Interference Monitoring in the Central European GPS Geodynamic Reference Network
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Interference Monitoring in the Central European GPS Geodynamic Reference
Network István Fejes
FÖMI Satellite geodetic Observatory
Penc, Hungary
ESF Workshop on “Active Protection of Passive Radio Services: towards a concerted strategy”. 28-29 October 2004, Cagliary, Italy
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The use of GNSS for Earth sciences • Presently the most important tool for monitoring tectonic
processes beside VLBI and SLR• Applied in Earth rotation and reference frame studies• Atmospheric sciences
– water vapor content determination– ionosphere studies
• All these are based on the operation of high precision GPS networks.– High precision networks need high quality data
• RFI harmful to GNSS signals – reduces S/N– leads to rough positioning errors– causes data loss– inhibits measurements
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The Central Europe GPS Geodynamic Reference Network (2003)
Epoch sites
Permanent sites
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The interference monitoring programme
• Monitor CEGRN sites regularly
• Collect and document user feed back
• Report interference to frequency management authorities
• Warn users
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The monitoring rules
• Equipment: Advantest spectrum analyser
• Frequency bands:
– Broad band – 1-2 GHz
– GPS L1 – 1575.42MHz +/- 15 MHz
– GPS L2 – 1227.6 MHz +/- 15 MHz
– Galileo E5A-E5B, GPS L5 - 1164-1215 MHz
– Galileo E4, E6 – 1250-1300 MHz
– Galileo E2, L1, E1- 1550-1600 MHz
– Optionally high resolution tracks
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Checking Piszkéstető
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GNSS RFI Monitoring Directory Structure
RFI-MONITORING
SUMMARY Location -> mon. time sequence
CATALOGUE Location and monitoring details Data file IDs
DATA-FILES ID, Spectrum images
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Example data files
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Conclusion
• GNSS RFI mapping – Tool for site selection
– Assists site quality monitoring
– Assists GPS data reduction and analysis
– Warns GPS users of „hot spots”
– Alerts authorities
– Mitigate harmful consequences