中文摘要：

目前，我国北斗卫星导航系统已完成星座区域组网，系统每2h提供一组电离层延迟Klobuchar模型参数。利用欧洲定轨中心（CODE）的高精度电离层格网数据作为参考，对北斗卫星导航系统电离层参数性能进行了精度评估分析，并进行了定位分析。数据表明，其修正精度一般在70％以上，北半球的修正误差在1．5m左右，而南半球的修正误差在3．5in左右；在北半球中纬度地区的修正精度比高纬度、低纬度地区高；北斗单频伪距定位采用北斗Klobuchar模型在平面上的精度为3m左右，高程上为7m左右，与采用GPS的Klo—buchar模型相比较，定位精度提高了约10％，高程方向尤为明显。

英文摘要：

At present, China＇s BeiDou Navigation Satellite System （BDS） has completed a constellation of regional network. The system provides a set of ionospheric parameters for the BeiDou Klobuchar model every two hours. Using a high precision GIM model for CODE as a reference, the performance of ionospheric parameters and positioning assessment of BDS are evaluated. The data shows that correction accuracy is generally 70% or more, the correction error in the Northern Hemisphere is about 1.5 meters, and 3.5 meters in the Southern Hemisphere. In the Northern Hemisphere, the correction precision in mid-latitude region is higher than high-latitude and low-latitude region. The precision for BDS SPP on frequency B1 is about 3 meters in the horizontal direction, and about 7 meters in the vertical direction using BDS Klobuchar model. In comparison to use GPS Klobuchar model, precision increased by about 10 percent, especially in the vertical direction.