Data Assimilation of Ground-Based GPS and Radio Occultation Total Electron Content for Global Ionospheric Specification

C. Y. Lin, T. Matsuo, J. Y. Liu, C. H. Lin, J. D. Huba, H. F. Tsai, C. Y. Chen

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


This study presents an approach based on the Gauss-Markov Kalman filter to assimilate the total electron content observed from ground-based GPS receivers and space-based radio occultation instrumentations (such as FORMOSAT-3/COSMIC (F3/C) and FORMOSAT-7/COSMIC-2 (F7/C2)) into the International Reference Ionosphere. Observing System Simulation Experiments (OSSEs) show that the data assimilation procedure consisting of the forecast and the measurement update steps can better improve the accuracy of the data assimilation analysis than the assimilation procedure using the measurement update alone. Compared with F3/C, the denser F7/C2 occultation observations can improve the analysis accuracy significantly as suggested by OSSEs. The real data assimilation results are further validated with global ionosphere maps, the global ground-based GPS measurements, and the ionospheric F2 peak height and electron density sounded by ionosondes. Both the OSSEs and validation results confirm that a number of improvements to the data assimilation procedure presented in this paper can indeed be used to reconstruct the three-dimensional ionospheric electron density adequately.

Original languageEnglish
Pages (from-to)10,876-10,886
JournalJournal of Geophysical Research: Space Physics
Issue number10
Publication statusPublished - 2017 Oct

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Fingerprint Dive into the research topics of 'Data Assimilation of Ground-Based GPS and Radio Occultation Total Electron Content for Global Ionospheric Specification'. Together they form a unique fingerprint.

Cite this