title: Ionospheric correction based on ingestion of global ionospheric maps into the NeQuick 2 model.
abstract: The global ionospheric maps (GIMs), generated by Jet Propulsion Laboratory (JPL) and Center for Orbit Determination in Europe (CODE) during a period over 13 years, have been adopted as the primary source of data to provide global ionospheric correction for possible single frequency positioning applications. The investigation aims to assess the performance of new NeQuick model, NeQuick 2, in predicting global total electron content (TEC) through ingesting the GIMs data from the previous day(s). The results show good performance of the GIMs-driven-NeQuick model with average 86% of vertical TEC error less than 10 TECU, when the global daily effective ionization indices (Az) versus modified dip latitude (MODIP) are constructed as a second order polynomial. The performance of GIMs-driven-NeQuick model presents variability with solar activity and behaves better during low solar activity years. The accuracy of TEC prediction can be improved further through performing a four-coefficient function expression of Az versus MODIP. As more measurements from earlier days are involved in the Az optimization procedure, the accuracy may decrease. The results also reveal that more efforts are needed to improve the NeQuick 2 model capabilities to represent the ionosphere in the equatorial and high-latitude regions.
authors: School of Electronic Information, Wuhan University, No. 129 Luoyu Road, Wuhan 430079, China ; China Research Institute of Radiowave Propagation, No. 36 Xianshandong Road, Qingdao 266107, China.
authors: Xiao
authors: X
authors: Yu
authors: University of Chinese Academy of Sciences, Beijing 100029, China ; Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
authors: Chengli
authors: C
authors: She
authors: School of Electronic Information, Wuhan University, No. 129 Luoyu Road, Wuhan 430079, China ; China Research Institute of Radiowave Propagation, No. 36 Xianshandong Road, Qingdao 266107, China.
authors: Weimin
authors: W
authors: Zhen
authors: The Abdus Salam International Center for Theoretical Physics, T-ICT4D Laboratory, 34100 Trieste, Italy.
authors: Nava
authors: N
authors: Bruno
authors: China Research Institute of Radiowave Propagation, No. 36 Xianshandong Road, Qingdao 266107, China.
authors: Dun
authors: D
authors: Liu
authors: The Constellation Observing System for Meteorology, Ionosphere, and Climate Program Office, University Corporation for Atmospheric Research, Boulder, CO 80303, USA.
authors: Xinan
authors: X
authors: Yue
authors: School of Electronic Information, Wuhan University, No. 129 Luoyu Road, Wuhan 430079, China ; China Research Institute of Radiowave Propagation, No. 36 Xianshandong Road, Qingdao 266107, China.
authors: Ming
authors: M
authors: Ou
authors: School of Electronic Information, Wuhan University, No. 129 Luoyu Road, Wuhan 430079, China.
authors: Jisheng
authors: J
authors: Xu