基于克立格算法的区域四维电离层电子密度并行反演

项目名称： 基于克立格算法的区域四维电离层电子密度并行反演

项目编号： No.10873029

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 王小亚

作者单位： 中国科学院上海天文台

项目金额： 40万元

中文摘要： 电离层电子密度分布是无线电测量技术进行电离层介质改正和研究电离层、太阳活动以及与其它各圈层活动关系（如地球磁层、大气层、地壳剧烈运动等）的关键。最近十年来，GNSS特别是星载和地基GPS的发展使得GNSS成为快速监测电离层的有效手段，甚至是监测全球电离层的唯一手段。为此我们提出了一种新方法，以国际参考电离层IRI为背景和初值，利用多种GNSS测量，包括空基和地基观测，根据电离层电子密度分布的空间相关特性，应用地学统计学内插算法中的克立格算法，进行三维电离层电子密度改正量反演，并针对GNSS数据量庞大的特点，采用MPI+OpenMP并行计算模型来精确快速解算电离层电子密度分布。这一方法的快速、稳定和高精度不仅为监测电离层活动、研究日地关系以及与地球各圈层活动的关系具有重要的科学意义，而且在卫星导航、无线电通信、空间天气监测和预报、深空探测卫星轨道确定等方面也有着重要实际应用价值

中文关键词： GNSS；IRI；电子密度；克立格算法；并行计算

英文摘要： The electron density distribution of ionosphere is the key to correct the ionosphere delay for radio measurement techniques, and study solar activities and its relation with other spheres such as the magnetosphere of the earth, the atmosphere, and the crustal severe activities and so on. During recent decade with the rapid development of space-based and ground-based GPS, GNSS has gradually become a kind of valid tools to quickly and efficiently monitor the ionosphere, even a unique tool to monitor the global ionosphere. Therefore, we put forward a new method to monitor the four dimension electron density distribution accurately and rapidly. Its characteristics can be summarized as follows: (1) employ the International Reference Ionosphere (IRI) as the initial background field; (2) make use of various GNSS measurements including spaced-based and ground-based GNSS observations; (3) apply the Kriging algorithm according to the space distribution characteristics of ionosphere electronics density; (4) and also adopt MPI+OpenMP parallel algorithm to solve the massive data process problems. This method is fast, stable and with high accuracy, which not only has an important scientific meaning to detect the ionosphere activity, investigate the relation between the sun and the earth, and study their relation with other spheres, but also has a practical application value in satellite navigation, wireless communication, space weather monitoring and forecast, the orbit determination in deep space probe and so on.

英文关键词： GNSS; IRI; Ionosphere Electron Density; Kriging Algorithm; Parallel Algorithm