

FOLLOWUS
1.National Key Laboratory of Inertial Technology, Beihang University, Beijing 100191, China
2.Novel Inertial Instrument & Navigation System Technology Key Laboratory of Fundamental Science for National Defense, Beihang University, Beijing 100191, China
Ke SUN, kekeesun81@aspe.buaa.edu.cn
Received:28 November 2011,
Revised:2012-;4-;9,
Published:2012-05
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Jian-cheng FANG, Ke SUN. Composite disturbance attenuation based saturated control for maintenance of low Earth orbit (LEO) formations[J]. Frontiers of Information Technology & Electronic Engineering, 2012, 13(5): 328-338.
Jian-cheng FANG, Ke SUN. Composite disturbance attenuation based saturated control for maintenance of low Earth orbit (LEO) formations[J]. Frontiers of Information Technology & Electronic Engineering, 2012, 13(5): 328-338. DOI: 10.1631/jzus.C1100350.
Maintenance of high performance formation control is important for low Earth orbit (LEO) formation missions of small spacecraft. In this paper
a model of nonlinear relative motion dynamics is built
and then nonlinear and important perturbations affecting the formation configuration
such as
J
2
and atmospheric drag
are analyzed as disturbances. Global navigation satellite system based relative positioning with nonlinear filtering is adopted to provide state information associated with the perturbations. By combining disturbance observer based control with
H
∞
state feedback
a composite disturbance attenuation controller is proposed for maintenance of continuous and accurate formation. With consideration of precise control relying on micro thrusters
a composite disturbance attenuation based saturated controller is designed and its stability is proved. Finally
through numerical simulations
we demonstrate that control accuracy is improved after effectively avoiding perturbations and that stabilization can be satisfied using this method.
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