本文關(guān)鍵詞： GNSS-R 土壤水分 鏡面反射點 分辨率 探測深度　出處：《遙感學(xué)報》2017年03期 　論文類型：期刊論文

【摘要】：利用GNSS-R(Global Navigation Satellite System-Reflectometry)技術(shù)探測土壤水分是近年來一個新興的研究方向。目前GNSS-R遙感觀測中反射信號的接收與處理方式包括單天線與多天線兩種模式,面向?qū)嶋H應(yīng)用需求,GNSS-R遙感正在實現(xiàn)從最初的地基觀測向空基、星載觀測的轉(zhuǎn)變。在推進GNSS-R土壤水分遙感技術(shù)業(yè)務(wù)化應(yīng)用的過程中,必須首先進行適宜性分析,確定該技術(shù)探測的地理位置、空間分辨率與探測深度,然而目前對此尚未有系統(tǒng)、全面、定量的論述。本文針對適宜性分析中的3個關(guān)鍵因子分別進行理論分析與公式推導(dǎo),明確相關(guān)概念的定義,并實現(xiàn)定量化描述,最終通過實際應(yīng)用分析進一步詮釋其應(yīng)用價值。對于單天線模式地基觀測,以美國板塊邊界觀測計劃PBO(Plate Boundary Observatory)土壤水分產(chǎn)品為例,分析鏡面反射點的相對位置、第一級Fresnel反射橢圓簇的面積與時間序列土壤水分所代表的探測深度;對于多天線模式,以鄭州上街區(qū)農(nóng)田空基觀測試驗為例,得到基于航跡的柵格土壤水分空間分布并探討其探測深度。本文能夠為未來兩種觀測模式下地基、空基和星載GNSS-R遙感觀測、北斗反射信號遙感,以及GNSS-R在農(nóng)業(yè)、水文、生態(tài)等領(lǐng)域的實際應(yīng)用提供理論指導(dǎo)。
[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.
【作者單位】： 北京大學(xué)遙感與地理信息系統(tǒng)研究所;清華大學(xué)水沙科學(xué)與水利水電工程國家重點實驗室;清華大學(xué)水利水電工程系;
【基金】：國家自然科學(xué)基金青年科學(xué)基金(編號:41501360) 中國博士后科學(xué)基金(編號:2015M570109) 中國科學(xué)院青藏高原環(huán)境變化與地表過程重點實驗室開放基金(編號:TEL201503)~~
【分類號】：S152.7;TP79
【正文快照】： 2.清華大學(xué)水沙科學(xué)與水利水電工程國家重點實驗室,北京100084;3.清華大學(xué)水利水電工程系,北京100084引用格式:彭學(xué)峰,萬瑋,李飛,陳秀萬.2017.GNSS-R土壤水分遙感的適宜性分析.遙感學(xué)報,21(3):341 350Peng X F,Wan W,Li F and Chen X W.2017.The suitability analysis of soi

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