VTEC Reconstruction of the Ionospheric Grid with Kriging Interpolation

Abstract

In order to solve the ionospheric delay error. In this paper, IGS station data is used for global ionospheric delay modeling by using Kriging interpolation for grid ionospheric VTEC reconstruction. Then the accuracy of the above method is compared with that of CODE product and inverse distance weighted method for reconstructing the ionosphere. The results show that the variance of difference between the above method and the CODE product is within 4TECU and the mean value of the difference is 0.65 TECU. Using Kriging interpolation for grid ionospheric VTEC reconstruction has high precision and the accuracy of the grid value is very close to the final product of the CODE Analysis Center. Compared with the inverse distance weighting method, the Kriging reconstructed ionosphere tends to be truer and the modeling is more accurate in high latitudes. In the mid-latitude and low latitudes, the station is densely distributed, and the Kriging interpolation is more accurate than the inverse distance-weighted interpolation. The accuracy is 0.2 TECU; and in the high latitude area, there are fewer stations, and a part of Kriging interpolation accuracy is improved by 0.3TECU.