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  

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

作　　者：吴学睿[1,2,3] 夏俊明 白伟华 张兴刚 WU Xuerui;XIA Junming;BAI Weihua;ZHANG Xinggang(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)

机构地区：[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

出　　处：《测绘学报》2019年第8期1059-1066,共8页Acta Geodaetica et Cartographica Sinica

基　　金：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。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.

关 键 词：GNSS-R/IR 冻融地表 延迟多普勒图 多路径 双站全极化 

分 类 号：P237[天文地球—摄影测量与遥感]