SBAS Knowledge Base

This site is a structured public reference on Satellite-Based Augmentation Systems (SBAS) for civil aviation. It connects core concepts, aviation operations, standards, regional systems, ASEAN implementation planning, GIPTA 2.0 source material, and empirical ionospheric research.

The knowledge base is written for readers who need more than a glossary: engineers, researchers, regulators, ANSP staff, procedure designers, universities, and implementation teams evaluating how SBAS works and how it could be deployed responsibly.

Start here

Reader need	Best entry point	What you will find
Learn SBAS from zero	What is SBAS	A plain-language but technically careful beginner gateway
Understand the system chain	SBAS Architecture	How reference stations, processing, uplink, broadcast, and receivers fit together
Navigate the whole site	SBAS MOC	Top-level map of concepts, operations, sources, regions, and research
Understand aviation use	SBAS in Civil Aviation MOC	LPV/APV/RNAV context, operational caveats, and source needs
Compare deployed systems	SBAS-Systems-by-Region-MOC	WAAS, EGNOS, MSAS, GAGAN, BDSBAS, and Asia-Pacific implementation patterns
Follow ASEAN work	ASEAN SBAS Adoption Landscape	Regional adoption framing, governance, barriers, demand, and service-model options
Review GIPTA 2.0 material	GIPTA 2.0 MOC	Source-linked ASEAN testbed and implementation pathway material
Check source maturity	SBAS Source Backlog	Standards and evidence gaps that still need direct verification
Explore ionospheric research	SBAS Ionospheric Threat — Empirical Evidence	GNSS-RO/IRI-2020 threat-screening work for Indonesia

What this site is — and is not

This is a living technical knowledge base. It is designed to make SBAS learning and implementation analysis faster, more traceable, and easier to review.

It is not an operational approval document, a certified design manual, or a replacement for ICAO, RTCA, EUROCAE, regulator, ANSP, or service-provider material. Pages distinguish between verified source anchors, source scaffolds, draft synthesis, implementation interpretation, and open research questions.

Core learning path

1. What is SBAS — definition, purpose, scope, and common misunderstandings.
2. SBAS Architecture — the end-to-end augmentation chain and principal system elements.
3. SBAS Architecture Flow — a compact flow diagram for the operational data path.
4. SBAS Integrity — why SBAS is safety-relevant, not just accuracy-enhancing.
5. Protection Levels and Alert Limits — how integrity is expressed for aviation use.
6. SBAS in Civil Aviation MOC — how SBAS connects to approach operations and PBN implementation.
7. SBAS-Standards-Regulation — the current standards map, with caveats and source-backlog links.

Research and implementation branches

ASEAN and GIPTA implementation branch

• ASEAN SBAS Adoption Landscape
• ASEAN SBAS Readiness Heuristic
• ASEAN SBAS Operational Demand Drivers
• ASEAN SBAS Deployment Barriers
• ASEAN SBAS Governance and Institutional Actors
• ASEAN SBAS Service-Model Options
• GIPTA 2.0 MOC
• GIPTA 2.0 and ASEAN SBAS Implementation Pathway
• ASEAN SBAS Testbed to Operational Service

Ionospheric integrity and empirical research branch

• GNSS Radio Occultation
• Total Electron Content (TEC)
• Ionospheric Model Validation
• IRI-2020 vs GNSS-RO Indonesia
• SBAS Ionospheric Threat — Empirical Evidence
• Indonesian SBAS ION Paper Iterations

Source and governance branch

• SBAS Source Backlog
• ASEAN SBAS Source Backlog
• SBAS Knowledge Base Editorial and Source Policy
• Institutional Upgrade Audit 2026-05-01
• Institutional SBAS Knowledge Base Upgrade Roadmap

Current maturity snapshot

Area	Current maturity	Editorial handling
Core SBAS concepts	improving	being upgraded from terminology notes into institutional pillar pages
Standards/source backbone	partial	source scaffolds exist; exact document scope must still be verified where noted
Aviation operations	draft but useful	operational claims require source tightening before being treated as authoritative
ASEAN implementation	strong synthesis layer	supported by GIPTA and regional source scaffolds, with country claims still caveated
Ionospheric research	empirical internal stack	useful for threat discovery; not yet an operational correction or certification model
Publication governance	active	privacy, frontmatter, source, and maturity rules are now explicit

Publication discipline

Before relying on any page, check its frontmatter and caveats. In this site:

• institutional or reviewed means the page is suitable for normal public navigation.
• draft means useful but not yet final.
• source-scaffold-linked means source notes exist but still need deeper verification.
• synthesis-with-caveats means the page interprets multiple sources or notes and preserves uncertainty.

See SBAS Knowledge Base Editorial and Source Policy for the full rule set.