中文摘要：

针对传统Klobuchar模型电离层延迟修正精度不高的问题,提出一种新的Klobuchar模型,以提高北斗导航系统的精度。利用欧洲定轨中心CODE的全球格网数据作为参考,使用松弛搜索法分别对覆盖中国区域的格网点和9个测站的观测数据进行算例分析。比较两种方法得出,新模型的修正精度相对于广播模型有大幅提高;新模型预报7d内的电离层时延值修正效果也比广播模型有明显改善;格网点上的平均修正精度从67.89%提高到78.44%,观测数据的平均修正精度从69.81%提升至82.34%。

英文摘要：

Ionospheric delay is the main error of satellite measurement.As the precision of the traditional Klobuchar model is not high,this paper presents a new Klobuchar model that is designed to improve the precision of Beidou satellite navigation systems.We use a GIM model for CODE as a reference and a relax iterative search method to conduct case analysis,including the China region＇s grid points and the observed data from nine stations.By comparing the two models,we find that the new model has a higher correction rate with respect to the broadcast model.Moreover,using the new model to forecast ionospheric delay within one week also has a better correction effect than the broadcast model.Statistical data further shows that the average correction precision improvement on grid points is from 67.89%to 78.44%,and the observed data of different stations from 69.81%to 82.34%.