May 2022, Volume 3 Issue 4
    

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  • The Rising China Space Heading for the Endless Universe
    2016, 3(4): 295-306. https://doi.org/10.15982/j.issn.2095-7777.2016.04.001
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  • Review of Technology Development for Chinese Lunar Exploration Program
    YU Dengyun, WU Xueying, WU Weiren
    2016, 3(4): 307-314. https://doi.org/10.15982/j.issn.2095-7717.2016.04.002
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    Before the year of 2020,the Chinese Lunar Exploration Program will be implemented in three steps of "Orbiting the Moon,Landing the Moon and Returning from the Moon". This paper shows that the engineering and scientific goal, implementation result and the major technical achievement for the Chang'e-1,Chang'e-2,Chang'e-3 and Chang'e-5 Circumlunar Return and Reentry missions. After that,this paper gives the developing trends of Lunar Exploration Program and system ideas and framework of the future lunar missions.
  • The Achievement and Future of China Space Transportation System
    QIN Xudong, LONG Lehao, RONG Yi
    2016, 3(4): 315-322. https://doi.org/10.15982/j.issn.2095-7777.2016.04.003
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    China Launch Vehicle technology development was started in 1960s. From then on, Long March launch vehicles have experienced five stages of development, and four generations of Long March launch vehicles have been developed,which ensures China to launch various payloads into different orbits. Based on the achievements of development and future demands, the prospects for future development plans are discussed.
  • Achievements and Prospect of Chinese Lunar Probes
    YE Peijian, YU Dengyun, SUN Zezhou, SHEN Zhenrong
    2016, 3(4): 323-333. https://doi.org/10.15982/j.issn.2095-7777.2016.04.004
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    This paper briefly reviews the overall development history of domestic and overseas lunar explorations firstly. Secondly the development and implementation of Chinese lunar probes are introduced. Thirdly the technical achievements and scientific results accomplished by Chinese lunar probes are concluded. Lastly the prospect of Chinese lunar probe is looked forward.
  • Key Technologies of Solar Sail Spacecraft
    HU Haiyan
    2016, 3(4): 334-344. https://doi.org/10.15982/j.issn2095-7777.2016.04.005
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    This article surveys the key technologies of solar sail spacecraft in the following four aspects,the global design, the orbit and altitude controls,the solar sail materials and their properties,and the folding and deployment of solar sails. For each aspect,the article summarizes the major contents and features according to the previous studies abroad and presents the recent advances in China,including the recent studies of the author's laboratory. Based on the successful achievements and detailed analysis on open problems,the article addresses some important issues,which will receive more attention when China develops solar sail spacecraft.
  • Research Status and Developing Trend of the Autonomous Navigation, Guidance, and Control for Planetary Landing
    YU Zhengshi, CUI Pingyuan
    2016, 3(4): 345-355. https://doi.org/10.15982/j.issn.2095-7777.2016.04.006
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    Autonomous navigation,guidance,and control is one of the key technologies for planetary landing,which has a direct impact on mission success. In this paper,the necessity and importance of the further research on the autonomous navigation,guidance,and control are elaborated focusing on the developing demand for the Mars and small body landing mission in the future. Based on the environment features,the challenges encountered for the autonomous navigation,guidance,and control are analyzed. Then and the key techniques involved are discussed,and the state-of-the-art techniques and research tendency of the autonomous navigation for planetary landing are summarized. Finally,the development trends of the autonomous navigation,guidance,and control for Chinese planetary landing mission in the future are previewed.
  • Mapping and Characterization Techniques of Asteroid Topography
    XU Qing, WANG Dong, XING Shuai, LAN Chaozhen
    2016, 3(4): 356-362. https://doi.org/10.15982/j.issn.2095-7777.2016.04.007
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    Asteroid surface topography surveying and mapping is the first mission of deep space exploration on asteroids. This paper puts forward one method of stereo vision online surveying and mapping the asteroid surface topography when detector approaching observation. It can obtain the 3D terrain of overlapping area by stereo camera,and connect adjacent models by their connection points,determine the shape model and characteristic of the asteroid by means of least squares adjustment. It also puts forward one method of crater feature detection based on contourline analysis,and the crater features in the terrain are identified by extracting and analyzing terrain contour line. Experimental results show that the prototype system can quickly rebuild the 3d terrainof exploring area,identify impact craters from the 3D terrain,and it is proved that the proposed method is practical.
  • An Integrated Evaluation of Planetary Safe Landing Site
    CUI Pingyuan, GE Dantong
    2016, 3(4): 363-369. https://doi.org/10.15982/j.issn.2095-7777.2016.04.008
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    With the development of precise landing technology,the terrain condition of the area that the vehicle can reach will be more and more complex. To ensure landing safety,the vehicle needs to assess the landing area topography in the field of view based on the sensor information and picks out a place suitable for landing. In order to solve this problem,the paper proposes a planetary landing site selection method and designs a referential selection index. The safe landing site is chosen according to the evaluation result of terrain condition and fuel consumption. MATLAB simulation proves the effectiveness of the method in both rapid selection process and traversal selection process,which improves mission success probability and landing safety.
  • A Pulse Control Strategy of Landers for Hopping Exploration on Small Bodies
    LIU Yanjie, ZHU Shengying, CUI Pingyuan
    2016, 3(4): 370-376. https://doi.org/10.15982/j.issn.2095-7777.2016.04.009
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    Surface investigation is an effect way to improve the cognition of small bodies for human being. Considering the impacts of the irregular micro-gravity near small bodies,the lander may bounce above the surface when touches down which is a dangerous situation for landing. Meanwhile,the movement of the surface detector is generally achieved by hopping ways. In this paper,a pulse control strategy is developed in order to improve the stability and accuracy for small body landing and long-distance transfer,and the corresponding guidance law is developed. This control strategy can be used for the scenarios of both re-landing and multi-hopping exploration on a small body. Firstly,the velocity pulse is exerted at the initial points if the transfer is needed. Such velocity pulse can be computed based on the parabolic movement. Then,the trajectories are corrected based on the pulse control. The proposed guidance law is flexible enough to be implemented in real time for small body landers. To certificate the performance of the proposed control strategy,simulations are conducted and the effectiveness and accuracy are analyzed.
  • Model Predictive Control Guidance for Constrained Mars Pinpoint Landing
    WANG Ting, GUO Yanning, ZHANG Yao, MA Guangfu
    2016, 3(4): 377-383. https://doi.org/10.15982/j.issn.2095-7777.2016.04.010
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    Abstract:This paper investigated an approach to trace a fuel optimal trajectory for Mars pinpoint landing mission with a variety of geometrical constraints. A model predictive control(MPC)approach is designed to minimize the performance index while at the same time keeping the constraints. With the proposed method,the spacecraft can achieve pinpoint landing. To validate the effectiveness of the proposed MPC approach,simulation results are included for illustration.
  • A Craters Detection Algorithm Based on Multiscale Edge Extraction
    XI Sha, SHAO Wei
    2016, 3(4): 384-388. https://doi.org/10.15982/j.issn.2095-7777.2016.04.011
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    As for the craters on the surface of planets can be used to autonomous navigation and obstacle recognition,the craters detection algorithm based on multiscale edge extraction is proposed. In this algorithm,different scale craters are detected through the Gaussian pyramid. For the different scales of crater images,firstly,using edge drawing parameter free(EDPF)to get edge segment of crater,and connecting critical edge pixels into line segment for representing the edge segment;then joining the line segments with the same turn direction into circular arcs,and fitting circular arcs with similar radius and center into candidate circles or ellipse,finally validating candidate circles and ellipses through calculating the number of false alarm(NFA). Especially,the algorithm can be used to detect craters accurately with high detection rate,and has good performances in images with many craters.