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Analyzing the Effect of Interference in GNSS Scintillation Monitoring Rodrigo Romero Politecnico di...

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Analyzing the Effect of Interference in GNSS Scintillation Monitoring Rodrigo Romero Politecnico di Torino [email protected] 11th European Space Weather Week. Liege, BELGIUM. November 17-21 2014
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Page 1: Analyzing the Effect of Interference in GNSS Scintillation Monitoring Rodrigo Romero Politecnico di Torino rodrigo.romero@polito.it 11th European Space.

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

Page 2: Analyzing the Effect of Interference in GNSS Scintillation Monitoring Rodrigo Romero Politecnico di Torino rodrigo.romero@polito.it 11th European Space.

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

Page 3: Analyzing the Effect of Interference in GNSS Scintillation Monitoring Rodrigo Romero Politecnico di Torino rodrigo.romero@polito.it 11th European Space.

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

Page 4: Analyzing the Effect of Interference in GNSS Scintillation Monitoring Rodrigo Romero Politecnico di Torino rodrigo.romero@polito.it 11th European Space.

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.

Page 5: Analyzing the Effect of Interference in GNSS Scintillation Monitoring Rodrigo Romero Politecnico di Torino rodrigo.romero@polito.it 11th European Space.

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!!

Page 6: Analyzing the Effect of Interference in GNSS Scintillation Monitoring Rodrigo Romero Politecnico di Torino rodrigo.romero@polito.it 11th European Space.

Join us in the poster session

Thanks!


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