Abstract
In this paper, the investigation of the ionospheric models for GNSS (Global Navigation Satellite System) in local area like Japan is presented. The ionospheric delay is modeled applying SCHA (Spherical Cap Harmonic Analysis). It is well known that the ionosphere varies according to solar activity. Therefore, ionospheric effect on GNSS positioning varies with not only the position but also the local time, and it has a periodicity. The purpose of this research is to investigate the periodic characteristics of the ionosphere are investigated by utilizing the SCHA model. Furthermore, based on the above investigation, the capability for ionospheric model prediction is discussed.
