Volume 39 Issue 5
Sep.  2019
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Article Navigation >  Chinese Journal of Space Science  > 2019  >  39(5): 670-676
ZHANG Chu, HE Jianwu, DUAN Li. Parameter Identification of Drag-free System Based on Extended State Observer[J]. Chinese Journal of Space Science, 2019, 39(5): 670-676. doi: 10.11728/cjss2019.05.670
Citation: ZHANG Chu, HE Jianwu, DUAN Li. Parameter Identification of Drag-free System Based on Extended State Observer[J]. Chinese Journal of Space Science, 2019, 39(5): 670-676. doi: 10.11728/cjss2019.05.670
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Parameter Identification of Drag-free System Based on Extended State Observer

doi: 10.11728/cjss2019.05.670 cstr: 32142.14.cjss2019.05.670

  • 1. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190;

  • 2. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190

  • Received Date: 2018-09-25
  • Rev Recd Date: 2019-03-26
  • Publish Date: 2019-09-15
    Abstract
  • In this paper, in-orbit parameter identification problem of drag-free control system is studied. Since the drag-free system is not stable, it is necessary to design controllers to stablize this system, then the system can be identificated. According to the principle of active disturbance rejection control, the extended state observer is designed to estimate the disturbance and state of different control loops of the system. Based on the state and disturbance estimation values, the controller is designed to stabilize the system. A closed-loop parameter identification method for multi-input and multi-output systems based on extended state observer is proposed. In order to improve the identification effect in practical applications, the noise in the observed state is suppressed by introducing an integral filter, and the noise suppression mechanism is theoretically explained. Finally, this method is applied to a single-axis non-drag model similar to LISA Pathfinder, and the system dynamics parameters are estimated. The numerical simulation experiments have verified the validity and practicability of the proposed identification method.

     

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