DMB信号水汽探测方法若干问题研究

项目名称： DMB信号水汽探测方法若干问题研究

项目编号： No.41505017

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 天文学、地球科学

项目作者： 夏景明

作者单位： 南京信息工程大学

项目金额： 21万元

中文摘要： 大气中水汽的三维分布、水汽垂直输送和相变是影响中尺度天气系统变化的重要动力机制。目前的水汽监测系统观测时空分辨率，设备造价，布网密度和监测精度等方面还有很大的提升空间，尤其是多数观测系统只能进行水汽的“点观测”，缺乏“场观测”资料。DMB（Digital Multimedia Broadcasting）是在世界上广泛布网的商用多媒体广播系统，针对当前水汽监测系统存在的缺陷，本研究利用商用DMB信号构建水汽监测网络的方法，该网络通过DMB信号反演大气折射指数，可以作为现有的水汽监测网络和监测手段的重要补充。同时针对现有的GPS水汽三维层析技术的缺点，将DMB大气折射指数监测技术和GPS水汽三维层析技术相结合，提出基于DMB边界层水汽观测方程的水汽三维层析方法，期望优化当前的边界层水汽层析结果

中文关键词： DMB信号；大气折射指数；边界层；导频追踪；层析

英文摘要： The three-dimensional distribution and vertical transferring of water vapor and phase change are principal driving mechanisms that affect the variation of mesoscale weather systems. Therefore, the formation and evolution of mesoscale severe weather systems can be analyzed accurately through effective retrieve of water vapor information with high accuracy and fine spatial and temporal resolution. This information plays important role for mesoscale disastrous weather forecasting and disaster prevention and mitigation. The existing detection systems for water vapor have many problems, like low spatial and temporal resolution, high cost, sparse network deployment, and poor monitoring accuracy, etc. Moreover, most can only implement “point observation” that is lack of “field observation” information, i.e. horizontal and vertical distribution of water vapor. Construction of water vapor monitoring network with commercial DMB signals is proposed in this dissertation, which aims to overcome the shortages of existing monitoring systems. Atmospheric refraction index is inversed in the network through DMB signals, which can used as significant complementation of current monitoring networks and methods for water vapor. An in-depth research on key technologies and applications of water vapor monitoring system based on DMB signals is carried out in this research...The main work includes: .1.The technical feasibility of DMB signals as the retrieval of atmospheric refraction index will be demonstrated;.2.Three signal processing methods for atmospheric refraction index inversion based on DMB signals will be presented and test.3.Aiming at the shortages of existing GPS water vapor 3D tomography technique, atmospheric refraction index monitoring technology based on DMB and GPS water vapor 3D tomography technique are combined. A water vapor 3D tomography method based on observation equations of DMB boundary layer water vapor will be proposed and test

英文关键词： DMB signal;Atmospheric refraction index;Boundary layer;Pilot tracking;Tomography