Why GNSS Is Not Getting Fixed Solution? Common RTK Problems Explained
Many surveyors face one common issue during RTK survey:
the GNSS receiver remains in FLOAT mode and does not achieve FIXED solution.
This article explains the most common reasons behind GNSS fixed solution problems and their practical solutions.
1. Poor Sky Visibility
Satellite visibility is one of the most important factors in GNSS surveys.
High-rise buildings, trees, and bridges block satellite signals.
Solution
• Move to open sky area
• Avoid working close to tall structures
• Check satellite count before starting survey
2. Internet Correction Issues
RTK surveys require stable internet correction from NTRIP or base stations.
Weak internet causes:
• float solution,
• signal interruption,
• poor accuracy.
Solution
• Check SIM card data
• Restart internet connection
• Reconnect correction source
3. Multipath Error
Multipath happens when satellite signals reflect from buildings or metal surfaces.
This creates incorrect observations.
Solution
Avoid:
• glass buildings,
• metal structures,
• reflective surfaces.
4. Long Distance from Base Station
Large distance between rover and base station reduces accuracy.
Solution
Use nearest available correction network whenever possible.
5. Low Satellite Count
Insufficient satellites prevent fixed solution.
Solution
Wait for better satellite visibility before observation.
Final Thoughts
Before changing GNSS settings, always first check:
• sky visibility,
• internet connection,
• satellite count,
• and correction source.
Most RTK fixed solution problems are solved by these basic checks.
