电离层闪烁对GPS接收机跟踪环路的影响

电离层闪烁是影响卫星导航系统定位性能的重要因素之一。该文介绍了在电离层闪烁的研究中，表征幅度闪烁强度的S4指数。建立电离层闪烁对信号载噪比的影响模型，得到了不同强度的幅度闪烁导致GPS接收机跟踪环路失锁的概率情况。最后分析出，随着载噪比的降低和电离层闪烁强度的增大，接收机跟踪环路的失锁概率也就越大。

Influence of Ionospheric Scintillation on GPS Tracking Loop

The ionospheric scintillation which affects the positioning performance of the satellite navigation system is important factor. The paper introduces the S4 index which can give the strength of the amplitude fading. The paper establishes the model of the fluctuation of the c/no by the relationship between Ionospheric scintillation and the c/no. It gets the probability of the GPS receiver tracking loops losing lock in the influence of Ionospheric scintillation. Analysis results show that with the lower c/no and ionospheric scintillation intensity increase the probability of the receiver tracking loops losing lock is greater.