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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
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
作者姓名:吴学睿  夏俊明  白伟华  张兴刚
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
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)
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。

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
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
Authors:WU Xuerui  XIA Junming  BAI Weihua  ZHANG Xinggang
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)
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.
Keywords:GNSS-R/IR  soil freeze/thaw process  delay Doppler map  multipath  bistatic scattering full polarization
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