| GNSS-R/IR监测地表冻融状态对延迟多普勒波形和多路径数据影响分析 |
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| 引用本文： | 吴学睿,夏俊明,白伟华,张兴刚. GNSS-R/IR监测地表冻融状态对延迟多普勒波形和多路径数据影响分析[J]. 测绘学报, 2019, 48(8): 1059-1066. DOI: 10.11947/j.AGCS.2019.20180038 |
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| 作者姓名： | 吴学睿 夏俊明 白伟华 张兴刚 |
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| 作者单位： | 中国科学院上海天文台,上海 200030;上海市空间导航与定位技术重点实验室,上海 200030;中国科学院行星科学重点实验室,上海 200030;中国科学院国家空间科学中心空间环境探测研究室,北京 100190;北京市天基空间环境探测重点实验室,北京 100190;中国科学院国家空间科学中心空间环境探测研究室,北京 100190;北京市天基空间环境探测重点实验室,北京 100190;中国科学院大学天文学院,北京 100190;中国科学院国家授时中心,陕西 西安,710600 |
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| 基金项目： | 国家自然科学基金青年科学基金（41501384）；国家重点研发计划（2017YFB0502800；2017YFB0502802）；赤峰学院院士专家工作站项目（cfxyys201710） |
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| 摘 要： | 将GNSS-R/IR技术的应用领域拓展到地表冻融状态的监测中,本文利用冻融土混合介质介电常数模型计算土壤介电常数,采用双站全极化相干反射率模型和随机粗糙面散射模型,分别计算了经冻融土反射的GPS相干反射量的镜像反射率,以及GPS非相干反射分量的漫散射特性。模拟分析了冻融转换时,GPS多路径信息(GNSS-IR)以及包含漫散射信号的延迟多普勒图(GNSS-R)的变化特征。理论研究表明冻融转换过程中,地表介电常数的变化导致GPS多路径信息和延迟多普勒图的明显变化。本文从散射机理上揭示了利用GNSS-R和GNSS-IR遥感进行地表冻融特性监测的理论依据。
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| 关 键 词： | GNSS-R/IR 冻融地表 延迟多普勒图 多路径 双站全极化 |
| 收稿时间： | 2018-01-22 |
| 修稿时间： | 2018-10-10 |
Theoretical analysis of soil freeze/thaw process on DDM waveform and multipath in order for GNSS-R/IR applications |
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| WU Xuerui,XIA Junming,BAI Weihua,ZHANG Xinggang. Theoretical analysis of soil freeze/thaw process on DDM waveform and multipath in order for GNSS-R/IR applications[J]. Acta Geodaetica et Cartographica Sinica, 2019, 48(8): 1059-1066. DOI: 10.11947/j.AGCS.2019.20180038 |
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| Authors: | WU Xuerui XIA Junming BAI Weihua ZHANG Xinggang |
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| Affiliation: | (Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;Key Laboratory of Space Navigation and Position Technology,Shanghai 200030,China;Key Laboratory of Planetary Sciences,Chinese Academy of Sciences,Shanghai 200030,China;National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;Beijing Key Laboratory of Space Environment Exploration,Beijing 100190,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100190,China;National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China) |
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| Abstract: | In order to extend the applications GNSS-R/IR(GNSS-reflectometry/interferometric reflectometry) remote sensing technique to soil freeze/thaw process detection, soil(frozen/thawn) mixing permittivity models are employed to calculate the soil permittivity. Bistatic full-polarization coherent scattering model and random roughness surface scattering model are used to calculate the coherent and non-coherent scattering, which result in the variations of GPS multipath observables and DDM(delay Doppler map) waveforms, respectively. When the soil freeze/thaw process occurs, theoretical simulations indicate that soil freeze/thaw process induce the abrupt permittivity changes and affect the obvious variations of GNSS-R/IR signals. In this way, theoretical fundamentals for soil freeze/thaw process detections are presented. |
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| Keywords: | GNSS-R/IR soil freeze/thaw process delay Doppler map multipath bistatic scattering full polarization |
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