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Author: search.filters.author.Kenpankho, PrasertSubject: search.filters.subject.IRI TEC

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    GNSS Receiver Bias Model for Near Real Time TEC Monitoring at Low Latitude, Thailand
    (2026-01-01)
    Kenpankho, Prasert
    ;
    Maichuen, Samatchaya
    ;
    Phothila, Prarinya
    ;
    Zhang, Jianfeng
    ;
    Keokhumcheng, Thanapon
    This research proposes and investigates GNSS receiver bias modeling for near real time total electron content (TEC) monitoring across 16 multi-frequency GNSS stations in low latitude, Thailand, from 2022-2024. By applying a refined methodology based on Kenpankho et al. (2021) and integrating IONOLAB-BIAS for single station bias estimation, the research corrects for satellite and receiver inter-frequency biases to enhance TEC accuracy. Results show a consistent upward trend in TEC values, reflecting increased latitudes, seasonal ionospheric activity, and geomagnetic storms. Comparative analysis with the IRI 2020 model using correlation coefficients and RMSE reveals spatial and temporal variation, with near equatorial latitude stations showing strong alignment than upper low latitude stations. The results highlight the importance of localized GNSS-based TEC models for improving satellite positioning accuracy in equatorial regions and highlight the limitations of global models under dynamic ionospheric conditions.
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    The study of total electron content on ionosphere by using single frequency GPS receiver
    (2025-03-01)
    Keokhumcheng, Thanapon
    ;
    Kenpankho, Prasert
    In this research, we studied total electron content (TEC) on ionosphere by using single frequency from global positioning satellite system (GPS) satellite receiver. According to the ionospheric disturbance, ionospheric delay time on TEC is one of the most significant errors in GPS navigation systems. The positioning errors for GPS satellite systems from ionospheric delay depends on TEC over the region of interest as low latitude, Thailand. In research methodology, we proposed our ionospheric delay dataset on the period of the year 2004–2023 into the single frequency TEC method for finding GPS TEC. We investigated single frequency GPS TEC in three different stations, Bangkok, Chiang Mai, and Chumphon. Each station was installed the single and dual frequency GPS receivers for receiving the GPS signals over Thailand region. We investigated and compared single frequency GPS TEC results with dual frequency GPS TEC, International GNSS Service TEC (IGS TEC), and International Reference Ionosphere TEC (IRI TEC) in the year 2023. As the results, TEC using the single frequency GPS receiver is significantly statistical to be use for the study TEC on ionosphere over low latitude, Thailand.