利用祝融雷达数据在频域上探索火星岩石的介质损耗

IF 2.5 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
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引用次数: 0

摘要

火星岩石是火星探测任务的主要科学目标之一。通过 "祝融 "号探测器携带的漫游穿透雷达,可以对火星次表层进行高分辨率成像,并对火星残积岩的介电性质进行现场测量,这对于加深我们对火星地质和水文演化的了解至关重要。虽然早期的研究已经得出了浅表次表层的介电常数,但要进一步确定次表层材料的特性,还需要确定衰减特性。在本研究中,我们采用了中心点-频率偏移方法,在频域内探索火星碎屑岩的衰减特性。通过整合地下雷达图和导航地形图,详细分析了侧向衰减变化。结果表明,在深度为 4 米的范围内,祝融地表下物质的雷达信号衰减等于损耗正切值 0.0079,标准偏差为 0.001。根据损耗正切值、介电常数和地层特征,我们排除了造山运动主要是火成岩物质的可能性。衰减特性的横向变化可能是由于沿漫游器横向异质分布的硬壳比例的变化造成的。我们的研究结果为了解火星摄岩石及其演变提供了宝贵的信息,为未来的火星采样返回任务提供了重要参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Exploring the dielectric loss of Martian regolith in the frequency domain using Zhurong radar data

Martian regolith is one of the primary science objectives of Mars exploration missions. The Rover Penetrating Radar carried by Zhurong rover allows for high-resolution subsurface imaging and in-situ measurements of Martian regolith dielectric properties, which are crucial to advance our understanding of Martian geology and hydrological evolution. While earlier studies have derived dielectric constants for the shallow subsurface, further characterization of subsurface materials requires the determination of attenuation properties. In this study, we applied the centroid-frequency shift method to explore the attenuation property of the Martian regolith in the frequency domain. Lateral attenuation variation was analyzed in detail by integrating subsurface radargram and navigation terrain images. The results show that, within a depth of ∼4 m, the attenuation of radar signal for Zhurong subsurface material is equal to a loss tangent of 0.0079, with a standard deviation of 0.001. Based on the loss tangent value, dielectric permittivity and ground characterization, we preclude the possibility that the regolith is predominantly igneous materials. The lateral variation of the attenuation property could likely be attributed to changes in the proportion of duricrusts, which are heterogeneously distributed along the rover traverse. Our findings offer valuable information for understanding the Martian regolith and its evolution, serving as a important reference for future Mars sample return missions.

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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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