Effect of GNSS Waveform Distortions on SNR

Effect of satellite signal anomalies on SNR(Signal to Noise Ratio) of GNSS(Global Navigation Satellite System) receiver is studied.According to the 2OS(Second-Order Step) threat model of satellite signal anomalies,i.e.TMA(Threat Model A),TMB(Threat Model B) and TMC(Threat Model C),the correlation peak characteristics are analyzed,then the SNR difference of nominal signals and 2OS model signals are derived,finally numerical analysis is made in the 2OS model parameter space.The results show that TMA makes SNR loss,but TMB and TMC make SNR increase in certain instances,so SNR cannot be a mean of signal quality monitoring for satellite signal anomalies.