Precise positioning of the Chang’E-3 lunar lander using a kinematic statistical method
Precise positioning of the Chang’E-3 lunar lander using a kinematic statistical method
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DOI：
10.1007/s11434-012-5484-5
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发表时间：
2012-12
影响因子：
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通讯作者：
Yong Huang;Xiaogong Hu;Peijia Li;Jianfeng Cao;Dongrong Jiang;W. Zheng;Min Fan
中科院分区：
文献类型：
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作者：
Yong Huang;Xiaogong Hu;Peijia Li;Jianfeng Cao;Dongrong Jiang;W. Zheng;Min Fan
提出了一种运动学统计方法来确定嫦娥三号月球着陆器的位置。该方法使用测距和VLBI测量着陆器的连续弧，结合行星星历提供的有关月球运动的精确知识，以高精度估计着陆器在月球表面的位置。利用上海天文台研制的软件对模拟数据进行了精度分析，结果表明，测量误差将对定位精度起主导作用。分析了月球数字高程模型（DEM）作为约束条件在着陆器定位中的应用。仿真结果表明，结合距离/多普勒和VLBI数据，单历元定位精度可达数百米量级，但在10分钟的数据积累下，定位精度可达数米量级。分析还表明，当DEM数据将三维定位问题简化为二维时，DEM提供的信息可以为定位提供约束。考虑到在CE-1和CE-2任务期间已经对CE-3着陆器计划着陆区域的虹湾进行了专门的详细观测，其区域DEM模型精度可能高于全球模型，这肯定会支持CE-3的着陆器定位。
A kinematic statistical method is proposed to determine the position for Chang’E-3 (CE-3) lunar lander. This method uses both ranging and VLBI measurements to the lander for a continuous arc, combing with precise knowledge about the motion of the moon as provided by planetary ephemeris, to estimate the lander’s position on the lunar surface with high accuracy. Accuracy analyses are carried out with simulation data using the software developed at Shanghai Astronomical Observatory in this study to show that measurement errors will dominate the position accuracy. Application of lunar digital elevation model (DEM) as constraints in the lander positioning is also analyzed. Simulations show that combing range/doppler and VLBI data, single epoch positioning accuracy is at several hundred meters level, but with ten minutes data accumulation positioning accuracy is able to be achieved with several meters. Analysis also shows that the information given by DEM can provide constraints in positioning, when DEM data reduce a 3-dimensional positioning problem to 2-dimensional. Considering the Sinus Iridum, CE-3 lander’s planned landing area, has been observed with dedicated details during the CE-1 and CE-2 missions, and its regional DEM model accuracy may be higher than global models, which will certainly support CE-3’s lander positioning.