Learning Resources

GNSS Tutorials

A complete learning path from satellite basics to centimetre-level precision. Follow the path in order or jump straight to any topic.

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Lessons

Suggested Learning Paths

🌱 Complete Beginner

New to GNSS? Start with Foundation and Navigation Basics to understand the essentials.

Start Learning →

🎯 Precision Surveyor

Ready for accuracy? Dive into Centimeter-Level Techniques and Advanced Corrections.

Dive Deeper →

🏭 Industry Professional

Working in the field? Explore Real-World Applications and Sector-Specific Guides.

Explore Applications →

📚 Full Curriculum

Want the complete picture? Take the full learning path from basics to advanced.

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GNSS Raw Signal Observatory

Go beyond theory — watch real satellite signals from your live GNSS receiver. 48-hour rolling graphs of elevation cycles, azimuth sweeps, receiver lock status and carrier-to-noise ratio (C/N₀) for every GPS and Galileo satellite in view. The best way to see why GNSS accuracy depends on where satellites are in the sky.

Elevation vs Time Azimuth sweep Visibility cycles Signal strength C/N₀

Open Live Observatory

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Difficulty: Beginner Intermediate Advanced

GNSS Fundamentals

· 6 lessons START HERE

Start here if you're new to GNSS. These six lessons build the foundation you need for everything that follows.

1.1 What is GNSS? A Simple Introduction to Global Navigation Satellite Systems Beginner 1.2 How GNSS Actually Works: The Principle of Trilateration Beginner 1.3 GNSS vs. GPS: What's the Difference and Why It Matters for You Beginner 1.4 A Clear View of the Sky: Understanding GNSS Satellites and Their Orbits Beginner 1.5 A Brief History of GNSS: From Sputnik to Today Beginner 1.6 How to Choose the Right GNSS Receiver for Your Needs Beginner

Accuracy and Errors

· 7 lessons

Ever wondered why your GPS sometimes sends you the wrong way? This topic explains the science behind GNSS errors and how to minimise them.

2.1 Understanding GNSS Accuracy: From Meters to Centimeters Beginner 2.2 What is GNSS Signal Structure? A Look at Carriers and Codes Intermediate 2.3 The Top 5 Things That Interfere with Your GNSS Signal Beginner 2.4 Multipath Effect: Why Skyscrapers and Canyons Confuse Your GPS Intermediate 2.5 Ionospheric Scintillation: When Solar Storms Disrupt GPS Intermediate 2.6 Urban Canyons: Navigating Cities with GNSS Intermediate 2.7 Signal-to-Noise Ratio (SNR): What It Tells You About Signal Quality Intermediate

High-Precision Techniques

· 8 lessons Recommended: complete Topics 1-2 first

Ready to move beyond smartphone accuracy? These lessons cover the techniques used in surveying, construction, and precision agriculture.

3.1 Dilution of Precision (DOP): Why Satellite Geometry is Critical for Accuracy Intermediate 3.2 What is Differential GNSS (DGNSS)? Correcting Errors with a Base Station Intermediate 3.3 RTK Explained: How Real-Time Kinematic Positioning Achieves Centimeter Accuracy Advanced 3.4 Understanding NTRIP: How to Get RTK Corrections Over the Internet Advanced 3.5 Precise Point Positioning (PPP): Global Accuracy Without a Base Station Advanced 3.6 PPP-RTK: The Best of Both Worlds Advanced 3.7 Virtual Reference Stations (VRS): How Network RTK Works Advanced 3.8 Real-Time vs. Post-Processing: Choosing the Right Workflow Intermediate

Advanced Methods and Integration

· 7 lessons Recommended: complete Topics 1-3 first

For users who need to work in remote areas, challenging environments, or need to understand the deeper mathematics of positioning.

4.1 PPK (Post-Processed Kinematic): The Alternative to RTK When You Don't Have a Signal Advanced 4.2 An Introduction to SBAS (WAAS, EGNOS, GAGAN): Free Augmentation for Critical Applications Intermediate 4.3 GNSS / INS Integration: What Happens When You Lose the Signal? Advanced 4.4 Understanding Geodesy and Datums: Why Your Coordinates Might Not Match the Map Advanced 4.5 Atmospheric Modeling: How We Correct for Troposphere and Ionosphere Prereq: 2.2 (Signal Structure) Advanced 4.6 Antenna Calibration: Why Your Antenna Matters Prereq: 1.6 (Receiver Selection) Advanced 4.7 GNSS Quality Control: How to Trust Your Data Advanced

Applications and Future Trends

· 8 lessons Recommended: complete Topics 1-2 first

See GNSS in action across different industries and learn what's coming next in satellite navigation technology.

5.1 GNSS in Surveying and Mapping: A Beginner's Guide to Professional Workflows Intermediate 5.2 Precision Agriculture: How Farmers Use GNSS for Tractors, Spraying, and Yield Monitoring Intermediate 5.3 Introduction to RTK Networks (CORS): How a Network of Base Stations Works Advanced 5.4 The Future of GNSS: New Signals, New Satellites, and Emerging Technologies Intermediate 5.5 GNSS in Aviation: How Planes Land in Zero Visibility Intermediate 5.6 Marine Navigation: GPS at Sea Intermediate 5.7 Autonomous Vehicles: The Role of GNSS in Self-Driving Cars Intermediate 5.8 GNSS for Timing: How the Internet and Power Grids Depend on Satellites Intermediate

GNSS for Specific Industries

· 6 lessons Recommended: complete Topics 1-3 first

From construction sites to 5G towers - how GNSS is deployed in demanding real-world environments across different industries.

6.1 GNSS in Construction: Machine Control and Site Surveying Intermediate 6.2 Mining and GNSS: Pit Optimization and Safety Intermediate 6.3 Rail and Transportation: Train Control and Asset Tracking Intermediate 6.4 GNSS in Telecommunications: Synchronizing 5G Networks Advanced 6.5 Surveying Deep Dive: Traverses, Control Networks, and Adjustments Prereq: 5.1 (Surveying Basics) Advanced 6.6 Environmental Monitoring: Tracking Glaciers, Volcanoes, and Tectonic Plates Intermediate

GNSS System Engineering

· 7 lessons Recommended: complete Topics 1-4 first

How real GNSS systems are built and deployed. From receiver architecture to antenna selection, communications, and field deployment.

7.1 GNSS Receiver Architecture: From Antenna to Position Intermediate 7.2 Antennas and Signal Reception: Why the Antenna Makes or Breaks Your System Intermediate 7.3 Multi-Frequency and Multi-Constellation Design: Getting the Most from Modern GNSS Prereq: 2.2 (Signal Structure) Advanced 7.4 GNSS Base and Rover Architecture: How Differential Systems Work Prereq: 3.2 (DGNSS) Intermediate 7.5 Communication: NTRIP, Radio, and Internet Correction Delivery Prereq: 3.4 (NTRIP) Intermediate 7.6 Power, Deployment, and Field Setup: Real-World GNSS in Practice Beginner 7.7 Common GNSS System Design Mistakes: What Goes Wrong and How to Avoid It Intermediate

GNSS Performance in the Real World

· 7 lessons Recommended: complete Topics 1-4 first

What actually happens outside the lab. Open sky vs urban environments, multipath, blockage, and how to interpret performance indicators.

8.1 GNSS in Open Sky vs Urban Environments: A Performance Comparison Beginner 8.2 Multipath and Reflection Effects: When Signals Take the Wrong Path Intermediate 8.3 Signal Blockage and Masking: How Obstructions Degrade Your Solution Beginner 8.4 GNSS in Dynamic Systems: Special Challenges for Robots and Vehicles Advanced 8.5 Environmental Effects on GNSS: Water, Glass, Metal, and Beyond Intermediate 8.6 GNSS Performance Indicators: Reading DOP, C/N0, and Satellite Count Intermediate 8.7 When GNSS Fails: Real-World Failure Cases and What to Learn from Them Intermediate

GNSS Engineering and Integrity

· 8 lessons Recommended: complete Topics 1-6 first

Advanced engineering topics: signal measurements, cycle slips, data formats, RTK ambiguity resolution, and system integrity for safety-critical applications.

9.1 Pseudorange, Carrier Phase, and Doppler: The Three GNSS Observables Prereq: 2.2 (Signal Structure) Advanced 9.2 Cycle Slips and Lock Time: The Silent Killers of High-Precision GNSS Advanced 9.3 RTCM and RINEX Explained: The Data Formats Behind Precision GNSS Advanced 9.4 Float vs Fixed RTK: Understanding Ambiguity Resolution Prereq: 3.3 (RTK) Advanced 9.5 GNSS Integrity and Protection Levels: Can You Trust Your Position? Prereq: 9.4 (Float/Fixed RTK) Advanced 9.6 RAIM and ARAIM: How GNSS Detects Its Own Failures Prereq: 9.5 (Integrity) Advanced 9.7 LOS/NLOS and Urban Degradation Detection: Identifying Bad Signals Advanced 9.8 Base Station Setup and Troubleshooting: Getting the Foundation Right Intermediate

GNSS Augmentation Systems

· 5 lessons Recommended: complete Topics 1-3 first

How SBAS, GBAS, PPP-RTK and Network RTK improve GNSS accuracy and integrity beyond what standalone receivers can achieve.

10.1 What Are GNSS Augmentation Systems? An Overview Intermediate 10.2 SBAS Explained: WAAS, EGNOS, MSAS and GAGAN Intermediate 10.3 GBAS: Ground-Based Augmentation for Precision Approaches Advanced 10.4 PPP-RTK and SSR Corrections: Global Precision Without a Base Station Advanced 10.5 Network RTK and VRS: How Reference Networks Deliver Better Accuracy Advanced

GNSS Security and Interference

· 4 lessons Recommended: complete Topics 1-4 first

GNSS signals are weak and unencrypted - making them vulnerable to jamming and spoofing. Learn what the threats are and how to defend against them.

11.1 GNSS Vulnerabilities: Why Satellite Signals Are Easy Targets Beginner 11.2 GNSS Jamming: How Interference Blinds Receivers Intermediate 11.3 GNSS Spoofing: Manipulating Position with Fake Signals Intermediate 11.4 Detection and Mitigation: Protecting GNSS Systems from Attack Advanced

GNSS Signal Processing

· 4 lessons Recommended: complete Topics 1-7 first

An advanced look inside the receiver: signal modulation, acquisition, tracking loops, and the filtering techniques that extract precision from noise.

12.1 GNSS Signal Structure and Modulation: Inside the Broadcast Advanced 12.2 Acquisition and Tracking: How Receivers Find and Follow Satellites Advanced 12.3 Tracking Loops: DLL, PLL and FLL Explained Advanced 12.4 Measurement Noise and Filtering: From Raw Signals to Precision Advanced

GNSS and Sensor Fusion

· 4 lessons Recommended: complete Topics 1-7 first

GNSS alone is not enough for autonomous systems. Discover how combining GNSS with IMU, cameras, and LiDAR creates robust, continuous positioning.

13.1 Why GNSS Alone Is Not Enough for Autonomous Systems Intermediate 13.2 GNSS + IMU: How Inertial Navigation Fills the Gaps Advanced 13.3 GNSS + Vision and LiDAR: Multi-Sensor Fusion for Autonomy Advanced 13.4 Fusion Architectures: Loose, Tight, and Deep Coupling Explained Advanced

GNSS Data and Analysis

· 4 lessons Recommended: complete Topics 1-9 first

From raw data logging to RINEX conversion, post-processing, and systematic quality assessment - the complete workflow for GNSS data engineering.

14.1 GNSS Data Logging: What to Record and How Intermediate 14.2 Data Conversion and Formats: RINEX, RTCM, NMEA and Beyond Advanced 14.3 GNSS Data Analysis: Visualising and Interpreting Position Quality Intermediate 14.4 Quality Assessment of GNSS Data: Residuals, Outliers and Completeness Advanced

GNSS Modernisation and Future Trends

· 4 lessons Recommended: complete Topics 1-9 first

New signals, LEO navigation satellites, dual-frequency smartphones, and AI - what the next generation of GNSS technology looks like.

15.1 GNSS Modernisation: New Signals and What They Mean for Accuracy Intermediate 15.2 LEO Satellites and the Future of Navigation Advanced 15.3 GNSS in Smartphones: Dual-Frequency and Raw Measurements Intermediate 15.4 AI and GNSS: Machine Learning Meets Satellite Navigation Advanced

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