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Evil Waveforms (EWF) threaten the integrity of GNSSs. Experienced once on GPS signals, such threats could also affect new GNSS signals, such as Galileo ones. NAVYS is a highly flexible GNSS constellation simulator capable of generating any existing navigation signal modulation. Moreover, it has been recently upgraded to be able to distort signals with ICAO EWF models, whatever the simulated constellation and/or modulation. The present paper hence demonstrates the effects of EWFs on Galileo signals, and compares it to the effects of the same anomalies on GPS signals. The distorted signals generated by NAVYS are first observed using classical signal measurement devices such as oscilloscopes and spectrum analyzers, and then with TAS own GNSS Environment Monitoring Station, GEMS.

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