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Limei Ma, Yongheng Zhang, Yuli Niu, Yong Zhao, Shaoya Guan, Zijing Wang and Tuoda Wu
Ball-shell rotors with non-standard shapes, non-uniform conductive coatings, and eccentric masses machined by conventional processes constrain the improvement of levitation and torque accuracy of magnetically levitated momentum balls. This paper focuses ...
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Jifei Ye, Sibo Wang, Hao Chang, Yanji Hong, Nanlei Li, Weijing Zhou, Baoyu Xing, Bangdeng Du and Chengyin Xie
Laser micro-thrust technology is a type of propulsion that uses a laser beam to ablate a propellant such as a metal or plastic. The ablated material is expelled out the back of the spacecraft, generating thrust. The technology has the advantages of high ...
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Soobin Jeon, Sang-Young Park and Geuk-Nam Kim
CANYVAL-C is a formation-flying mission that demonstrates a coronagraph utilizing two CubeSats. The coronagraph is a space telescope that blocks sunlight to examine the overcast regions around the sun. It is composed of optical and occult segments. Two s...
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Paolo Soffitta
An observatory dedicated to X-ray polarimetry has been operational since 9 December 2021. The Imaging X-ray Polarimetry Explorer (IXPE), a collaboration between NASA and ASI, features three X-ray telescopes equipped with detectors sensitive to linear pol...
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Jihe Wang, Qingxian Jia and Dan Yu
The issue of active attitude fault-tolerant stabilization control for spacecrafts subject to actuator faults, inertia uncertainty, and external disturbances is investigated in this paper. To robustly and accurately reconstruct actuator faults, a novel mi...
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Ting Song, Zixuan Zheng, Yufei Guo and Jianping Yuan
A model-free control method is applied to the attitude and orbital operation of the post-capture combined spacecraft, which consists of a space robot and debris. The main contribution of this paper lies in the following three aspects. Firstly, the discre...
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Olli Jansson and Matthew W. Harris
This paper presents new techniques for the trajectory design and control of nonlinear dynamical systems. The technique uses a convex polytope to bound the range of the nonlinear function and associates with each vertex an auxiliary linear system. Provide...
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Ting Jin, Guohua Kang, Jian Cai, Shaoxia Jia, Jinghua Yang, Xinghua Zhang, Zhenhua Zhang, Long Li and Fangfang Liu
The low-frequency disturbances transmitted by flexible cables are difficult to be attenuated for a novel disturbance-free payload spacecraft, which decreases the payload?s pointing accuracy and stability. In this research, a new spacecraft configuration ...
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Tengfei Zhang and Rongjun Mu
To deal with the attitude tracking control problem of a struck or pierced geocentric polar displaced solar sail (GPDSS), an attitude adaptive control strategy is proposed in this paper under the complex conditions of unknown inertial parameters, external...
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Ahmed Mahfouz, Gabriella Gaias, D. M. K. K. Venkateswara Rao and Holger Voos
In this paper, the problem of autonomous optimal absolute orbit keeping for a satellite mission in Low Earth Orbit using electric propulsion is considered. The main peculiarity of the approach is to support small satellite missions in which the platform ...
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