基于嫦娥一号卫星获取的DEM研究月球车通信的可达性

The Communication Accessibility of the Lunar Rover Based on DEM Derived from Chang'E-1

月球车通信可达性分析为研究月球车着陆点选择提供了依据。主要通过建立数学模型,将由测高数据获取的数字高程模型(DEM)和地-月轨道参数相结合,来研究我国月球探测首选着陆区虹湾地区和月球极区的通信条件受地形条件的影响。利用"嫦娥一号"探月卫星获取的激光测高数据,得到了全月面高精度的DEM,为本研究的进行提供了精确的数据基础。本研究选取的计算时间为2013年10月1日到2013年10月30日止。计算结果表明:(1)在虹湾地区,测控上海站、昆明站、北京站和乌鲁木齐站与月球车之间的通信条件不受月面地形的影响,通信畅通,这与该地区平坦的地势是一致的;(2)月球极区由于地形的复杂性,通信条件受地形的影响很大。

The communication accessibility of the lunar rover from the Earth to the Moon can provide a basis for the choice of ideal landing sites. In this paper, a mathematical model is established to study the communication accessibility affected by topography, by combining lunar digital elevation models （DEM） with known parameters related to lunar and earth＇s orbit. The laser altimeter data obtained by ＇Chang＇ E-1 ＇ can provide high accuracy DEM and can be as the data basis for this study. The research region is Sinus Iridum region （the preferred landing area of Chinese lunar exploration） and the lunar polar regions. The calculation period is from Oct. 1, 2013 to Oct. 30, 2013. The results show that （1） in the Sinus Iridum region, the communication condition between tracking stations （Beijing, Kunming, Shanghai and Urumchi） and the lunar rover is expedite, which is consistent with the region＇ s flat terrain; （2） in the polar regions, the influence of topography on the communication condition is great because of the topography complexity.