Research Log - 2026-05-03 SBAS Service-Provider Source Hardening

Purpose

This log documents the SBAS service-provider source-hardening cycle executed on 2026-05-03. The cycle created an institutional-grade source note for SBAS service providers (WAAS, EGNOS, MSAS, GAGAN, BDSBAS, KASS, SouthPAN) and updated downstream system pages with proper source routing.

Problem statement

The SBAS service-provider source family was not yet represented by a dedicated source note. System pages (WAAS, EGNOS, MSAS, GAGAN, BDSBAS) were in draft/provisional state with in-vault-synthesis-only verification status. Comparative pages (WAAS vs EGNOS, MSAS vs GAGAN) lacked source routing to service-provider material. The Standards Source Matrix listed service-provider definition documents as “Not yet represented consistently.”

Research conducted

WAAS (United States)

• FAA official page: https://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas
• Scope: “WAAS provides service for all classes of aircraft in all phases of flight”
• Real-time status: https://www.nstb.tc.faa.gov/rt_waassatellitestatus.htm

EGNOS (Europe)

• EUSPA/ESA official page: https://egnos.gsc-europa.eu/egnos-system/about-egnos
• Scope: “EGNOS is Europe’s regional satellite-based augmentation system (SBAS)”
• Safety of Life service declared available for aviation: 2 March 2011

MSAS (Japan)

• ESA Navipedia: https://gssc.esa.int/navipedia/index.php/MSAS_General_Introduction
• Operating agency: JCAB, Ministry of Land, Infrastructure, Transport and Tourism
• System evolution linked to Michibiki (QZSS) constellation

GAGAN (India)

• AAI official page: https://www.aai.aero/en/content/what-gagan
• Operating agency: Airports Authority of India (AAI) and Indian Space Research Organisation (ISRO)
• Scope: GPS Aided GEO Augmented Navigation

BDSBAS (China)

• BeiDou official site: http://en.beidou.gov.cn/SYSTEMS/System/
• Operating agency: China Satellite Navigation Office
• Formerly known as Satellite Navigation Augmentation System (SNAS)

KASS (South Korea)

• KARI official page: https://www.kari.re.kr/eng/contents/200
• Scope: “KASS utilizes SBAS technology to reduce GPS positioning errors to within three meters”
• Certified by Korean national authorities and declared operational

SouthPAN (Australia/New Zealand)

• Geoscience Australia official page: https://www.ga.gov.au/scientific-topics/positioning-navigation/positioning-australia/about-the-program/southpan
• Operating agency: Geoscience Australia and Toitu Te Whenua Land Information New Zealand
• Services: L1 SBAS, DFMC SBAS, Precise Point Positioning Via SouthPAN (PVS)

Files created

1. Sources/Source - SBAS Service Providers.md — NEW institutional source note with official source signals for all 7 SBAS systems, boundary statements, downstream routing, and extraction template

Files modified

2. Systems/WAAS.md — UPDATED: added source anchors section linking to service-provider source note
3. Systems/EGNOS.md — UPDATED: added source anchors section
4. Systems/MSAS.md — UPDATED: added source anchors section
5. Systems/GAGAN.md — UPDATED: added source anchors section
6. Systems/BDSBAS.md — UPDATED: added source anchors section
7. Syntheses/WAAS vs EGNOS.md — UPDATED: added source anchors and updated next-source-support targets
8. Syntheses/MSAS vs GAGAN.md — UPDATED: modified date
9. MOCs/SBAS-Systems-by-Region-MOC.md — UPDATED: modified date
10. MOCs/SBAS-Research-MOC.md — UPDATED: modified date
11. Standards-Regulation/SBAS Standards Source Matrix.md — UPDATED: added service-provider source note to claim-routing matrix and claim-type matrix
12. Sources/SBAS Source Backlog.md — UPDATED: marked service-provider item as completed; updated suggested execution order

Boundary decisions

1. Single consolidated source note: All 7 SBAS systems covered in one source note (Source - SBAS Service Providers) following the pattern of the FAA/EASA TSO/ETSO and procedure-design source notes.

2. Verification status: The new source note uses public-catalog-reviewed-not-source-extracted to signal that public catalog metadata supports system identity and operating agency, but direct service-provider document extraction has not been performed.

3. System pages: WAAS, EGNOS, MSAS, GAGAN, BDSBAS pages remain in draft/provisional state with in-vault-synthesis-only verification status. Source routing has been added but claims are not yet verified.

4. No KASS or SouthPAN system pages: These systems are referenced in the service-provider source note but do not have dedicated system pages in the vault. Future cycles could create them if needed for ASEAN/regional analysis.

Recommended next cycles

1. Direct extraction of WAAS service definition: Extract FAA WAAS service scope, coverage, and availability claims.
2. Direct extraction of EGNOS service definition: Extract EUSPA/ESA EGNOS service scope, coverage, and availability claims.
3. Direct extraction of other service-provider documents: MSAS (JCAB), GAGAN (AAI/ISRO), BDSBAS (BeiDou), KASS (KARI), SouthPAN (GA/LINZ).
4. Annex 10 direct extraction: Continue extracting ICAO Annex 10 Volume I GNSS/SBAS technical provisions.
5. Country/regional source hardening: Continue ASEAN branch source hardening with verified service-provider data.

Related notes

• SBAS Standards Source Matrix
• SBAS Source Backlog
• Source - SBAS Service Providers
• WAAS
• EGNOS
• MSAS
• GAGAN
• BDSBAS
• KASS
• SouthPAN
• WAAS vs EGNOS
• MSAS vs GAGAN
• SBAS-Systems-by-Region-MOC