CNES实时电离层产品TEC精度分析

TEC accuracy analysis of the CNES neal-time ionospheric product

电离层延迟是GNSS定位的一个重要误差源。本文阐述了法国空间研究中心(CNES)实时电离层产品的TEC计算方法,分析了CNES实时电离层产品精度。以IGS GIM电离层产品为参考,比较分析了CNES实时电离层产品、Klobu-char模型以及IGS预报电离层产品(C1PG)得到的TEC的偏差,结果表明CNES实时电离层产品结果与IGS GIM很接近,IGS Cl PG产品比IGS GIM略差一些,但两者都明显优于Klobuchar模型之后。将不同模型得到的电离层延迟改正应用于单频伪距单点定位,与无电离层改正的结果相比,定位精度平均提升约32.12%。

Ionospheric delay is an important error source of GNSS positioning.This paper studies the calculation method of total electron content(TEC),and evaluates the accuracy of CNES real-time ionospheric products.Using the IGS GIM ionospheric product as a reference product,the bias of the TEC obtained from the CNES real-time ionospheric product,the Klobu-char model,and the IGS predicted product are compared and anlayzed.The results show that the CNES real-time ionospheric products are very close to IGS GIM,and the IGS C1PG prediction products are slightly worse than IGS GIM,but both of them are significantly better than the Klobuchar model.When applying the ionospheric delay corrections obtained from different models to the pseudo-range single-point positioning,the accuracy is improved by about 32.12%on average compared with that without corrections.