嫦娥五号探测器月面定位与精度分析  

Lunar Positioning of CE-5 Detectors and Precision Analysis

作　　者：郭丽[1,2] 李金岭 王广利[1,2] 黄逸丹[1] 王文彬 郑为民[1,2] GUO Li;LI Jinling;WANG Guangli;HUANG Yidan;WANG Wenbin;ZHENG Weimin(Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;Shanghai Key Laboratory of Space Navigation and Positioning Techniques,Shanghai 200030,China)

机构地区：[1]中国科学院上海天文台,上海200030 [2]上海市空间导航与定位技术重点实验室,上海200030

出　　处：《武汉大学学报（信息科学版）》2023年第12期2033-2039,共7页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(11873076);探月工程(嫦娥五号)。

摘　　要：嫦娥五号(Change’E-5,CE-5)着上组合体与上升器先后成功着陆于月面。两探测器承担的任务不同,着陆方式不同,因此月面位置解算方法不同。联合统一X波段(united X-band,UXB)深空测距站及甚长基线干涉测量技术(very long baseline interferometry,VLBI)的测量数据计算两者的月面位置。采用联合统计定位方法得到CE-5着上组合体的月面位置。讨论分别基于数传与侧音差分单向测距(differential one-way ranging,DOR)两种信号对月面位置的影响。观测资料的时间跨度在一定程度上影响定位结果。采用多项式拟合的运动学统计定轨方法归算了上升器受控落月轨迹及落月位置,并与单点定位结果符合在40 m内。根据相关处理机最后输出时刻推算得到精确至ms的上升器的落月时刻。Objective:Combination of ascender and lander and ascender of Change’E-5(CE-5)detectors successively landed on the moon successfully.The mission and landing modes of these two detectors are different,so we use different methods to determine their landing positions.Methods:The lunar positions are obtained with the combined the data from unified X-band(UXB)tracking network and very long baseline interferometry(VLBI)network.The method of joint statistical positioning is investigated to determine CE-5 combination of ascender and lander.Although data precision between the data-transmission signal and sidetone signal of differential of range(DOR)is marked,their effects on the positioning are not significant.Longer scale of observation data help improving the position precision,but the total length of 1 h satisfies the accuracy requirements.Results:The kinematic statistical method by polynomial fitting is used to determine the landing trajectory and the lunar position of CE-5 ascender,and is compared with the point positioning method.Their differences are better than 40 m.The landing moment of CE-5 ascender is also calculated to millisecond accuracy.Conclusions:Our method will provide a valuable reference for the lunar positioning of detectors in the future phase IV of Chinese lunar project.

关 键 词：嫦娥五号 联合统计定位 运动学统计定轨 上升器 VLBI UXB 

分 类 号：P228[天文地球—大地测量学与测量工程]