Influence Analysis of Terrain of the Farside of the Moon on Soft-Landing
-
摘要:
相对于月球正面大面积平坦的月海区域,月球背面地形整体崎岖复杂,因此地形地貌的变化会对探测器的软着陆探测产生一定的影响。从任务设计、着陆器设计和月面工作程序3个方面分析了“嫦娥4号”着陆区南极-艾特肯盆地(South-Pole Aitken Basin,SPA),及其相对于“嫦娥3号”着陆区的变化,主要结论包括:1)着陆区范围缩小,由“嫦娥3号”着陆区经度范围16.4°和纬度范围3°,减小到经度范围约4°和纬度范围约2°;2)动力下降策略更改,动力下降过程主减速段结束后,着陆器由斜向前运动轨迹改为接近垂直向下运动轨迹,同时更改测距敏感器的引入时机;3)提高微波测距测速敏感器信号发射功率和信噪比;4)着陆后需要预测着陆器的光照和测控被地形遮挡的情况,然后制定如休眠或月食模式等相应策略等。通过以上优化设计,“嫦娥4号”任务可适应月球背面地形地貌的变化,有效降低着陆过程和月面工作的风险。
Abstract:Chang'e-4 probe is planned to land on the farside of the moon for the first time of the human being. Compared to the nearside of the moon, the terrain on the farside of the moon is rugged and complex, and there is no large flat area, so the change of the terrain will affect the soft-landing of Chang'e-4. The Chang'e-4 landing site on the South-Pole Aitken Basin is analyzed and compared wth the landing area of Chang'e-3 mission, considering the influences ofthe mission design, the lander design and the lunar working procedure. The main conclusions are as follows:1) The latitude and longitude range of the landing area is reduced from 16.4° and 3° for Chang'e-3 mission to about 4° and 2° for Chang'e-4 mission; 2) During the power descent phase, the strategy after the main deceleration phase is changed from the oblique forward motion trajectory to the vertical down trajectory, and the operation time of the distance measuring sensor is also changed; 3) The signal transmission powers and signal to noise ratios of the microwave ranging and velocity sensor will be improved; 4) The lighting of the lander and the communication by the terrain occlusion will be prediected, and the design operation strategies such as sleep mode or eclipse mode will be established. Through the modification, Chang'e-4 mission can be adapted to the changes in the topography of the farside of the moon to reduce the risk of landing and lunar mission.
-
Key words:
- Chang'e-4 /
- farside of the moon /
- South-Pole Aitken Basin /
- soft-landing /
- terrain
-
[1] 于登云等. 月球软着陆探测器技术[M]. 北京:国防工业出版社,2016. [2] 褚桂柏,张熇. 月球探测器技术[M]. 北京:中国科学技术出版社,2007. [3] Sun Z Z,Jia Y,Zhang H. Technological advancements and promotion roles of Chang'e-3 lunar probe mission[J]. Science China (Technological Sciences),2013,43(11):2702-2708. [4] 张健,缪秉魁,廖庆园,等. 月球南极艾特肯盆地的地质特征:探索月球深部的窗口[J]. 矿物岩石地球化学通报,2011年,30(2):234-240.Zhang J,Miao B K,Liao Q Y,et al. The geological characteristics of the South Pole-Aitken Basin on the Moon:the window to explore the deep composition of the Moon[J]. Bulletin of Mineralogy,Petrology and Geochemistry,2011,30(2):234-240. [5] Kyeong J K,James M D,Jean P W. The South Pole-Aitken basin region,Moon:GIS-based geologic investigation using Kaguya elemental information[J]. Advances in Space Research,2012,50(12):1629-1637. [6] David A K,Daniel D D. A global lunar landing site study to provide the scientific context for exploration of the Moon[R]. USA:LPI-JSC Center for Lunar Science and Exploration,2012. [7] Peterson C A,Hawke B R,Blewett D,et al. Geochemical units on the Moon:The Role of South Pole-Aitken basin[C]//Lunar and Planetary Science XXXⅢ. USA:[s.n.],2002:46-47. [8] Peterson C A,Hawke B R,Lucey P G,et al. Anorthosite on the lunar farside and its relationship to South Pole-Aitken Basin[C]//Lunar and Planetary Science XXXI. USA:[s.n.],2000:1680-1681. [9] Lucey P G,Taylor G J,et al. FeO and TiO2 Concentrations in the South Pole-Aitken Basin:implications for mantle composition and basin formation[J]. Journal of Geophysical Research,1998,103(E2):3701-3708. [10] Wu Y Z,Xue B,Zhao B C,et.al. Global estimates of lunar iron and titanium contents from the Chang'E-1 ⅡM data[J]. Journal of Geophysical Research:Planets (1991-2012),2012,117(E2):1-23. [11] 李飞,马继楠,张熇,等. 基于月球背面的嫦娥4号着陆区选择方法研究[C]//中国宇航学会深空探测技术专业委员会第十三届学术年会,上海:CDSET-CSA,2016. [12] 黄翔宇,张洪华,王大轶,等. "嫦娥3号"探测器软着陆自主导航与制导技术[J]. 深空探测学报,2014,1(1):44-51.WANG D Y,LI J,HUANG X Y,et al. A pinpoint autonomous for navigation and hazard avoidance method lunar soft landing[J]. Journal of Deep Space Exploration,2014,1(1):44-51. [13] Klumpp A R. Apollo guidance,navigation and control R-695[R].[S.l.]:NASA,1971. [14] Thomas F. Lunar landing and ascent trajectory guidance design for the Autonomous Landing and Hazard Avoidance Technology (ALHAT) Program[J]. Advances in the Astronautical Sciences,2010,136:2317-2336. -

计量
- 文章访问数: 2869
- HTML全文浏览量: 90
- PDF下载量: 937
- 被引次数: 0