Affiliation of Author(s):航天学院

Journal:JOURNAL OF AEROSPACE ENGINEERING

Key Words:Mars entry Attitude tracking Supertwisting sliding mode disturbance observer Terminal sliding mode control Antiwindup

Abstract:Uncertainty and external disturbance during the Mars entry process inevitably degrade the performance of Mars entry guidance and control algorithms. Traditional approaches focus on suppressing disturbances and compensating uncertainties, which usually results in larger control responses beyond the limited control capability of a Mars entry vehicle. This paper further takes the limited actuator ability into consideration and proposes the Mars entry robust attitude control strategy using the terminal sliding mode control (TSMC) with antiwindup (AW) and a supertwisting sliding mode disturbance observer (SMDO). First, terminal sliding mode control with antiwindup is developed to robustly track the nominal attitude command under uncertainty and limited control capability. Then, the supertwisting sliding mode disturbance observer is introduced to online estimate the disturbances and further enhance the attitude control accuracy and robustness. Finally, the comparison simulation results illustrate that the proposed control strategy not only performs well in tracking the reference commands even in the presence of uncertain disturbance, but also avoids the control saturation issue.

ISSN No.:0893-1321

Translation or Not:no

Date of Publication:2018-09-01

Co-author:江秀强

Correspondence Author:李爽