Accuracy evaluation of XUST’s global ionospheric products

The ionosphere research team of Xi'an University Science and Technology (XUST) has been committing to high-precision global ionospheric modeling since 2012. agency adopted spherical harmonic functions generate GNSS (Global Navigation Satellite System) product XANG multi-source data fusion XAMG. In this essay, we take International Service (IGS) maps (GIMs) products as a reference verify analyze the accuracy GIMs produced by XUST in detail from three different aspects. internal external evaluation results dSTEC indicate that are consistent with other analysis centers. contrast Jason-2/-3 VTEC, STD between Jason-2 during 2016–2018 is about 2.42–3.11 TECU. Jason-3 2.40–3.11 TECU, which equivalent China Academy Sciences (CAS) Jet Propulsion Laboratory (JPL), better than Center for Orbit Determination Europe (CODE), European Space Operations Agency (ESA) Wuhan (WHU), slightly worse Universitat Politècnica de Catalunya/IonSAT (UPC). Besides, figure out GIM approximately 60% ocean areas significantly improved after adding space-based comparing two developed products. Finally, evaluated performance single-frequency precise point positioning (SF-PPP) convergence time standard PPP reference. terms average time, delay processing capabilities XAMG comparable even ESAG JPLG some regions. accuracy, an constraint XAMG, both ESAG, IGSG, CASG CODG.