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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2016, Vol. 37 ›› Issue (5): 1552-1562.doi: 10.7527/S1000-6893.2015.0220

• Electronics and Control • Previous Articles     Next Articles

Active disturbance rejection control for spacecraft rendezvous and docking simulation system during proximity operations

XU Zheyao, CHEN Yukun, QI Naiming, YANG Yong   

  1. School of Astronautics, Harbin Institute of Technology, Harbin 150001, China
  • Received:2015-06-11 Revised:2015-08-05 Online:2016-05-15 Published:2015-08-18

Abstract:

Spacecraft rendezvous and docking ground simulation system are used to study the dynamics, navigation and control algorithms of spacecraft on the ground. Spacecraft simulators are floated on the marble platform using planar air bearings to simulate a frictionless and space micro-gravity environment. While the marble platform cannot be absolutely horizontal, the component of simulator gravity will lead to the sliding of the simulator on the platform, which is particularly serious for large-scale simulator. In this paper, a trajectory for proximity operations of spacecraft ground simulator is designed. Signal is filtered by tracking differentiator (TD) in the control process. A controller of the simulator is designed to compensate for the disturbances by extended state observer (ESO). The disturbances are estimated in real time. The thruster allocation strategy of the cold jet thrusters system is also designed and control of thrusters using pulse width modulation (PWM) is presented. The method proposed is applied to the spacecraft rendezvous and docking ground simulation system. Experimental results show that the control method is highly effective in reducing the effects of the sliding force disturbance.

Key words: spacecraft simulator, cold-gas thruster control, tracking differentiator, extended state observer, air-bearings

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