Local Ionospheric TEC Maps for DGPS Applications

Abstract

This research work focuses on the ionospheric error correction in Differential Global Positioning System (DGPS) applications over the Indian region by using GAGAN TEC station data. In DGPS, it is assumed that the ionosphere over the reference station and rover is same, reference station computes ionospheric corrections of its own and transmits to the rover. Since the ionosphere over low latitude is active/dynamic spatially, corrections computed by the reference station are not sufficient. Hence, we are proposing instantaneous TEC maps generated by reference station for correcting rover ionospheric errors. In this paper, the local ionosphere variability is predicted using a polynomial model with first order and TEC maps were generated within the latitude and longitude region of 20 × 20. The results show that the first order polynomial is capable of approximating TEC within a DGPS service region.