基于GPS信号的土壤湿度反演研究

项目名称： 基于GPS信号的土壤湿度反演研究

项目编号： No.61271363

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 王利恒

作者单位： 武汉工程大学

项目金额： 55万元

中文摘要： 土壤湿度是气象学、土壤学、水文学、生态学、精准农业等领域都关注的重要变量，已引起我国政府和科技界的高度重视。传统的土壤湿度监测手段存在时效性差、自动化水平低、实施成本高等缺点。基于GPS的遥感是一种全新概念的技术，国外早已开始对其进行研究，并成功应用于海洋和冰层探测。研究结果表明：遥感土壤湿度的最佳电磁波波长在0.1m～0.3m之间，GPS信号波长正好在此范围。本项目拟借鉴基于GPS的海洋遥感原理和方法，进行基于GPS信号的土壤湿度反演研究。通过分析土壤反射特性对GPS信号的影响，结合现代数字信号处理方法获取反射GPS信号的特性；在此基础上利用神经网络等智能算法研究反射GPS信号的归一化功率与土壤湿度之间的关系，以此为指示因子建立土壤湿度反演模型；找出影响反演模型的因素，提高基于GPS反射信号反演土壤湿度的精度。该项目的完成将为实际应用GPS进行土壤湿度遥感研究打下理论基础。

中文关键词： 土壤湿度；GPS遥感；反演；归一化功率；

英文摘要： Soil moisture is the key parameter been concerned in meteorology,pedology,hydrology,ecology and precision agriculture. It has been drawn great concern of our govenment and scientific and technological circles. The traditional monitor approach of soil moisture has some shortcomings such as timeliness sent, low level of automatization, high cost of implementation. The GPS remote sensing is a new concept technology which has been researched early abroad, it has been successfully applyed in oceans and ice layer detection. The research result indicated the optimum electromagnetic wave for soil moisture remote sensing is between 0.1 and 0.3 meter which is the band of GPS signal. This project plane to inversion research the soil moisture based on the GPS signal used for reference the application of GPS for ocean remote sensing. By means of analyse soil reflected feature affecting on GPS signal, incorporation modern digital signal processing approach to get the reflected features of GPS signal. Meanwhile research the relation between soil moisture and normalized power of GPS reflected signal by means of inellectual method such as neural network. Use the relation as a indicator,we can setup the inversion model of soil moisture, and find the influencing factor of inversion model to improve measure precision of the soil

英文关键词： Soil moisture；GPS remote sensing；inversion；normalized power；