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Open AccessArticle

Properties Analysis of Lunar Regolith at Chang’E-4 Landing Site Based on 3D Velocity Spectrum of Lunar Penetrating Radar

by Zejun Dong 1,2, Xuan Feng 1,2,3,*, Haoqiu Zhou 1,2, Cai Liu 1,4, Zhaofa Zeng 1,4, Jing Li 1,3 and Wenjing Liang 1,2
1
College of Geo-Exploration Science and Technology, Jilin University, No.938 Xi MinZhu Street, Changchun 130026, China
2
Science and Technology on Near-Surface Detection Laboratory, Wuxi 214035, China
3
Institute of National Development and Security Studies, Jilin University, No.2699 Qianjin Street, Changchun 130012, China
4
Key Laboratory of Geophysical Exploration Equipment, Ministry of Education (Jilin University), No.938 Xi MinZhu Street, Changchun 130026, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(4), 629; https://doi.org/10.3390/rs12040629 (registering DOI)
Received: 18 January 2020 / Revised: 8 February 2020 / Accepted: 12 February 2020 / Published: 13 February 2020
(This article belongs to the Special Issue Remote Sensing in Applied Geophysics)
The Chinese Chang’E-4 mission for moon exploration has been successfully completed. The Chang’E-4 probe achieved the first-ever soft landing on the floor of Von Kármán crater (177.59°E, 45.46°S) of the South Pole-Aitken (SPA) basin on January 3, 2019. Yutu-2 rover is mounted with several scientific instruments including a lunar penetrating radar (LPR), which is an effective instrument to detect the lunar subsurface structure. During the interpretation of LPR data, subsurface velocity of electromagnetic waves is a vital parameter necessary for stratigraphic division and computing other properties. However, the methods in previous research on Chang’E-3 cannot perform velocity analysis automatically and objectively. In this paper, the 3D velocity spectrum is applied to property analysis of LPR data from Chang’E-4. The result shows that 3D velocity spectrum can automatically search for hyperbolas; the maximum value at velocity axis with a soft threshold function can provide the horizontal position, two-way reflected time and velocity of each hyperbola; the average maximum relative error of velocity is estimated to be 7.99%. Based on the estimated velocities of 30 hyperbolas, the structures of subsurface properties are obtained, including velocity, relative permittivity, density, and content of FeO and TiO2. View Full-Text
Keywords: Chang’E-4; lunar penetrating radar (LPR); 3D velocity spectrum; properties analysis Chang’E-4; lunar penetrating radar (LPR); 3D velocity spectrum; properties analysis
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Dong, Z.; Feng, X.; Zhou, H.; Liu, C.; Zeng, Z.; Li, J.; Liang, W. Properties Analysis of Lunar Regolith at Chang’E-4 Landing Site Based on 3D Velocity Spectrum of Lunar Penetrating Radar. Remote Sens. 2020, 12, 629.

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