23/12/2025
High-accuracy GNSS without RTK? Yes, it’s possible. 📡
BD-PPP & Galileo HAS deliver decimeter-level positioning—no base station, no internet, no hassle.
Discover how modern PPP is changing the future of surveying.
👉 Read more
📖 Learn how PPP works and why it matters in 2026.
BD-PPP & Galileo HAS: The Future of High-Accuracy GNSS Positioning Without RTK
Updated for modern GNSS users | Ideal for surveying, mapping & geospatial professionals
Introduction: Why High-Accuracy GNSS No Longer Depends on RTK Alone
For years, RTK (Real-Time Kinematic) technology has been the gold standard for centimeter-level GNSS accuracy. However, RTK requires base stations, correction networks, and uninterrupted communication links—making it expensive and unreliable in remote or challenging environments.
This is where Precise Point Positioning (PPP) steps in.
With the arrival of BD-PPP (BeiDou PPP) and Galileo HAS (High Accuracy Service), GNSS users can now achieve sub-meter to decimeter-level accuracy globally—without RTK infrastructure.
In this blog, we explain:
What BD-PPP and Galileo HAS are
How they work
Accuracy and convergence comparison
Why they matter for modern GNSS operations
What Is Precise Point Positioning (PPP)?
Precise Point Positioning (PPP) is a GNSS technique that delivers high-precision results using a single receiver, without requiring a nearby base station.
Key Advantages of PPP
No CORS or base station required
Works globally
Lower operational cost
Ideal for remote and mobile operations
Increasingly faster convergence with modern satellites
Earlier, PPP was considered slow. Today, with improved satellite constellations and advanced error modeling, PPP accuracy and convergence rival RTK in many applications.
How Modern PPP Technology Achieves High Accuracy
Modern PPP systems use:
Multi-constellation GNSS (BDS, Galileo, GPS)
Multi-frequency observations
Precise satellite orbit & clock corrections
Advanced ionospheric and tropospheric models
What This Means for Users
Up to 50% faster convergence
Faster re-convergence after signal loss
Stable positioning in dynamic environments
Reliable results without network dependency
BD-PPP (BeiDou Precise Point Positioning) Explained
BD-PPP is a free PPP service broadcast by the BeiDou-3 satellite constellation.
BD-PPP Performance
Coverage: China & surrounding regions
Convergence Time: 10–15 minutes
Accuracy: Sub-meter level
Cost: Free (broadcast correction)
Best Use Cases
Regional surveying
Infrastructure projects
Agriculture & mapping
Backup when RTK fails
Galileo HAS (High Accuracy Service): Global PPP at Decimeter Level
Galileo HAS is Europe’s official high-accuracy GNSS service, broadcast via Galileo E6-B signals.
Galileo HAS Accuracy & Convergence
Within Europe
Horizontal accuracy: < 20 cm
Vertical accuracy: < 40 cm
Convergence: < 100 seconds
Global Coverage
Horizontal accuracy: < 20 cm
Vertical accuracy: < 40 cm
Convergence: < 300 seconds
Why Galileo HAS Is a Game-Changer
Global coverage
Free broadcast corrections
No internet or radio required
Ideal for international & mobile GNSS users
PPP-RTK: The Best of Both Worlds
Modern GNSS receivers now support PPP-RTK hybrid technology, allowing seamless switching between modes.
How PPP-RTK Helps
RTK accelerates PPP convergence
PPP maintains accuracy when RTK drops
No work stoppage during signal loss
Ideal for urban, forest, or radio-interference areas
This ensures continuous high-precision positioning, even in unstable environments.
How to Use PPP in Real-World Operations
Without Differential Corrections
Enable BDS PPP or Galileo HAS in receiver settings
Place receiver in open sky
Wait for convergence (10–20 minutes)
Start work once PPP FIXED status appears
With RTK Corrections
Operate normally using RTK
If corrections fail, system automatically switches to PPP
Work continues without interruption
⚠️ Tip: Continuous satellite visibility ensures faster convergence and stability.
Why BD-PPP & Galileo HAS Matter in 2025 and Beyond
GNSS technology is shifting toward:
Independence from ground networks
Free satellite-based corrections
Global high-accuracy services
BD-PPP and Galileo HAS represent the future of GNSS—offering reliable, accurate, and cost-effective positioning for professionals worldwide.
