GNSS导航定位中电离层延迟改正方法

Research on Ionospheric Delay Correction in GNSS Application

GNSS导航定位中电离层延迟是一个主要的误差来源,严重影响着导航定位的精度.因此需寻找一个恰当的电离层延迟改正模型,以削弱电离层误差带来的影响,提高定位精度.详细分析比较了目前常用的几种电离层改正方法,为不同需求用户提供参考.结果表明,基于IRI和Geogiadiou模型的电离层延迟改正结果均在60%以上,而Klobuchar模型在理想情况下可改正掉75%左右的电离层影响.在基于参考站电离层改正方法的几种内插模型中,LIM与LCM精度较高.

The ionospheric delay is a major deviation in GNSS navigation and positioning and has seriously affected the accuracy of application. Therefore, it is urgent to find an appropriate model of the ionosphere delay correction to weaken the influence of the ionosphere error and improve the accuracy of the positioning. This paper makes a detailed analysis and comparison of several com- monly used methods of ionospheric correction to provide a reference for different needs of users. The results show that the ionosphere delay correction based on IRI and Geogiadiou model is more than 60%. However, the Klobuchar model can correct about 75% of the ionospheric effects under ideal conditions. In several interpolation models of ionosphere correction methods based on CORS network, the accuracy of LIM and LCM is higher.