基于GIM的Klobuchar电离层模型的精度及影响因素分析  

Precision and Influential Factors Analysis of Klobuchar IonosphericModel Based on GIM on Global Scale

作　　者：林清莹[1] 郭金运[1] 闫金凤[1] 沈毅[1] 李旺[2] 

机构地区：[1]山东科技大学测绘科学与工程学院,青岛266590 [2]河海大学地球科学与工程学院,南京210098

出　　处：《全球定位系统》2016年第5期93-98,共6页Gnss World of China

基　　金：国家自然科学基金(批准号:41374009);山东省自然科学基金(批准号:ZR2013DM009);科技基础性工作专项(编号:2015FY310200)

摘　　要：利用2003年-2014年的GPS广播星历提供的Klobuchar模型的参数,计算得到全球范围内的电离层延迟,以CODE发布的高精度的全球电离层图(GIM)数据作为参考,对Klobuchar模型进行时空精度分析,并探讨太阳活动和地磁活动与模型精度相关性。结果表明:按年份来看,Klobuchar模型精度与太阳活动和地磁活动呈负相关,在太阳和地磁活动剧烈的年份,模型精度较差,反之较好。按月份来看,Klobuchar模型的精度呈现一个半年的周期,在一月份和七月份的精度较高,在四月份和十月份的精度较低。空间上,Klobuchar模型精度在南北半球大致呈现对称分布;在太阳和地磁活动剧烈的年份,在低纬度地区的精度较低,在中高纬度地区精度较高;在太阳和地磁活动平静的年份,模型在全球范围内的精度较好。The Klobuchar model parameters provided by GPS broadcast ephemeris of the year of 2003-2014 were used to calculate the global ionospheric delay,and then analysed the precision of the Klobuchar model by referring high-precision global ionospheric maps（GIM）data issued by CODE,and explore the accuracy of the model correlated with the solar activity and geomagnetic activity.The results showed that Klobuchar model accuracy with solar activity and geomagnetic activity was negatively correlated according to the mean results of years＇ difference value.The period of Klobuchar model＇s precision is six-months and precision of model is higher in January and July and lower in April and October according to the mean results of months＇ difference value.Precision of Klobuchar model presents roughly symmetrical distribution in north-south hemispheres with low precision in the low latitudes and comparatively high precision in the mid-high latitudes in the spatial distribution,in solar and geomagnetic activity calm year,model accuracy are similar on global scale.

关 键 词：KLOBUCHAR模型 GIM 电离层延迟 精度分析 TEC 

分 类 号：P228[天文地球—大地测量学与测量工程]