摘要
太阳活跃期受太阳风高能粒子影响易发生磁暴,使得电离层总电子含量异常扰动,其非平稳性与非线性特征较平静期明显增强。分别利用2011年区域内多个测站的实测数据与IGS(International GNSS Service)发布的全球电离层模型(global ionosphere model,GIM)进行逐点建模,选取db4小波基对样本序列进行分解后,采用时间序列模型对各分量进行预报并重构,实现对ARIMA(auto regressive integrated moving average)模型的改进。通过分析ARIMA模型与改进模型预报值的残差比例和实验区域内均方根误差的分布情况,来评定改进模型的预报精度与适用性。结果表明,改进模型的残差与实验区域内的均方根误差较ARIMA模型总体减小,且该模型对区域内均方根误差峰值能起到较大的削弱作用。
In the solar active period,the earth’s magnetic field is easily affected by the high energy particles of the solar wind,which makes the total electron content of the ionosphere abnormally disturbed,and its non-stationary and nonlinear characteristics are obviously enhanced compared to the calm period.Using the measured data from multiple stations in the 2011 region and the GIM(global ionosphere model)published by the IGS(International GNSS Service)to perform point-by-point modeling,the db4 wavelet basis is used to decompose the sample sequence,and the time series model is used to forecast each component and forecast.Each component is reconstructed so that the ARIMA(auto regressive integrated moving average)model can be improved.The prediction accuracy and applicability of the improved model are evaluated by analyzing the residual ratio of the ARIMA model and the improved model and the distribution of the root mean square error in the experimental region.The results show that the residual error of the improved model and the root mean square error in the experimental area are reduced compared with the ARIMA model,and the improved model can greatly weaken the peak value of the root mean square error in the area.
作者
刘立龙
陈雨田
黎峻宇
田祥雨
贺朝双
LIU Lilong;CHEN Yutian;LI Junyu;TIAN X iangyu;HE Chaoshuang(College of Geomatics and Geoinformation,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Spatial Information and Geomatics,Guilin 541004,China)
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2019年第12期1757-1764,共8页
Geomatics and Information Science of Wuhan University
基金
广西八桂学者团队资助项目
国家自然科学基金（41664002,41704027）
广西空间信息与测绘重点实验室基金（16-380-25-27）
广西高校（教育厅中青年能力提升项目）科研项目（KY2016YB189,2017KY0267）~~
关键词
VTEC预报
地磁指数
小波分解
时间序列
短期预报
区域电离层
VTEC forecast
geomagnetic index
wavelet decomposition
time series
short-term prediction
regional ionospheric
