Active Disturbance Rejection Control for Drag-Free Satellites with Saturation-Constrainted Observations

• Published in: 2019 Chinese Control Conference (CCC) pp. 4296 - 4301
• Main Authors: Yang, Fei, Diao, Jing-Dong
• Format: Conference Proceeding
• Language: English
• Published: Technical Committee on Control Theory, Chinese Association of Automation 01.07.2019
• Subjects: Acceleration; active disturbance rejection control; drag-free; extended state estimation; Gravity; Mathematical model; Observers; Satellites; saturation constraint
• ISSN: 2161-2927
• DOI: 10.23919/ChiCC.2019.8865733

The construction of the active disturbance rejection controller of the gravity satellite drag-free control system is inseparable from the design of the extended state observer to estimate the disturbance of the system. In practical applications, the observation of the relevant information by the sensor is subject to saturation constraint. This affects the estimation of the disturbance by the extended state observer, which in turn affects the performance of the drag-free control system. In this paper, the model of drag-free control system is firstly established, and then the set-valued state estimation theory is used to derive the extended state estimation algorithm under the condition of observation subject to saturation constraint, and it is applied to the estimation of the extended state of the gravity satellite drag-free control system based on the observation information of the acceleration sensor. In addition, the estimation results based on the acceleration sensor are combined with the estimation results based on the displacement sensor, which improves the estimation accuracy of the disturbance of the system. Finally, the gravity satellite active disturbance rejection drag-free controller is designed, and the simulation experiment has achieved good results.