Analysis of Ionosphere Modeling Accuracy Based on Multi-GNSS Data

Satellite navigation has stepped into the era of multi-GNSS and multi-frequencies; it has brought new opportunities for ionosphere modeling. This paper studied the methods and principles of ionosphere modeling based on multi-GNSS, meanwhile developed the corresponding software. Experiments of ionosphere modeling, using 15 degree and 15 order spherical harmonics model, were carried out based on multi-GNSS observation data from day 210 to 216 at 2013. The results show that: the residual of the global ionosphere modeling is less than 3 TECU; the difference of STD is about 4 TECU, compared with the CODE’s final product; the stability of DCB product is better than 0.4 ns for satellite, 0.8 ns for receiver.