Trajectory Recovery and Terrain Reconstruction Based on Descent Images under Dual-Restrained Conditions: Tianwen-1

Remote Sensing

Shaochuang Liu¹  Yongzhe Yan¹  Youqing Ma¹  Jianli Zhang²  Minglei Li³  Yaming Xu⁴  Huan Yang⁴  Chen Qi⁴  Xinchao Xu⁵  Aigong Xu⁵ 

[1] Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China;Beijing Institute of Spacecraft System Engineering, Beijing 100094, China;College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China;School of Geodesy and Geomatics, Wuhan University, Wuhan 430072, China;School of Mapping and Geographical Science, Liaoning Technical University, Fuxin 123000, China;

关键词: Tianwen-1;    descent image;    dual-restrained;    trajectory recovery and terrain reconstruction (TR-TR);    plane induced parallax;    degenerate plane;   

DOI  :  10.3390/rs14030709

来源: DOAJ

【 摘 要 】

Tianwen-1 is the first Mars probe launched by China and the first mission in the world to successfully complete the three steps of exploration (orbiting, landing, and roving) at the one time. Based on the unverifiable descent images which cover the full range of the landing area, trajectory recovery and fine terrain reconstruction are important parts of the planetary exploration process. In this paper, a novel trajectory recovery and terrain reconstruction (TR-TR) algorithm employing descent images is proposed for the dual-restrained conditions: restraints of the flat terrain resulting in an unstable solution of the descent trajectory and of the parabolic descent trajectory causing low accuracy of terrain reconstruction, respectively. A landing simulation experiment on a landing field with Mars-like landform was carried out to test the robustness and feasibility of the algorithm. The experiment result showed that the horizontal error of the recovered trajectory didn’t exceed 0.397 m, and the elevation error of the reconstructed terrain was no more than 0.462 m. The algorithm successfully recovered the descent trajectory and generated high-resolution terrain products using in-orbit data of Tianwen-1, which provided effective support for the mission planning of the Zhurong rover. The analysis of the results indicated that the descent trajectory has parabolic properties. In addition, the reconstructed terrain contains abundant information and the vertical root mean square error (RMSE) of ground control points is smaller than 1.612 m. Terrain accuracy obtained by in-orbit data is lower than that obtained by field experiment. The work in this paper has made important contributions to the surveying and mapping of Tianwen-1 and has great application value.

【 授权许可】

Unknown