Local mitigation of higher-order ionospheric effects in DFMC SBAS and system performance evaluation

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dc.contributor.authorSophan, Somkit
dc.contributor.authorSupnithi, Pornchai
dc.contributor.authorMyint, Lin M.M.
dc.contributor.authorSaito, Susumu
dc.contributor.authorHozumi, Kornyanat
dc.contributor.authorNishioka, Michi
dc.date.accessioned2026-08-06T10:45:51Z
dc.date.available2026-08-06T10:45:51Z
dc.date.issued2024-04-01
dc.description.abstractDual-frequency multi-constellation (DFMC) satellite-based augmentation system (SBAS) is a new SBAS standard for aeronautical navigation systems. It supports aircraft navigation from the enroute to approach phases via the L1 and L5 frequencies (1575.42 and 1176.45 MHz). Although the ionosphere-free (IF) combination in the DFMC SBAS operation removes the first-order ionospheric delays in the pseudorange measurement, remaining terms including the satellite-clock offset errors and higher-order ionospheric (HOI) delays are still unaccounted for. The DFMC SBAS accuracy and integrity can be affected by the HOI effects, especially during severe ionospheric disturbances. In this work, we present the local DFMC SBAS corrections with and without the mitigation of HOI delays. We first estimate the HOI delay terms using the received pseudorange followed by separate satellite and receiver bias estimations based on the minimum sum-variance technique. The integrity terms can then be obtained. The performances of DFMC SBAS using the global navigation satellite system (GNSS) data including GPS, Galileo, and QZSS are evaluated using obtained GNSS data at stations in Thailand on the ionospheric quiet and disturbed days. The results show that with the HOI mitigation, the vertical positioning errors (VPE) on the quiet and disturbed days can be improved by 12% and 9%, whereas the vertical protection levels (VPL) are improved by 16% and 21%, respectively. In addition, we perform a preliminary assessment of DFMC SBAS based on the International Civil Aviation Organization (ICAO) requirements of two categories: Localizer Performance with Vertical guidance (LPV-200) and Category I precision approach (CAT-I) showing promising results.
dc.identifier.citationGPS Solutions, 28(2), 2024
dc.identifier.doi10.1007/s10291-024-01614-w
dc.identifier.issn10805370
dc.identifier.other2-s2.0-85185879548
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/15573
dc.sourceGPS Solutions
dc.subjectDFMC SBAS
dc.subjectGNSS
dc.subjectHigher-order ionospheric effects
dc.subjectSingle point positioning
dc.titleLocal mitigation of higher-order ionospheric effects in DFMC SBAS and system performance evaluation
dc.typeArticle

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