摘要
嫦娥四号任务实现了人类首次月球背面软着陆.在任务设计阶段,为制定着陆器动力下降控制策略和设计月面工作程序,根据嫦娥二号、LRO等月球卫星探测得到的图像、激光测高等数据,对冯·卡门撞击坑着陆区的高程起伏、坡度、撞击坑和石块分布密度,以及着陆区内地形对光照和中继链路遮挡进行了详细分析.本文对嫦娥四号冯·卡门撞击坑着陆区的地形地貌情况进行了总结,对地形地貌及遮挡分析所使用的方法进行了详细说明,同时将嫦娥四号着陆区同嫦娥三号虹湾着陆区的地形地貌进行了对比分析,最后对实际在轨着陆点进行了精确定位并分析了着陆点周围地形的遮挡情况.所形成的系统性分析方法在轨得到了全面验证,并为后续月球及深空探测软着陆任务奠定了坚实的基础.
The Chang’E-4 lunar probe successfully made a soft landing on the far side of the Moon, the first such landing in the history. To determine the powered-descent control strategy and operational programs for the lunar surface, a detailed analysis was carried out on the key factors of the surface topography in the Von Kármán cater. It included the elevations, slopes, distribution densities of craters and rocks, as well as the terrain occlusions to sun illumination and communication signals between the probe and the relay satellite.The analysis was based on images collected by the Chang’E-2 satellite and the images and laser range measurements acquired by the Lunar Reconnaissance Orbiter. This paper presents the topographic and occlusion analysis results of the Chang’E-4 landing site in the Von Kármán crater. The methods for topographic and occlusion analysis are described in detail. This paper also presents a comparative study of the topographic features in the Chang’E-4 landing area and the Chang’E-3 landing area in Sinus Iridum, on the near side of the Moon. Finally, the precise landing location of Chang’E-4 is presented, and the above-mentioned terrain occlusions are analyzed. The analytical methods described in this paper have demonstrated their effectiveness in real operations and can benefit future missions involving soft landings on celestial bodies.
作者
李飞
吴波
杨眉
赵洋
张熇
吴学英
许映乔
叶青
LI Fei;WU Bo;YANG Mei;ZHAO Yang;ZHANG He;WU XueYing;XU YingQiao;YE Qing(Beijing Institute of Spacecraft System Engineering,China Academy of Space Technology,Beijing 100094,China;Department of Land Surveying and Geo-Informatics,The Hong Kong Polytechnic University,Hong Kong 999077,China)
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2019年第12期1385-1396,共12页
Scientia Sinica(Technologica)
基金
国家中长期科技发展规划重大专项资助项目
