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- Signal quality monitoring aspects in GNSS signals affected by evil waveformsPublication . Sousa, Fernando; Nunes, Fernando; Negrinho, António; Fernandes, Pedro; Boto, PedroEvil waveforms (EWF) are anomalies in the GNSS transmitted signals that can degrade significantly the accuracy of the PVT solution. The cross-correlation function of the incoming signal disturbed by EWF distortion and the locally-generated code signal is obtained analytically for threat models TM-A, TM-B and TM-C. These results are useful to evaluate efficiently the performance of EWF detectors, namely the detectability and hazard regions.