Total electron content observations by dense regional and worldwide international networks of GNSS

Takuya Tsugawa, Michi Nishioka, Mamoru Ishii, Kornyanat Hozumi, Susumu Saito, Atsuki Shinbori, Yuichi Otsuka, Akinori Saito, Suhaila M. Buhari, Mardina Abdullah, Pornchai Supnithi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Two-dimensional ionospheric total electron content (TEC) maps have been derived from ground-based Global Navigation Satellite System (GNSS) receiver networks and applied to studies of various ionospheric disturbances since the mid-1990s. For the purpose of monitoring and researching ionospheric conditions and ionospheric space weather phenomena, we have developed TEC maps of areas over Japan using the dense GNSS network, GNSS Earth Observation NETwork (GEONET), which consists of about 1300 stations and is operated by the Geospatial Information Authority of Japan (GSI). Currently, we are providing high-resolution, two-dimensional maps of absolute TEC, detrended TEC, rate of TEC change index (ROTI), and loss-of-lock on GPS signal over Japan on a real-time basis. Such high-resolution TEC maps using dense GNSS receiver networks are one of the most effective ways to observe, on a scale of several 100 km to 1000 km, ionospheric variations caused by traveling ionospheric disturbances and/or equatorial plasma bubbles, which can degrade single-frequency and differential GNSS positioning/navigation. We have collected all the available GNSS receiver data in the world to expand the TEC observation area. Currently, however, dense GNSS receiver networks are available in only limited areas, such as Japan, North America, and Europe. To expand the two-dimensional TEC observation with high resolution, we have conducted the Dense Regional and Worldwide International GNSS TEC observation (DRAWING-TEC) project, which is engaged in three activities: (1) standardizing GNSS-TEC data, (2) developing a new high-resolution TEC mapping technique, and (3) sharing the standardized TEC data or the information of GNSS receiver network. We have developed a new standardized TEC format, GNSS-TEC EXchange (GTEX), which is included in the Formatted Tables of ITU-R SG 3 Data-banks related to Recommendation ITU-R P.311. Sharing the GTEX TEC data would be easier than sharing the GPS/GNSS data among those in the international ionospheric researcher community. The DRAWING-TEC project would promote studies of medium-scale ionospheric variations and their effect on GNSS.

Original languageEnglish
Pages (from-to)535-545
Number of pages11
JournalJournal of Disaster Research
Volume13
Issue number3
DOIs
Publication statusPublished - 1 Jun 2018

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Navigation
Satellites
Electrons
Global positioning system
Earth (planet)
Plasmas

Keywords

  • GNSS
  • Ionosphere
  • Loss-of-lock
  • TEC
  • Total electron content

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Engineering (miscellaneous)

Cite this

Tsugawa, T., Nishioka, M., Ishii, M., Hozumi, K., Saito, S., Shinbori, A., ... Supnithi, P. (2018). Total electron content observations by dense regional and worldwide international networks of GNSS. Journal of Disaster Research, 13(3), 535-545. https://doi.org/10.20965/jdr.2018.p0535

Total electron content observations by dense regional and worldwide international networks of GNSS. / Tsugawa, Takuya; Nishioka, Michi; Ishii, Mamoru; Hozumi, Kornyanat; Saito, Susumu; Shinbori, Atsuki; Otsuka, Yuichi; Saito, Akinori; Buhari, Suhaila M.; Abdullah, Mardina; Supnithi, Pornchai.

In: Journal of Disaster Research, Vol. 13, No. 3, 01.06.2018, p. 535-545.

Research output: Contribution to journalArticle

Tsugawa, T, Nishioka, M, Ishii, M, Hozumi, K, Saito, S, Shinbori, A, Otsuka, Y, Saito, A, Buhari, SM, Abdullah, M & Supnithi, P 2018, 'Total electron content observations by dense regional and worldwide international networks of GNSS', Journal of Disaster Research, vol. 13, no. 3, pp. 535-545. https://doi.org/10.20965/jdr.2018.p0535
Tsugawa, Takuya ; Nishioka, Michi ; Ishii, Mamoru ; Hozumi, Kornyanat ; Saito, Susumu ; Shinbori, Atsuki ; Otsuka, Yuichi ; Saito, Akinori ; Buhari, Suhaila M. ; Abdullah, Mardina ; Supnithi, Pornchai. / Total electron content observations by dense regional and worldwide international networks of GNSS. In: Journal of Disaster Research. 2018 ; Vol. 13, No. 3. pp. 535-545.
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