Precise positioning of the Chang’E-3 lunar lander using a kinematic statistical method

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...

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Bibliographic Details
Published in:Chinese science bulletin 2012-12, Vol.57 (35), p.4545-4551
Main Authors: Huang, Yong, Hu, XiaoGong, Li, PeiJia, Cao, JianFeng, Jiang, DongRong, Zheng, WeiMin, Fan, Min
Format: Article
Language:English
Subjects:
Chemistry/Food Science
computer software
Earth Sciences
Engineering
Humanities and Social Sciences
Life Sciences
multidisciplinary
Physics
Science
Science (multidisciplinary)
space flight
statistical analysis
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Summary: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.
ISSN:1001-6538
1861-9541
DOI:10.1007/s11434-012-5484-5