不同电离层格网产品的精度分析

Analysis the Accuracy of Different Ionospheric Grid Products

利用全球部分IGS站实测数据,精确提取测站天顶方向的总电子含量,以此作为评估基准,对国内外5家分析中心和2家综合中心(IGS,international GNSS service和iGMAS,international GNSS monitoring&assessment system)的全球电离层格网(global ionosphere maps,GIM)产品在全球范围内的符合精度进行评估。结果表明,不同机构不同类型的GIM产品精度在不同范围的符合精度略有不同。

Ionospheric grid provides information about space weather, gives empirical forecast models, and helps improve accuracy of user navigation and positioning. Taking into account the wide applica- tion of ionospheric grid, based on measured data of some IGS stations, this paper assesses the inner accuracy of ionospheric grid products at five centers and two integrated analysis centers （IGS and iG- MAS） worldwide. The results show that there are different accuracy of different types of GIM prod- ucts in different organizations and different ranges.