Extended State Observer (ESO).

Keywords:
Active disturbance rejection controlCoaxial-rotorExtended State ObserverHierarchical control

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Area of Science:

  • Robotics and Control Systems
  • Aerospace Engineering
  • Unmanned Aerial Vehicle (UAV) Technology

Background:

  • Controlling Coaxial-Rotor Unmanned Aerial Vehicles (CRUAVs) is challenging due to unpredictable aerodynamic disturbances.
  • Existing control strategies often struggle to maintain precise position and orientation under such conditions.

Purpose of the Study:

  • To design and validate a hierarchical flight controller for CRUAVs capable of managing unknown aerodynamic efforts.
  • To achieve robust trajectory tracking and attitude stabilization for the CRUAV.

Main Methods:

  • A hierarchical control architecture with two loops: an inner loop for attitude control and an outer loop for translational trajectory control.
  • Implementation of an Extended State Observer (ESO) to estimate the CRUAV's state and unknown aerodynamic disturbances.
  • Design of a control law incorporating the disturbance estimation from the ESO.

Main Results:

  • The proposed hierarchical controller demonstrated effective control over both position and orientation.
  • The Extended State Observer successfully estimated unknown aerodynamic disturbances in real-time.
  • Numerical simulations confirmed the efficiency and robustness of the developed control strategy.

Conclusions:

  • The designed hierarchical flight controller, utilizing an Extended State Observer, provides a viable solution for controlling CRUAVs with unknown aerodynamic disturbances.
  • The study highlights the effectiveness of the ESO in enhancing the performance and stability of CRUAV flight control systems.