基于电离层线状变化特征的电离层建模方法  

An Ionospheric Modeling Method Based on Ionospheric Linear Variation Characteristics

作　　者：褚睿韬 姚宜斌[1] 孔建[2] CHU Ruitao;YAO Yibin;KONG Jian(School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;Chinese Antarctic Center of Surveying and Mapping,Wuhan University,Wuhan 430079,China)

机构地区：[1]武汉大学测绘学院,湖北武汉430079 [2]武汉大学中国南极测绘研究中心,湖北武汉430079

出　　处：《测绘地理信息》2022年第5期17-21,共5页Journal of Geomatics

基　　金：国家自然科学基金(41874033,41804038)

摘　　要：电离层变化主要受太阳活动和地磁活动的影响,研究发现受到地磁场作用,电离层内部电子在特定线状特征上的变化具备一定规律性,如经度方向的规律性强于纬度方向。基于此,提出了一种基于电离层线状变化特征的建模方法,选择具备特定地理位置约束(经线方向、纬线方向、磁力线方向)的站点,引入电离层高阶梯度变化,估计待求点电离层电子含量信息。实验结果表明,在DOY172地方时14时,地磁经度带和地理经度带的误差均值和标准差最优结果比地理纬度带的结果分别减小了72%、62%。从2014年整年来看,线性建模误差均值和标准差最优结果比面状建模误差均值和标准差分别减小了82%、49%。The ionospheric is mainly affected by solar activity and geomagnetic activity.It is found that under the effect of the geomagnetic field,the ionospheric internal electron variations in specific line characteristics have a certain regularity,for example,the regularity is stronger in the longitude direction than that in the latitude direction.On this basis,we propose a modeling method based on the linear variation characteristics of the ionospheric.We select some sites with specific geographical constraints(longitude direction,latitude direction,magnetic field line direction),and introduce the high-degree variation of the ionospheric to estimate the ionospheric electron content information at the desired point.The experimental results show that,at local time 14:00,DOY172,the optimal mean error and the optimal standard deviation of longitude zone and geographical longitude zone are reduced by72%and 62%,respectively,compared with those of geographical latitude zone.In 2014,the optimal mean error and the optimal standard deviation of linear modeling decreased by82%and 49%,respectively,compared with those of planar modeling.

关 键 词：高阶梯度电离层变化 线状电离层模型 电离层建模 斜路径总电子含量(slant total electron content STEC) 

分 类 号：P228.4[天文地球—大地测量学与测量工程]