中文摘要：

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。

英文摘要：

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.