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Analyzing the Effect of Interference in GNSS Scintillation
Monitoring
Rodrigo RomeroPolitecnico di [email protected]
11th European Space Weather Week. Liege, BELGIUM. November 17-21 2014
Interference in GNSS receivers The reception of GNSS signals can be affected by Radio Frequency
Interference (RFI). The presence of unintentional interference is recognized to be one of the
growing threats to GNSS performance.
Potential Interference sources in GPS and Galileo bands
V
Interference Signal
ADCBPFLNA
Front-End
ACQUISITION TRACKING
Receiver Processing Outputs
• E,L,P correlations.
• Integrated Doppler.
• C/N0 estimation.
GNSS Satellites
Ionosphere irregularities
GNSS Antenna
Interference Scenario
Interference EffectsHow much the ionospheric scintillation indices are affected, if at all, may depend on several characteristics like the type of interference signal, its power and/or bandwidth.
What if the interference is mitigated?
What if the RFI is detected and triggers a mitigation technique?
0 1 2 3 4 5 6 7 8 9-240
-230
-220
-210
-200
-190
-180
-170
-160
Frequency [MHz]
Pow
er S
pect
ral D
ensi
ty [
dB/H
z]
Power Spectral Density comparison
Before wavelet based excisionAfter wavelet based excision
Mitigation techniques may also suppress useful signal while trying to eliminate the interference. New distortions in the scintillation indices may appear!!
Join us in the poster session
Thanks!