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• W4206043268 abstract "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." @default.
• W4206043268 created "2022-01-26" @default.
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• W4206043268 date "2022-01-04" @default.
• W4206043268 modified "2023-09-22" @default.
• W4206043268 title "Landing site positioning and descent trajectory reconstruction of Tianwen-1 on Mars" @default.
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• W4206043268 doi "https://doi.org/10.1007/s42064-021-0121-1" @default.
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