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“嫦娥4号”高精度VLBI测轨技术

王广利 洪晓瑜 刘庆会 李斌 马军 苏彦 郝龙飞

王广利, 洪晓瑜, 刘庆会, 李斌, 马军, 苏彦, 郝龙飞. “嫦娥4号”高精度VLBI测轨技术[J]. 深空探测学报(中英文). doi: 10.15982/j.issn.2095-7777.2020.20200026
引用本文: 王广利, 洪晓瑜, 刘庆会, 李斌, 马军, 苏彦, 郝龙飞. “嫦娥4号”高精度VLBI测轨技术[J]. 深空探测学报(中英文). doi: 10.15982/j.issn.2095-7777.2020.20200026
WANG Guangli, HONG Xiaoyu, LIU Qinghui, LI Bin, MA Jun, SU Yan, HAO Longfei. High-Precision VLBI Orbit Measurement Technology in the Chang'E-4 Mission[J]. Journal of Deep Space Exploration. doi: 10.15982/j.issn.2095-7777.2020.20200026
Citation: WANG Guangli, HONG Xiaoyu, LIU Qinghui, LI Bin, MA Jun, SU Yan, HAO Longfei. High-Precision VLBI Orbit Measurement Technology in the Chang'E-4 Mission[J]. Journal of Deep Space Exploration. doi: 10.15982/j.issn.2095-7777.2020.20200026

“嫦娥4号”高精度VLBI测轨技术

doi: 10.15982/j.issn.2095-7777.2020.20200026
基金项目: 国家自然科学基金资助项目(11873077)
详细信息
    作者简介:

    王广利(1965– ),男,研究员,博士生导师,主要研究方向:深空探测射电测量技术、天体测量与空间大地测量。通讯地址:中国科学院上海天文台(200030)电话:(021)34775230 E-mail:wgl@shao.ac.cn

  • ● For the first time,S-band ΔDOR technology was successfully applied to relay satellite orbit measurement. ● Adopt fast task switching mode to take into account the requirements of relay satellite orbit measurement during the orbit measurement of the lander-rover combination prober. ● For the first time,the Tianma 65-meter radio telescope was used to carry out the on-orbit calibration of the relay satellite antenna,and the calibration accuracy was better than the main beam of the relay antenna by 2%.
  • 中图分类号: P135,P164

High-Precision VLBI Orbit Measurement Technology in the Chang'E-4 Mission

  • 摘要: “嫦娥4号”在国际上首次实现了月球背面软着陆和巡视勘察。“嫦娥4号”中继星任务中首次创新性使用S波段ΔDOR测量技术,自主研制了S波段ΔDOR观测数据处理系统;探测器任务期间,首次实现了VLBI系统分时快速转换观测中继星和探测器;利用天马射电望远镜对中继星天线进行了在轨指向标定。深入分析了VLBI需要解决的主要技术问题,提出了具体的解决措施,通过重点对中继星、探测器实时任务期间的测量结果的分析,得出这些技术手段对任务目标的完成具有重要作用。
    Highlights
    ● For the first time,S-band ΔDOR technology was successfully applied to relay satellite orbit measurement. ● Adopt fast task switching mode to take into account the requirements of relay satellite orbit measurement during the orbit measurement of the lander-rover combination prober. ● For the first time,the Tianma 65-meter radio telescope was used to carry out the on-orbit calibration of the relay satellite antenna,and the calibration accuracy was better than the main beam of the relay antenna by 2%.
  • 图  1  ΔDOR测量示意图

    Fig.  1  Schematic diagram of ΔDOR

    图  2  中继星两组S波段ΔDOR信号(F1、F2)

    注:pc表示主载波,L1表示左侧侧音,R1表示右侧侧音,侧音间隔实际为3.7 MHz左右。

    Fig.  2  Two sets of S band ΔDOR signals of relay satellite(F1,F2)

    图  3  探测器两组X ΔDOR信号(F4、F5)

    Fig.  3  Two sets of X band ΔDOR signals of prober(F4,F5)

    图  4  在65 m站加装S波段超导滤波器,消除RFI前后的信号变化对比

    Fig.  4  The s-band superconducting filter is installed to eliminate or weaken RFI,the contrast of beforeand after

    图  5  采用新的电离层建模预报策略计算的定轨残差与老方法的对比

    注:观测数据为CE-5T1任务期间的实测数据,以南山−天马基线为例。红色是老的电离层模型修正效果,蓝色是新方法结果,可见蓝色更接近零值,新方法显著提高了电离层修正精度。

    Fig.  5  The comparison between the orbit determination residual calculated by the new ionospheric modeling and prediction method and the old method

    图  6  探测器、中继星分时快速切换观测流程

    Fig.  6  Quick task-switching of observation of relay satellite and prober.

    图  7  中继星天线指向坐标系

    图  8  中继星天线在轨指向标定示意图

    Fig.  8  Schematic diagram of pointing calibration of relay satellite antenna in orbit

    图  9  指向迭代拟合过程

    Fig.  9  Pointing offset estimation by iterative fitting

    图  10  中继星实时任务期间的实时性统计蓝色、橙色和灰色分别表示时延、时延率、定位结果的实时性统计

    Fig.  10  VLBI real-time processing performance of relay satellite during real-time tracking

    图  11  探测器实时任务期间的实时性统计

    Fig.  11  VLBI real-time processing performance of prober during real-time tracking

    图  12  探测器VLBI测量时延和时延率误差

    Fig.  12  Formal errors of delay and rate of Prober

    图  13  中继星发射后到探测器月球背面着陆前的中继星时延和时延率测量误差

    Fig.  13  Delay and rate formal errors of Relay satellite between its launching and prober soft-landing

    图  14  “嫦娥4号”中继星任务时延数据定轨后残差统计

    Fig.  14  VLBI delay post-fitting residuals of OD of relay satellite

    图  15  “嫦娥4号”中继星任务时延率数据定轨后残差统计

    Fig.  15  VLBI delay rate post-fitting residuals of OD of relay satellite

    图  16  “嫦娥4号”探测器任务时延数据定轨后残差统计

    Fig.  16  VLBI delay post-fitting residuals of OD of prober

    图  17  “嫦娥4号”探测器任务时延率数据定轨后残差统计

    Fig.  17  VLBI delay rate post-fitting residuals of OD of prober

    图  18  s8614a南山−天马基线中继星定轨后时延残差

    Fig.  18  s8614a Ur-Tm delay residuals after OD

    图  19  带通效应

    Fig.  19  Bandpass effect

    表  1  CCSDS建议的DOR侧音频率

    Table  1  CCSDS recommended DOR tones

    星地链路频段/GHz DOR侧音对 DOR侧音频率近似值/MHz
    S 2 1 4
    X 8 2 4/20
    Ka 32/37 3 4/20/76
    下载: 导出CSV

    表  2  中继星天线在轨标定结果

    Table  2  The result of the antenna pointing calibration of relay satellite in orbit

    日期 观测数 拟后残差/dB X/10-3(°) Y/10-3(°)
    6.16(1) 16 108 0.41 5.7 ± 0.4 -40.2 ± 0.4
    6.16(2) 16 553 0.11 9.5 ± 1.2 -23.0 ± 1.1
    6.17 17 284 0.27 2.9 ± 0.6 -37.1 ± 1.1
    6.22 7 627 0.20 95.7 ± 1.0 -57.6 ± 0.9
    6.29 5 322 0.61 54.3 ± 0.7 -22.9 ± 0.8
    7.05 4 432 0.44 56.2 ± 0.7 -41.8 ± 0.7
    11.09 1 161 0.45 17.0 ± 1.2 -36.0 ± 1.2
    下载: 导出CSV
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  • 收稿日期:  2020-05-20
  • 修回日期:  2020-06-25
  • 网络出版日期:  2020-09-25

“嫦娥4号”高精度VLBI测轨技术

doi: 10.15982/j.issn.2095-7777.2020.20200026
    基金项目:  国家自然科学基金资助项目(11873077)
    作者简介:

    王广利(1965– ),男,研究员,博士生导师,主要研究方向:深空探测射电测量技术、天体测量与空间大地测量。通讯地址:中国科学院上海天文台(200030)电话:(021)34775230 E-mail:wgl@shao.ac.cn

  • ● For the first time,S-band ΔDOR technology was successfully applied to relay satellite orbit measurement. ● Adopt fast task switching mode to take into account the requirements of relay satellite orbit measurement during the orbit measurement of the lander-rover combination prober. ● For the first time,the Tianma 65-meter radio telescope was used to carry out the on-orbit calibration of the relay satellite antenna,and the calibration accuracy was better than the main beam of the relay antenna by 2%.
  • 中图分类号: P135,P164

摘要: “嫦娥4号”在国际上首次实现了月球背面软着陆和巡视勘察。“嫦娥4号”中继星任务中首次创新性使用S波段ΔDOR测量技术,自主研制了S波段ΔDOR观测数据处理系统;探测器任务期间,首次实现了VLBI系统分时快速转换观测中继星和探测器;利用天马射电望远镜对中继星天线进行了在轨指向标定。深入分析了VLBI需要解决的主要技术问题,提出了具体的解决措施,通过重点对中继星、探测器实时任务期间的测量结果的分析,得出这些技术手段对任务目标的完成具有重要作用。

注释:
1)  ● For the first time,S-band ΔDOR technology was successfully applied to relay satellite orbit measurement. ● Adopt fast task switching mode to take into account the requirements of relay satellite orbit measurement during the orbit measurement of the lander-rover combination prober. ● For the first time,the Tianma 65-meter radio telescope was used to carry out the on-orbit calibration of the relay satellite antenna,and the calibration accuracy was better than the main beam of the relay antenna by 2%.

English Abstract

王广利, 洪晓瑜, 刘庆会, 李斌, 马军, 苏彦, 郝龙飞. “嫦娥4号”高精度VLBI测轨技术[J]. 深空探测学报(中英文). doi: 10.15982/j.issn.2095-7777.2020.20200026
引用本文: 王广利, 洪晓瑜, 刘庆会, 李斌, 马军, 苏彦, 郝龙飞. “嫦娥4号”高精度VLBI测轨技术[J]. 深空探测学报(中英文). doi: 10.15982/j.issn.2095-7777.2020.20200026
WANG Guangli, HONG Xiaoyu, LIU Qinghui, LI Bin, MA Jun, SU Yan, HAO Longfei. High-Precision VLBI Orbit Measurement Technology in the Chang'E-4 Mission[J]. Journal of Deep Space Exploration. doi: 10.15982/j.issn.2095-7777.2020.20200026
Citation: WANG Guangli, HONG Xiaoyu, LIU Qinghui, LI Bin, MA Jun, SU Yan, HAO Longfei. High-Precision VLBI Orbit Measurement Technology in the Chang'E-4 Mission[J]. Journal of Deep Space Exploration. doi: 10.15982/j.issn.2095-7777.2020.20200026
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