Landing site positioning and descent trajectory reconstruction of Tianwen-1 on Mars

IF 2.7 1区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Astrodynamics Pub Date : 2022-01-04 DOI:10.1007/s42064-021-0121-1

Anran Wang, Li Wang, Yinuo Zhang, Baocheng Hua, Tao Li, Yang Liu, Dayong Lin

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引用次数: 1

Abstract

Tianwen-1 (TW-1) is the first Chinese interplanetary mission to have accomplished orbiting, landing, and patrolling in a single exploration of Mars. After safe landing, it is essential to reconstruct the descent trajectory and determine the landing site of the lander. For this purpose, we processed descent images of the TW-1 optical obstacle-avoidance sensor (OOAS) and digital orthophoto map (DOM) of the landing area using our proposed hybrid-matching method, in which the landing process is divided into two parts. In the first, crater matching is used to obtain the geometric transformations between the OOAS images and DOM to calculate the position of the lander. In the second, feature matching is applied to compute the position of the lander. We calculated the landing site of TW-1 to be 109.9259° E, 25.0659° N with a positional accuracy of 1.56 m and reconstructed the landing trajectory with a horizontal root mean squared error of 1.79 m. These results will facilitate the analyses of the obstacle-avoidance system and optimize the control strategy in the follow-up planetary-exploration missions.

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“天文一号”火星着陆点定位与下降轨迹重建

天文一号(TW-1)是中国首个在一次火星探测中完成绕轨道运行、着陆和巡逻的行星际任务。安全着陆后，对着陆器下降轨迹的重建和着陆器着陆点的确定至关重要。为此，我们采用本文提出的混合匹配方法对TW-1光学避障传感器(OOAS)的下降图像和着陆区域的数字正射影像图(DOM)进行处理，其中着陆过程分为两个部分。首先，利用陨石坑匹配得到OOAS图像与DOM之间的几何变换，计算着陆器的位置;第二步，利用特征匹配计算着陆器的位置。我们计算出TW-1的着陆位置为109.9259°E, 25.0659°N，定位精度为1.56 m，重建了着陆轨迹，水平均方根误差为1.79 m。这些结果将为后续行星探测任务中避障系统的分析和控制策略的优化提供依据。

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来源期刊

Astrodynamics Engineering-Aerospace Engineering

CiteScore

6.90

自引率

34.40%

发文量

期刊介绍： Astrodynamics is a peer-reviewed international journal that is co-published by Tsinghua University Press and Springer. The high-quality peer-reviewed articles of original research, comprehensive review, mission accomplishments, and technical comments in all fields of astrodynamics will be given priorities for publication. In addition, related research in astronomy and astrophysics that takes advantages of the analytical and computational methods of astrodynamics is also welcome. Astrodynamics would like to invite all of the astrodynamics specialists to submit their research articles to this new journal. Currently, the scope of the journal includes, but is not limited to:Fundamental orbital dynamicsSpacecraft trajectory optimization and space mission designOrbit determination and prediction, autonomous orbital navigationSpacecraft attitude determination, control, and dynamicsGuidance and control of spacecraft and space robotsSpacecraft constellation design and formation flyingModelling, analysis, and optimization of innovative space systemsNovel concepts for space engineering and interdisciplinary applicationsThe effort of the Editorial Board will be ensuring the journal to publish novel researches that advance the field, and will provide authors with a productive, fair, and timely review experience. It is our sincere hope that all researchers in the field of astrodynamics will eagerly access this journal, Astrodynamics, as either authors or readers, making it an illustrious journal that will shape our future space explorations and discoveries.