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High-precision visual localization of the Chang’e-6 lander

  • role： First author第一作者
  • Affiliation：

    Key Laboratory of Remote sensing and Digital Earth, Aerospace information Research institute, Chinese Academy of sciences, Beijing 100101, China

  • Email：liuzq@aircas.ac.cn
  • Introduction：刘召芹，研究方向为行星遥感制图与导航定位。E-mail： liuzq@aircas.ac.cn
LIU Zhaoqin1,  
  • Affiliation：

    Key Laboratory of Remote sensing and Digital Earth, Aerospace information Research institute, Chinese Academy of sciences, Beijing 100101, China

PENG Man1,  
  • Affiliation：

    Key Laboratory of Remote sensing and Digital Earth, Aerospace information Research institute, Chinese Academy of sciences, Beijing 100101, China

DI Kaichang1,  
  • role： Corresponding author通信作者
  • Affiliation：

    Key Laboratory of Remote sensing and Digital Earth, Aerospace information Research institute, Chinese Academy of sciences, Beijing 100101, China

  • Email：wanwh@aircas.ac.cn
  • Introduction：万文辉，研究方向为深空探测遥感与运动平台导航定位。E-mail： wanwh@aircas.ac.cn
WAN Wenhui1*,  
  • Affiliation：

    Key Laboratory of Remote sensing and Digital Earth, Aerospace information Research institute, Chinese Academy of sciences, Beijing 100101, China

LIU Bin1,  
  • Affiliation：

    Key Laboratory of Remote sensing and Digital Earth, Aerospace information Research institute, Chinese Academy of sciences, Beijing 100101, China

WANG Yexin1,  
  • Affiliation：

    Key Laboratory of Remote sensing and Digital Earth, Aerospace information Research institute, Chinese Academy of sciences, Beijing 100101, China

    University of Chinese Academy of Sciences, Beijing 100049, China

XIE Bin12,  
  • Affiliation：

    Key Laboratory of Remote sensing and Digital Earth, Aerospace information Research institute, Chinese Academy of sciences, Beijing 100101, China

    University of Chinese Academy of Sciences, Beijing 100049, China

KOU Yuke12,  
  • Affiliation：

    Key Laboratory of Remote sensing and Digital Earth, Aerospace information Research institute, Chinese Academy of sciences, Beijing 100101, China

    University of Chinese Academy of Sciences, Beijing 100049, China

WANG Biao12,  
  • Affiliation：

    Key Laboratory of Remote sensing and Digital Earth, Aerospace information Research institute, Chinese Academy of sciences, Beijing 100101, China

    University of Chinese Academy of Sciences, Beijing 100049, China

ZHAO Chenxu12,  
  • Affiliation：

    Key Laboratory of Remote sensing and Digital Earth, Aerospace information Research institute, Chinese Academy of sciences, Beijing 100101, China

    University of Chinese Academy of Sciences, Beijing 100049, China

ZHANG Yifan12

Resümee

China’s Chang’e-6 (CE-6), the world’s first lunar farside sample-return mission, successfully landed on the preselected landing site in the Apollo basin inside the South Pole-Aitken basin on June 2, 2024. The high-precision localization of the lander is of considerable importance for supporting engineering operations and scientific studies of the landing site and the returned samples. This study presents the localization techniques and results of the CE-6 lander. Using the Digital Orthophoto Maps (DOMs) produced from images taken by Chang’e-2 (CE-2) and the Lunar Reconnaissance Orbiter Camera (LROC) Narrow Angle Camera (NAC) as base maps, the CE-6 lander has been localized through a visual localization method based on image feature matching between descent images acquired by the lander and the base maps. A new descent image simulation technique has been developed based on orbital base maps and terrain data before landing to automate image matching between descent images and orbital base maps. After landing, descent images are downlinked and lander localization is performed using the developed visual localization method. The location of the CE-6 lander location is determined to be (153.9780°W, 41.6252°S) on the CE-2 base map and (153.9855°W, 41.6384°S) on an LROC NAC base map (Image ID: M166854798LE). The average location of the lander from five LROC NAC base maps is (153.9856°W, 41.6383°S). The location of the high-precision CE-6 lander has been directly supported by engineering operations, and it will be valuable for comprehensive studies on the landing site by using remote sensing data and studies on the provenance of the samples.

Schlüsselwort

remote sensing;Chang’e-6;lander localization;descent camera image;image simulation;image matching

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