GNSS-R土壤水分遥感的适宜性分析

发布时间：2018-02-03 16:33

本文关键词： GNSS-R 土壤水分镜面反射点分辨率探测深度　出处：《遥感学报》2017年03期 　论文类型：期刊论文

【摘要】：利用GNSS-R(Global Navigation Satellite System-Reflectometry)技术探测土壤水分是近年来一个新兴的研究方向。目前GNSS-R遥感观测中反射信号的接收与处理方式包括单天线与多天线两种模式,面向实际应用需求,GNSS-R遥感正在实现从最初的地基观测向空基、星载观测的转变。在推进GNSS-R土壤水分遥感技术业务化应用的过程中,必须首先进行适宜性分析,确定该技术探测的地理位置、空间分辨率与探测深度,然而目前对此尚未有系统、全面、定量的论述。本文针对适宜性分析中的3个关键因子分别进行理论分析与公式推导,明确相关概念的定义,并实现定量化描述,最终通过实际应用分析进一步诠释其应用价值。对于单天线模式地基观测,以美国板块边界观测计划PBO(Plate Boundary Observatory)土壤水分产品为例,分析镜面反射点的相对位置、第一级Fresnel反射椭圆簇的面积与时间序列土壤水分所代表的探测深度;对于多天线模式,以郑州上街区农田空基观测试验为例,得到基于航迹的栅格土壤水分空间分布并探讨其探测深度。本文能够为未来两种观测模式下地基、空基和星载GNSS-R遥感观测、北斗反射信号遥感,以及GNSS-R在农业、水文、生态等领域的实际应用提供理论指导。
[Abstract]:Using GNSS-R(Global Navigation Satellite System-Reflectometry). Detection of soil moisture is a new research direction in recent years. At present, the receiving and processing of reflected signal in GNSS-R remote sensing observation includes two modes: single antenna and multiple antenna. GNSS-R remote sensing is changing from ground-based observation to space-based and space-borne observation in order to promote the application of GNSS-R soil moisture remote sensing technology. First, the suitability analysis must be carried out to determine the geographical location, spatial resolution and detection depth of the technology. However, there is no systematic and comprehensive approach to this problem. In this paper, the three key factors in suitability analysis are analyzed in theory and formula derivation, the definition of related concepts is clear, and quantitative description is realized. Finally, through the practical application analysis to further explain its application value, for the single antenna mode ground observation. Taking the soil moisture products of the PBO(Plate Boundary observing system as an example, the relative position of specular reflection points is analyzed. The area of the first stage Fresnel reflection elliptic cluster and the depth represented by soil moisture in time series; For the multi-antenna model, the spatial distribution of raster soil moisture based on track is obtained and the depth of detection is discussed by taking the space-based observation experiment of farmland in Shangjie district of Zhengzhou as an example. This paper can be used as the foundation for the future two observation modes. The application of space-based and space-borne GNSS-R remote sensing, Beidou reflection signal remote sensing and GNSS-R in agriculture, hydrology and ecology provides theoretical guidance.
【作者单位】：北京大学遥感与地理信息系统研究所;清华大学水沙科学与水利水电工程国家重点实验室;清华大学水利水电工程系;
【基金】：国家自然科学基金青年科学基金(编号:41501360) 中国博士后科学基金(编号:2015M570109) 中国科学院青藏高原环境变化与地表过程重点实验室开放基金(编号:TEL201503)~~
【分类号】：S152.7;TP79
【正文快照】： 2.清华大学水沙科学与水利水电工程国家重点实验室,北京100084;3.清华大学水利水电工程系,北京100084引用格式:彭学峰,万玮,李飞,陈秀万.2017.GNSS-R土壤水分遥感的适宜性分析.遥感学报,21(3):341 350Peng X F,Wan W,Li F and Chen X W.2017.The suitability analysis of soi

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