Regional Ionospheric TEC Modeling and Accuracy Analysis Based on Observations from a Station

Abstract

In order to analsis the applicability and accuracy of TEC modelling for regional ionosphere from observations at a single station, the TEC models of 16 single-station regions in Europe are established and the TEC grids of the region are generated based on the spherical harmonic function of order from 2 to 15. The products are compared with the authoritative ionospheric products such as CODE, iGMAS and IGS. The results show that the single station regional ionospheric TEC model based on low order spherical harmonic function (2×2 or 3×3) has the same accuracy as that of global ionospheric TEC such as CODE, iGMAS and IGS, which is about 1.0TECU in the longitude and latitude range of 10×10 (radius < 600km) centered on a single station. Thus, the global ionospheric TEC model can be replaced by the ionospheric TEC model established by a single station in a certain region (radius less than 600 km), and the high-precision ionospheric delay correction can be efficiently provided for the single frequency users in the region.