本文選題：土壤濕度 + GNSS-R　； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：土壤濕度即土壤的含水量,不論在現(xiàn)代化農(nóng)業(yè)還是在全球生態(tài)系統(tǒng)里都扮演著舉足輕重的角色,能夠準(zhǔn)確的測(cè)量和預(yù)測(cè)其值及變化規(guī)律至關(guān)重要。自從20世紀(jì)90年代以來(lái),在全球?qū)Ш叫l(wèi)星系統(tǒng)(Global Navigation Satellite System,簡(jiǎn)稱(chēng)GNSS)基礎(chǔ)之上逐漸發(fā)展起來(lái)的GNSS-R(GNSS-Reflections)技術(shù)成為了研究熱點(diǎn),此項(xiàng)技術(shù)用于測(cè)量表層土壤濕度具有很強(qiáng)的創(chuàng)新性和可操作性。GNSS-R反射信號(hào)理論上能夠?qū)崿F(xiàn)對(duì)大范圍的土壤監(jiān)測(cè)濕度變化,具有傳統(tǒng)方法無(wú)法比擬的優(yōu)越性,最終實(shí)現(xiàn)改良環(huán)境、預(yù)防自然災(zāi)害的目的,然而此領(lǐng)域研究目前主要處于由地基試驗(yàn)逐步向空基實(shí)驗(yàn)過(guò)渡階段。深入研究實(shí)驗(yàn)的原理,找到影響反演精度的所有因素,并開(kāi)發(fā)出一款實(shí)用、方便、快捷兼具實(shí)時(shí)數(shù)據(jù)處理和回放功能的軟件,對(duì)于實(shí)際監(jiān)測(cè)具有重大的意義。本文在綜述國(guó)內(nèi)外GNSS-R技術(shù)研究現(xiàn)狀的基礎(chǔ)上,系統(tǒng)闡述了該技術(shù)的發(fā)展歷程、課題的研究背景、土壤濕度的概念及傳統(tǒng)測(cè)量方法,充分展示了GNSS-R技術(shù)的優(yōu)勢(shì)及發(fā)展前景。在系統(tǒng)分析GNSS-R技術(shù)應(yīng)用于測(cè)量表層土壤濕度原理的基礎(chǔ)上,建立了清晰的反演思路,簡(jiǎn)化了反演過(guò)程,剖析了影響測(cè)量精度的各種因素,針對(duì)這些因素提出了相應(yīng)的改良方法。同時(shí)進(jìn)行了土壤濕度測(cè)量實(shí)驗(yàn),采集了大量GNSS-R相關(guān)功率值數(shù)據(jù),對(duì)數(shù)據(jù)進(jìn)行反演,針對(duì)此條件下特定的影響因素利用上述改良方法修正了反演算法,結(jié)果表明此算法提高了反演精度,并開(kāi)發(fā)出了一款適合于地基情況下具有一定粗糙度的反射面反演軟件,能夠?qū)崟r(shí)采集和顯示各項(xiàng)參數(shù)。
[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.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：S152.7;TN967.1

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