测月雷达数据驱动的嫦娥四号着陆区研究综述
A review of lunar penetrating radar data-driven research in the Chang'e-4 landing area
摘要
Abstract
The Chang'e-4 lunar penetrating radar(LPR)has achieved the first in-situ high-resolution detection of the shallow subsurface structure on the far side of the Moon,filling a critical gap in our understanding of the lu-nar far side's subsurface architecture.This paper systematically reviews and synthesizes previous studies on the stratigraphic structure,dielectric property distribution,and genetic evolution mechanisms within the Von Kármán crater located in the South Pole-Aitken Basin.The analysis is based on dual-channel high-frequency(500 MHz)and low-frequency(60 MHz)radar data acquired by the Yutu-2 rover,integrated with multi-source remote sensing information. Regarding the shallow structure(0-40 m),this study consolidates high-frequency radar results and summarizes a five-layer stratigraphy:the top layer(0-12 m)consists of fine-grained regolith(εr=2.35±0.20,density=1.31±0.20 g/cm3),underlain by three layers of coarse-grained ejecta from the Finsen impact(εr=3.2-4.8),with fragmented basaltic rock at the base.It is particularly noted that buried craters 150-270 m in diameter and five thin lava flow sequences,each 2-3 m thick,were identified at depths of 10-25 m,confirming the superposition of mul-tiple impact and eruption events.For the deeper structure(>50 m),findings reveal four basalt flow units(individual thickness:12-100 m)interlaid with two paleo-regolith layers(20 m/5 m).Volcaniclastic rocks detected beyond 280 m depth provide evidence of late-stage volcanic activity on the lunar far side. Dielectric property inversion demonstrates significant vertical heterogeneity:the relative permittivity in-creases from 2.4-3.2 at the surface to 5.0 at depth,with a loss tangent ranging between 0.004 1-0.010 4,and FeO+TiO2 content reaching up to 17.5 wt%.A generalized"permittivity-depth"function model has been estab-lished,improving inversion accuracy by 35%compared to conventional models.Genetic analysis identifies three dominant mechanisms:early(～3.5 Ga)basaltic eruptions forming the material foundation;mid-stage(～3.2-3.1 Ga)impact events(e.g.,Finsen)depositing ejecta;and later space weathering leading to surface fining. Existing research has established a relatively complete radar profile model for the Chang'e-4 landing site and put forward a three-stage evolution theory of"impact ejecta-volcanic deposition-weathering modification",thereby providing a critical scientific basis for lunar geochronology and landing site selection for deep space exploration.The relevant achievements underscore the unique value of dual-frequency radar in planetary subsurface sounding,which holds significant implications for guiding the development of next-generation planetary detection technolo-gies.关键词
嫦娥四号/测月雷达/月壤结构/介电常数/雷达反演/冯·卡门撞击坑Key words
Chang'e-4/lunar penetrating radar/lunar regolith/dielectric constant/radar inversion/Von Kármán crater分类
天文与地球科学引用本文复制引用
刘麒,符乐远,赖嘉龙..测月雷达数据驱动的嫦娥四号着陆区研究综述[J].地球与行星物理论评（中英文）,2026,57(5):509-523,15.基金项目
国家自然科学基金资助项目(12363009,12103020) （12363009,12103020）
澳门科学技术发展基金(0021/2024/RIA1,0158/2024/AFJ,0034/2024/AMJ) （0021/2024/RIA1,0158/2024/AFJ,0034/2024/AMJ）
澳门科技大学月球与行星科学全国重点实验室开放基金项目(002/2024/SKL) （002/2024/SKL）
赣州市科技计划青年人才项目(2023CYZ26970) （2023CYZ26970）
江西省研究生创新专项资金项目(YC2024-S529) （YC2024-S529）
江西理工大学研究生创新专项资金项目(XY2024-S212,XY2024-S213) Supported by the National Natural Science Foundation of China(Grant Nos.12363009,12103020),Macao Science and Technology Development Fund(Grant Nos.0021/2024/RIA1,0158/2024/AFJ,0034/2024/AMJ),Open Fund Project of the State Key Labora-tory of Lunar and Planetary Science,Macau University of Science and Technology(Grant No.002/2024/SKL),Ganzhou City Sci-ence and Technology Plan Youth Talent Project(Grant No.2023CYZ26970),Jiangxi Province Graduate Student Innovation Spe-cial Fund Project(Grant No.YC2024-S529),and Graduate Student Innovation Special Fund Project of Jiangxi University of Sci-ence and Technology(Grant Nos.XY2024-S212,XY2024-S213) （XY2024-S212,XY2024-S213）
