GNSS-R应用于测量表层土壤湿度及软件设计

发布时间：2018-05-20 16:58

本文选题：土壤湿度 + GNSS-R　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：土壤湿度即土壤的含水量,不论在现代化农业还是在全球生态系统里都扮演着举足轻重的角色,能够准确的测量和预测其值及变化规律至关重要。自从20世纪90年代以来,在全球导航卫星系统(Global Navigation Satellite System,简称GNSS)基础之上逐渐发展起来的GNSS-R(GNSS-Reflections)技术成为了研究热点,此项技术用于测量表层土壤湿度具有很强的创新性和可操作性。GNSS-R反射信号理论上能够实现对大范围的土壤监测湿度变化,具有传统方法无法比拟的优越性,最终实现改良环境、预防自然灾害的目的,然而此领域研究目前主要处于由地基试验逐步向空基实验过渡阶段。深入研究实验的原理,找到影响反演精度的所有因素,并开发出一款实用、方便、快捷兼具实时数据处理和回放功能的软件,对于实际监测具有重大的意义。本文在综述国内外GNSS-R技术研究现状的基础上,系统阐述了该技术的发展历程、课题的研究背景、土壤湿度的概念及传统测量方法,充分展示了GNSS-R技术的优势及发展前景。在系统分析GNSS-R技术应用于测量表层土壤湿度原理的基础上,建立了清晰的反演思路,简化了反演过程,剖析了影响测量精度的各种因素,针对这些因素提出了相应的改良方法。同时进行了土壤湿度测量实验,采集了大量GNSS-R相关功率值数据,对数据进行反演,针对此条件下特定的影响因素利用上述改良方法修正了反演算法,结果表明此算法提高了反演精度,并开发出了一款适合于地基情况下具有一定粗糙度的反射面反演软件,能够实时采集和显示各项参数。
[Abstract]:Soil moisture, that is, soil moisture content, plays an important role in both modern agriculture and global ecosystem. It is very important to accurately measure and predict the soil moisture content. Since the 1990s, the GNSS-RGS-Reflections (GNSS-Reflections) technology, which has been developed on the basis of Global Navigation Satellite system (GNSS), has become a hot research topic. This technique has strong innovation and maneuverability in measuring surface soil moisture. GNSS-R reflectance signal can realize the change of soil moisture in a wide range theoretically, which has the superiority that the traditional method can not compare, and finally realizes the improvement of environment. The purpose of preventing natural disasters is to prevent natural disasters. However, the research in this field is mainly in the stage of transition from ground tests to space-based experiments. It is of great significance to study the principle of the experiment, find out all the factors that affect the inversion accuracy, and develop a practical, convenient and fast software with the functions of real-time data processing and playback. On the basis of summarizing the present research situation of GNSS-R technology at home and abroad, this paper systematically expounds the development course, research background, the concept of soil moisture and the traditional measurement method of GNSS-R technology, and fully demonstrates the advantages and development prospects of GNSS-R technology. Based on the systematic analysis of the principle of GNSS-R technology applied to the measurement of surface soil moisture, a clear inversion idea was established, the inversion process was simplified, and various factors affecting the measurement accuracy were analyzed, and the corresponding improved methods were put forward for these factors. At the same time, the soil moisture measurement experiment was carried out, a large number of GNSS-R related power value data were collected, and the data were retrieved. The inversion algorithm was modified by using the above improved method in view of the specific influencing factors under this condition. The results show that the algorithm improves the inversion accuracy and develops a reflective surface inversion software suitable for the ground condition with certain roughness. The software can collect and display the parameters in real time.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S152.7;TN967.1

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