A Radiometrically Precise Multi-Frequency Ice-Penetrating Radar Architecture

A Radiometrically Precise Multi-Frequency Ice-Penetrating Radar Architecture
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辐射精确的多频透冰雷达架构

DOI:
--
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发表时间:
2022
影响因子:
8.2
通讯作者:
D. Schroeder
D. Schroeder
中科院分区:
工程技术1区
文献类型:
--
作者:
A. Broome;D. Schroeder

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透冰雷达探测器是研究地球冰盖冰层和冰下条件的强大地球物理工具。来自这些仪器的数据对于加强对冰盖动力学和冰盖对全球海平面贡献的理解和建模至关重要。传统上,透冰雷达探测器具有单一中心频率,由于基底材料和粗糙度的混杂效应,其逐脉冲接收功率产生固有的模糊性。根据这些模糊性解释透冰雷达数据需要对冰盖的物理状态进行假设、大规模经验分析或辅助数据。在这里,我们证明了高辐射保真度、窄带、多频雷达探测仪可以通过将频率相关的基底粗糙度特征与频率无关的基底材料特征分开来克服这些问题。我们提出了一种雷达系统架构,具有三个间隔几个数量级的窄频带(中心频率为 1、10 和 100 MHz,每个频带具有 20% 的分数带宽)和高辐射分辨率 (±0.5 dB)。这种架构将使我们能够通过消除透冰雷达数据中基底材料和基底粗糙度的影响,在逐个脉冲的基础上精确地约束冰盖基底条件。
Ice-penetrating radar sounders are powerful geophysical tools for studying the englacial and subglacial conditions of Earth’s ice sheets. Data from these instruments is critical to enhancing understanding and modeling of ice-sheet dynamics and ice-sheet contributions to global sea level. Traditionally, ice-penetrating radar sounders have a single center frequency creating inherent ambiguity in their pulse-by-pulse received power due to the confounding effects of basal material and roughness. Interpreting ice-penetrating radar data in light of these ambiguities requires assumptions about the physical state of the ice sheet, large-scale empirical analyses, or ancillary data. Here, we demonstrate that a high radiometric fidelity, narrowband, multi-frequency radar sounder can overcome these issues by separating the frequency-dependent basal roughness signature from the frequency-independent basal material signature. We present a radar system architecture with three narrow frequency bands spaced orders of magnitude apart (center frequencies of 1, 10, and 100 MHz, each with 20% fractional bandwidth) and high radiometric resolution (±0.5 dB). This architecture will allow us to precisely constrain ice-sheet basal conditions on a pulse-by-pulse basis by disambiguating the effects of basal material and basal roughness in ice-penetrating radar data.
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发表时间: 2019
影响因子: 2.9
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影响因子: 1.7
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DOI: 10.1029/2021jf006296
发表时间: 2021-10
影响因子: 3.9
作者:
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期刊: The Cryosphere
影响因子: --
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