Abstract The Real-Time Working Group (RTWG) of the International GNSS Service (IGS) is
dedicated to providing high-quality data and high-accuracy products for Global Navigation …

Global navigation satellite systems (GNSS) provide a great data source about the
ionosphere state. These data can be used for testing ionosphere models. We studied the …

The BeiDou-3 system uses the BeiDou Global broadcast Ionospheric delay correction Model
(BDGIM) to describe global vertical total electron content (VTEC) distributions and provide …

Other than traditional single-layer ionosphere models for global navigation satellite system
(GNSS) receivers, the NeQuick-G model of Galileo provides a fully three-dimensional …

The global TEC empirical model established with the TEC grid data of IGS as the
background has poor prediction accuracy in marine areas, and its ability to describe some …

This paper aims to provide an overview on recent advances in ionospheric modeling
capabilities, with the emphasis in the efforts relevant to electron density variability. The …

Abstract In 2012 the Center for Orbit Determination in Europe (CODE) joined the Multi-GNSS-
EXtension project (MGEX) of the International GNSS Service (IGS). Since the end of 2013 …

With the availability of fast computing machines, as well as the advancement of machine
learning techniques and Big Data algorithms, the development of a more sophisticated total …

Generally, dual-and multi-frequency global navigation satellite system (GNSS) users can
use dual-or multi-frequency combinations to eliminate the ionospheric delay. However …

There is a noticeable number of studies carried out on both the operational parameters of
Global Navigation Satellite System (GNSS) and the satellite signal itself. Researchers look …