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

作　　者：HUANG Yong HU XiaoGong LI PeiJia CAO JianFeng JIANG DongRong ZHENG WeiMin FAN Min 

机构地区：[1]Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China [2]Graduate University of Chinese Academy of Sciences,Beijing 100049,China [3]Beijing Aerospace Control and Command Center,Beijing 100094,China [4]Beijing Institute of Tracking and Telecommunications Technology,Beijing 100094,China

出　　处：《Chinese Science Bulletin》2012年第35期4545-4551,共7页

基　　金：supported by the National Natural Science Foundation of China(11073047,10703011);Science and Technology Commission of Shanghai(12DZ2273300)

摘　　要：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.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.

关 键 词：月球着陆器 精确定位 统计方法 VLBI测量 DEM数据 位置精度 数字高程模型 表面精度 

分 类 号：V476.4[航空宇航科学与技术—飞行器设计]