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The analysis of the Earth co-orbital motion of Chang'e-2 after asteroid flyby

Chinese Science Bulletin 2014年第17期59卷 2045-2049页

作者： Yang Gao Technology and Engineering Center for Space Utilization Chinese Academy of Sciences

After the Chang’e-2 spacecraft conducted a successful asteroid flyby,where is it flying to in interplanetary space?This question is answered via an introduction to the Chang’e-2’s flight trajectory after asteroid flyby that is termed Earth co-orbital *** on preliminary analysis using the dynamical systems theory,Poincare′sections concept,and routine optimization techniques,it is now predicted that,from the point of view of orbital mechanics,Chang’e-2 is capable of returning to the vicinity of the Earth in no more than 20 a and might be recaptured by the Earth if appropriate orbital maneuvers are going to be exerted,either by itself or by another spacecraft that captures Chang’e-2.

关键词：轨道运动小行星地球动力系统理论宇宙飞船庞加莱截面星际空间飞行轨迹

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Close relative motion on distant retrograde orbits

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Chinese Journal of Aeronautics 2023年第3期36卷 335-356页

作者： Chihang YANG Ming WANG Hao ZHANG University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Space Utilization Technology and Engineering Center for Space UtilizationChinese Academy of SciencesBeijing 100094China

Distant Retrograde Orbits(DROs)in the Earth-Moon system have great potential to support varieties of missions due to the favorable stability and orbital ***,the close relative motion on DROs should be analyzed to design formations to assist or extend the DRO ***,as the reference DROs are obtained through numerical methods,the close relative motions on DROs are non-analytical,which severely limits the design of relative *** this paper,a novel approach is proposed to construct the analytical solution of bounded close relative motion on *** linear dynamics of relative motion on DRO is established at *** preliminary forms of the general solutions are obtained based on the Floquet *** the general solutions are classified as different modes depending on their periodic components.A new parameterization is applied to each mode,which allows us to explore the geometries of quasi-periodic modes in *** each mode,the solutions are integrated as a uniform expression and their periodic components are expanded as truncated Fourier *** this way,the analytical bounded relative motion on DRO is *** on the analytical expression,the characteristics of different modes are comprehensively *** natural periodic mode is always located on the single side of the target spacecraft on DRO and is appropriate to be the parking orbits of the rendezvous and *** the basis of quasi-periodic modes,quasi-elliptical fly-around relative trajectories are designed with the assistance of only two impulses per *** fly-around formation can support observations to targets on DRO from multiple viewing *** the fly-around formation is validated in a more practical ephemeris model.

关键词： Distant retrograde orbits Ephemeris model Floquet theory Formation flight Relative motion spacecraft Three-body problem Transfer singularity

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Recent Progress in space Science and Applications of China’s space Station in 2020-2022

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空间科学学报 2022年第4期42卷 503-510页

作者： GAO Ming ZHAO Guangheng GU Yidong Technology and Engineering Center for Space Utilization Chinese Academy of SciencesBeijing 100094

China scheduled to complete the assembly of the T-shaped Tiangong space Station in 2022,and will enter a new stage of *** are more than 20 experiment racks inside the modules,and more than 50 external onboard payloads mounting spaces,which will support large-scale science and technology experiments during the *** development of internal experiment racks and external research accommodations approved during the construction has been completed,of which 4 racks in Tianhe core module,including High Microgravity Level research Rack(HMLR)and Container-less Materials Processing Rack(CMPR),have finished on-orbit tests;while other racks in Wentian and Mengtian experiment modules are under comprehensive ground *** Chinese space Survey Telescope(CSST)has advanced much in the last two years with 24 pre-launch research projects funded and 4 joint science center built in preparation for CSST’s future scientific observations and *** systematic research planning for China’s space Station(CSS)during 2022-2032 is updated with the researches classified into four important areas:space life sciences and human research,microgravity physical sciences,space astronomy and Earth science,and new space technologies and *** to the planning,more than 1000 experiments are expected to perform in CSS during the operating ***,the CSS utilization missions are proceeding as planned,which will contribute to the major scientific or application output and have a positive impact on the quality of life on Earth.

关键词： China’s space Station(CSS) space utilization Experiment racks Chinese space Survey

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Detumbling strategy based on friction control of dual-arm space robot for capturing tumbling target

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Chinese Journal of Aeronautics 2020年第3期33卷 1093-1106页

作者： Gang CHEN Yuqi WANG Yifan WANG Ji LIANG Long ZHANG Guangtang PAN School of Automation Beijing University of Posts and TelecommunicationsBeijing 100876China Key Laboratory of Space Utilization Technology and Engineering Center for Space UtilizationChinese Academy of SciencesBeijing 100094China

The rotational motion of a tumbling target brings great challenges to space robot on successfully capturing the tumbling ***,it is necessary to reduce the target's rotation to a rate at which capture can be accomplished by the space *** this paper,a detumbling strategy based on friction control of dual-arm space robot for capturing tumbling target is *** strategy can reduce the target's rotational velocity while maintaining base attitude stability through the establishment of the rotation attenuation controller and base attitude adjustment *** rotation attenuation controller adopts the multi-space hybrid impedance control method to control the friction *** base attitude adjustment controller applies the dual-arm extended Jacobian matrix to stabilize the base *** main contributions of this paper are as follows:(1)The compliant control method is adopted to achieve a precise friction control,which can reduce the target angular velocity steadily;(2)The dual-arm extended Jacobian matrix is applied to stabilize the base attitude without affecting the target capture task;(3)The detumbling strategy of dualarm space robot is designed considering base attitude stabilization,realizing coordinated planning of the base attitude and the *** strategy is verified by a dual-arm space robot with two 7-DOF(degrees of freedom)*** results show that,target with a rotation velocity of 20(°)/s can be effectively controlled to stop within 30 s,and the final deflection of the base attitude is less than 0.15°without affecting the target capture task,verifying the correctness and effectiveness of the *** to the tumbling target capture task,the control strategy can also be applied to other typical on-orbit operation tasks such as space debris removal and spacecraft maintenance.

关键词： Detumbling strategy Dual-arm space robot Free-floating base Friction control Tumbling target capturing

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A multi-frame sparse self-learning PWC-Net for motion estimation in satellite video scenes

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Science China(Information Sciences) 2023年第9期66卷 213-225页

作者： Tengfei WANG Yanfeng GU Shengyang LI School of Electronics and Information Engineering Harbin Institute of Technology Technology and Engineering Center for Space Utilization Chinese Academy of Sciences University of Chinese Academy of Sciences

Motion estimation is an important approach to acquiring motion information of all targets in satellite video while it provides the ability to real-time monitor the Earth observation region. Compared with the case in computer vision, motion estimation in satellite video has to face two main difficulties: the large scale of observation and numerous weak targets of low signal-to-noise ratio. In this paper, a multi-frame sparse self-learning PWC-Net(MSSPWC-Net) is proposed to implement motion estimation of the weak targets in satellite video. To overcome the shortage that the existing PWC-Net fails to extract motion information from numerous weak targets, motion consistency and sparse self-learning are introduced to modify the pyramid,warping, and cost volume convolutional neural networks(CNN) network(PWC-Net). The motion consistency between neighboring frames as a multi-frame framework is mainly used to improve the accuracy of motion estimation of the weak targets, and sparse self-learning is adopted to deal with the case that labeled samples in satellite video are insufficient to train PWC-Net. Numerical experiments are conducted on 4 real satellite video datasets. Experimental results demonstrate that the proposed MSSPWC-Net achieves the excellent performance of motion estimation of the weak targets in satellite video and outperforms the state-of-the-art methods.

关键词： satellite video scenes motion estimation small blurry targets

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Overview of the Lunar In Situ Resource utilization Techniques for Future Lunar Missions

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space(Science & technology) 2023年第1期3卷 293-310页

作者： Peng Zhang Wei Dai Ran Niu Guang Zhang Guanghui Liu Xin Liu Zheng Bo Zhi Wang Haibo Zheng Chengbao Liu Hanzhe Yang Yifan Bai Yang Zhang Dong Yan Kefa Zhou Ming Gao Technology and Engineering Center for Space Utilization Chinese Academy of SciencesBeijing 100094China

Along with the rapid development of space technology,extraterrestrial exploration has gradually tended to further-distanced and longer-termed planet *** the first step of an attempt for humans to build a perpetual planet base,building a lunar base by in situ resource utilization(ISRU)will drastically reduce the reliance of supplies from *** resources including mineral resources,water/ice resources,volatiles,and solar energy will contribute to the establishment of a lunar base for long-term life support and scientific exploration missions,although we must consider the challenges from high vacuum,low gravity,extreme temperature conditions,*** article provides a comprehensive review of the past developing processes of ISRU and the latest progress of several ISRU technologies,including in situ water access,in situ oxygen production,in situ construction and manufacture,in situ energy utilization,and in situ life support and plant cultivation on the *** being able to provide some material and energy supplies for lunar base construction and scientific exploration,the ISRU technologies need continuous validation and upgrade to satisfy the higher requirements from further lunar exploration ***,a 3-step development plan for lunar ISRU technologies in the next decade is proposed,which consists of providing technological solutions,conducting technical verification on payloads,and carrying out in situ experiments,with the ultimate aim of establishing a permanent lunar station and carrying out long-term lunar surface scientific *** overview of ISRU techniques and our suggestions will provide potential guidance for China’s future lunar exploration missions.

关键词： planet payload lunar

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Science Researches of Chinese Manned space Flight

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空间科学学报 2014年第5期34卷 518-524页

作者： GU Yidong GAO Ming ZHAO Guangheng LIU Yingchun JIN Zhaojun Technology and Engineering Center for Space Utilization Chinese Academy of Sciences

With the complete success of the 2nd stage of Chinese Manned space Program(CMSP),several science researches have been performed on Tiangong-1 experimental spacelab, which was docked with three Shenzhou spaceships one after another. The China's real spacelab, Tiangong-2 will be launched in 2015, docked with a Shenzhou spaceship soon. After six months, it will be docked with the first Chinese cargo ship(Tianzhou-1). More space science researches, involving with space biology, fluid physics, fundamental physics, materials science, Earth science, astronomy and space environmental science, will be operated on Tiangong-2 spacelab, and crewed and cargo spaceships. Furthermore, the considerable large-scale space utilization of Shina's space Station is planned. The research fields include yet not limited to space medicine and physiology, space life science and biotechnology, fluid physics and combustion in microgravity, space material science,and fundamental physics in microgravity, space astronomy, Earth science, space physics and space environment utilization, technology demonstration.

关键词： Science research Chinese Manned space Program(CMSP) space station

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The space Sciences and Application Projects in space Laboratory

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空间科学学报 2016年第5期36卷 626-632页

作者： GU Yidong GAO Ming ZHAO Guangheng Technology and Engineering Center for Space Utilization Chinese Academy of Sciences

space sciences and application projects arranged in Tiangong-2 space laboratory and Tianzhou-1 cargo ship have been described in detail,covering research areas of the fundamental physics,space astronomy,microgravity fluid physics and materials science,space life science,and earth *** experiments and researches will hopefully produce great scientific results and social benefits in several fields,including:universe evolution,quantum communication,material development,global climate change and earth environment,etc.

关键词：航天实验室空间科学应用微重力流体物理空间生命科学全球气候变化空间实验室中国科学院

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Autonomous navigation of an asteroid orbiter enhanced by a beacon satellite in a high-altitude orbit

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Astrodynamics 2024年第3期8卷 375-400页

作者： Weidong Yin Yu Shi Leizheng Shu Yang Gao University of Chinese Academy of Sciences Beijing100049China Key Laboratory of Space Utilization Technology and Engineering Center for Space UtilizationChinese Academy of SciencesBeijing100094China

This study aims to assess the autonomous navigation performance of an asteroid orbiter enhanced using an inter-satellite link to a beacon *** navigation includes the orbit determination of the orbiter and beacon,and asteroid gravity estimation without any ground station *** measurements were acquired using satellite-to-satellite tracking(SST)and optical observation of asteroid surface *** study presents a new orbiter-beacon SST scheme,in which the orbiter circumnavigates the asteroid in a low-altitude strongly-perturbed orbit,and the beacon remains in a high-altitude weakly-perturbed *** used Asteroid 433 Eros as an example,and analyzed and designed low-and high-altitude orbits for the orbiter and *** navigation measurements were precisely modeled,extended Kalman filters were devised,and observation configuration was analyzed using the Cramer-Rao lower bound(CRLB).Monte Carlo simulations were carried out to assess the effects of the orbital inclination and altitudes of the orbiter and beacon as key influencing *** simulation results showed that the proposed SST scheme was an effective solution for enhancing the autonomous navigation performance of the orbiter,particularly for improving the accuracy of gravity estimation.

关键词： asteroid exploration gravity estimation orbit determination satellite-to-satellite tracking(SST) optical observation

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space Research Plan of China's space Station

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空间科学学报 2016年第5期36卷 595-599页

作者： GU Yidong GAO Ming ZHAO Guangheng Technology and Engineering Center for Space Utilization Chinese Academy of Sciences

China's manned spaceflight missions have been introduced briefly,and the research planning of space sciences for China's space Station(CSS) has been presented with the topics in the research areas,including:life science and biotechnology,microgravity fluid physics and combustion science,space material science,fundamental physics,space astronomy and astrophysics,earth sciences and application,space physics and space environment,experiments of new space *** research facilities,experiment racks,and supporting system planned in CSS have been described,including:multifunctional optical facility,research facility of quantum and optic transmission,and a dozen of research racks for space sciences in pressurized module,*** the next decade,significant breakthroughs in space science and utilization will hopefully be achieved,and great contributions will be made to satisfy the need of the social development and people's daily life.

关键词：太空研究计划空间站中国微重力流体物理空间物理学科学研究计划空间材料科学航天任务

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