测绘学报 ›› 2019, Vol. 48 ›› Issue (8): 1059-1066.doi: 10.11947/j.AGCS.2019.20180038

• 摄影测量学与遥感 • 上一篇    下一篇

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

吴学睿1,2,3, 夏俊明4,5, 白伟华4,5,6, 张兴刚7   

  1. 1. 中国科学院上海天文台, 上海 200030;
    2. 上海市空间导航与定位技术重点实验室, 上海 200030;
    3. 中国科学院行星科学重点实验室, 上海 200030;
    4. 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;
    5. 北京市天基空间环境探测重点实验室, 北京 100190;
    6. 中国科学院大学天文学院, 北京 100190;
    7. 中国科学院国家授时中心, 陕西 西安 710600
  • 收稿日期:2018-01-22 修回日期:2018-10-10 出版日期:2019-08-20 发布日期:2019-08-27
  • 作者简介:吴学睿(1981-),女,博士,副研究员,研究方向为GNSS-R遥感原理及应用。E-mail:xrwu@shao.ac.cn
  • 基金资助:
    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)

Theoretical analysis of soil freeze/thaw process on DDM waveform and multipath in order for GNSS-R/IR applications

WU Xuerui1,2,3, XIA Junming4,5, BAI Weihua4,5,6, ZHANG Xinggang7   

  1. 1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China;
    2. Key Laboratory of Space Navigation and Position Technology, Shanghai 200030, China;
    3. Key Laboratory of Planetary Sciences, Chinese Academy of Sciences, Shanghai 200030, China;
    4. National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China;
    5. Beijing Key Laboratory of Space Environment Exploration, Beijing 100190, China;
    6. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100190, China;
    7. National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China
  • Received:2018-01-22 Revised:2018-10-10 Online:2019-08-20 Published:2019-08-27
  • Supported by:
    The National Natural Science Foundation of China (No. 41501384);The National Key Research and Development Program of China (Nos. 2017YB0502800;2017YFB0502802);The Academician Workstation Foundation In Chifeng (No. 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

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.

Key words: GNSS-R/IR, soil freeze/thaw process, delay Doppler map, multipath, bistatic scattering full polarization

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