首页 | 本学科首页   官方微博 | 高级检索  
     检索      

电离层预报模型研究
引用本文:李志刚,程宗颐,冯初刚,李伟超,李慧茹.电离层预报模型研究[J].地球物理学报,2007,50(2):327-337.
作者姓名:李志刚  程宗颐  冯初刚  李伟超  李慧茹
作者单位:1.中国科学院国家授时中心, 西安 710600 2 中国科学院上海天文台, 上海 200030 3 中国科学院研究生院, 北京 100049
基金项目:国家自然科学基金(100453001)资助
摘    要:当利用无线电电磁波进行远程通信、卫星导航时,传递信号要受到电离层的影响,因此,对电离层中电子含量的研究显得特别重要.虽然国际上有几种电离层的电子含量预报模型,但其预报只能精确到电子含量的50%~60%.本文提出了一种新的电离层电子含量预报方法:即用球谐函数对IGS(国际GPS服务)所给出的离地面450 km高的球面上的每一网点的电离层电子含量进行拟合,对不同的时间所得到的拟合系数所形成的时间序列用时间序列分析理论中的ARMA(p,q)模型进行预报,从而实现全球的电离层电子含量预报.利用本方法对2004年和2005年IGS所给电离层电子含量资料在地理框架中做了分析预报,5天内电子含量预报相对精度在90%左右.

关 键 词:电离层  电子含量  时间序列  电离层预报  电离层模型  球谐函数  
文章编号:0001-5733(2007)02-0327-11
收稿时间:2006-6-13
修稿时间:2006-06-13

A study of prediction models for ionosphere
LI Zhi-Gang,CHENG Zong-Yi,FENG Chu-Gang,LI Wei-Chao,LI Hui-Ru.A study of prediction models for ionosphere[J].Chinese Journal of Geophysics,2007,50(2):327-337.
Authors:LI Zhi-Gang  CHENG Zong-Yi  FENG Chu-Gang  LI Wei-Chao  LI Hui-Ru
Institution:1.National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China2 Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China 3 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
Abstract:The radio wave used in communications at distance and navigation by satellite is affected by the ionosphere. Therefore the study on the total electron content (TEC) in the ionosphere is very important. There are some prediction models of the ionosphere. But the accuracy of prediction by them is 50%~60% only. A new ionosphere model to predict total electron content is proposed. In this model the total electron content given by IGS at each node of grid is fitted by spherical_harmonic expansion. The fitted coefficients at different times form the time series, which are predicted by the ARMA(p,q) model so as that the prediction of total electron content in the ionosphere is implemented. The TEC data of IGS in 2004 and 2005 are analyzed by our method in order to predict the TEC in the geographic frame. The relative accuracy of prediction for 5 days obtained by our method is about 90%.
Keywords:Ionosphere  Electron content  Time series  Prediction of ionosphere  Ionospheric model  Spherical-harmonic expansion
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《地球物理学报》浏览原始摘要信息
点击此处可从《地球物理学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号