Local Models for Ionospheric VTEC Estimation Based on GR Models and Spherical Cap Harmonic Analysis

摘要

In this paper, ionospheric VTEC (Vertical Total Electron Content) estimation methods based on GNSS Regressive models based on spherical cap harmonic analysis (SCHA) are presented. It is expected that the spherical cap harmonic function can well model the distribution of the VTEC in local area like the sky over Japan. The VTEC estimation results are examined by comparing the precise point positioning (PPP) results applied by the ionosphere corrections produced from the presented VTEC model and the Global Ionosphere Maps (GIMs) provided by the International GNSS Service (IGS).