卫星导航信号异常对信噪比的影响

研究了卫星导航信号异常对导航接收机信噪比的影响。根据卫星导航异常信号3个2OS(Second-Order Step)模型,即TMA(ThreatModelA)、TMB(Threat Model B)和TMC(Threat Model C),分析了其相关峰特性,然后推导得到了3个模型下异常导航信号信噪比与正常信号信噪比之差,并在模型参数取值范围内进行了数值分析。结果表明,TMA模型信号异常会造成信噪比损失,而TMB和TMC模型信号异常在某些情况下则对信噪比有增强作用,因此信噪比不能作为2OS模型卫星导航信号异常的监测手段。

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.