Local Mitigation of Higher-Order Ionospheric Effects in DFMC SBAS and System Performance Evaluation

Local Mitigation of Higher-Order Ionospheric Effects in DFMC SBAS and System Performance Evaluation | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Local Mitigation of Higher-Order Ionospheric Effects in DFMC SBAS and System Performance Evaluation Somkit Sophan, Pornchai Supnithi, Lin M. M. Myint, Susumu Saito, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-3182305/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 24 Feb, 2024 Read the published version in GPS Solutions → Version 1 posted 4 You are reading this latest preprint version Abstract Dual-Frequency Muti-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 GNSS data (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: LPV-200 and CAT-I showing promising results. DFMC SBAS higher-order ionospheric effects GNSS single point positioning Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 24 Feb, 2024 Read the published version in GPS Solutions → Version 1 posted Editorial decision: Major revision 23 Jul, 2023 Editor assigned by journal 23 Jul, 2023 Submission checks completed at journal 22 Jul, 2023 First submitted to journal 18 Jul, 2023 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-3182305","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":220707647,"identity":"d65900eb-4c5b-4c5b-b336-b49aad16fc0e","order_by":0,"name":"Somkit Sophan","email":"","orcid":"","institution":"King Mongkut’s Institute of Technology Ladkrabang","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Somkit","middleName":"","lastName":"Sophan","suffix":""},{"id":220707648,"identity":"63defbb5-572c-47ff-8b16-07cfb3ec541d","order_by":1,"name":"Pornchai Supnithi","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA6UlEQVRIiWNgGAWjYLACxgYGHhD1sIFBgoEPInaAKC3MhkAtEmxgoQTCWkCATRJIE9Zizt777MHPHXYyDPxnzCpn5ljUsTEwP/zA+OMOTi2WPcfNDXvPJPMwSOSY3dy4DeQwNmMJhoRnOLUY3Ehjk2ZsYwZq4TG7+RCshcEM6LDDhLTU84AcVgjRwv6NGC2HgSGWY8YIcRgPflsse46xSfa2Hedhk0grlpy5TUIS6MhiiYQ03FrM2dvYJH62Vdvz8x/e+LF3Wx0/P3v7xg8fbPA4DMZggwsxA3ECTg1IWkbBKBgFo2AU4AQAMnJGI2nvhogAAAAASUVORK5CYII=","orcid":"","institution":"King Mongkut’s Institute of Technology Ladkrabang","correspondingAuthor":true,"submittingAuthor":false,"prefix":"","firstName":"Pornchai","middleName":"","lastName":"Supnithi","suffix":""},{"id":220707649,"identity":"3b449f99-0e45-4634-a847-7fe54c39711f","order_by":2,"name":"Lin M. 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The performances of DFMC SBAS using GNSS data (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. 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