Journal of Astronautics ›› 2015, Vol. 36 ›› Issue (8): 923-931.doi: 10.3873/j.issn.1000-1328.2015.08.009

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Finite Time Relative Position Control for Drag Free Dual Satellite Serial Formation

ZHANG Yong he, LIANG Xu wen, ZHANG Jian, HU Qing lei   

  1. 1. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;
     2. Shanghai Engineering Centre of Microsatellites, Shanghai 201203,China;
    3. School of Astronautics, Harbin Institute of Technology, Harbin 150001, China
  • Received:2014-08-07 Revised:2014-10-27 Online:2015-08-15 Published:2015-08-25


Relative position control for a serial-formation formed by two drag-free satellites is investigated in this paper. Firstly, a relative motion model is derived based on a novel coordination whose origin is set on the middle point of the two satellites′ position, taking J2 perturbation into consideration. Different from the traditional leader-follower model, in which the orbit dynamics of the leader is established under ideal conditions, disturbances acting on both satellites are taken into account in the new relative motion model. A control algorithm is developed based on adaptive parameter updating plus power integrator technique, thus guaranteeing practical finite-time stability of the closed-loop system. And then, relative position error between the two satellites can be steered to the desired value at fast convergence rate. Finally, numerical simulation is carried out to show both effectiveness and robustness of the proposed algorithm.

Key words: Drag-free satellite;Finite-time;Relative position, Adaptive control

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