适用于不同尺度区域的Klobuchar-like电离层模型

导航定位中运用最广泛的电离层修正模型是Klobuchar模型,但经典的Klobuchar模型不能满足日益增长的导航定位精度的需求,因此不同的精化模型被提出。本文利用GIMs分析了夜间电离层随地方时的变化和电离层电子总含量随纬度的变化情况,在对各种适用范围较广的模型精化方案进行归纳总结的基础上,提出了一种适用于不同尺度区域的Klobuchar-like模型,并利用不同太阳活动时期不同季节的GIMs建立了适用于单站、大区域和全球的Klobuchar-like模型、14参数Klobuchar模型和8参数Klobuchar模型。Klobuchar-like模型单站、区域、全球的修正率分别达到了92.96%、91.55%、72.67%,均高于14参数、8参数Klobuchar模型和GPS Klobuchar模型,表明了该模型的有效性与实用性。

Klobuchar-like Ionospheric Model for Different Scales Areas

Nowadays, Klobuchar is the most widely used ionospheric model in the positioning based on single-frequency terminal, and its different refined models have been proposed for a higher and higher accuracy of positioning.The variation of nighttime TEC with local time and the variation of TEC (total electron content) with latitude have been analyzed using GIMs.After summarizing the model refinement schemes with wide applications, we proposed a Klobuchar-like model for regions with different scales in this paper.The Klobuchar-like, 14-paramaters Klobuchar and 8-paramaters Klobuchar models were established for the small, large and global regions by GIMs (global ionospheric maps) in different solar activity periods and seasons, respectively.Klobuchar-like models, with the correction rates of 92.96%, 91.55% and 72.67% respectively in the small, large and global regions, have higher correction rates than 14-paramaters Klobuchar,8-paramaters Klobuchar and GPS Klobuchar models, which have verified the effectiveness and practicability of Klobuchar-like model.