Research on GNSS Signal Abnormal Monitoring Technology

Abstract

With the continuous development and popularization of positioning and navigation system related applications, it is becoming more and more important to improve the security and reliability of global satellite navigation system. Due to the complex space electromagnetic environment and the failure of satellite hardware in the transmission process, the satellite signal may be abnormal, thus affecting the normal use of GNSS services by users. This makes the research of GNSS signal anomaly detection and recognition technology significant. The anomaly of satellite signal is mainly reflected in the anomaly of parameters and positioning results in the process of signal processing of the receiver. Therefore, according to the output parameters of the receiver in the acquisition, tracking, message resolution and other stages, the integrity of satellite signal can be detected, and the possible signal anomaly can be identified. This paper mainly introduces the monitoring methods and analysis methods of GNSS signal anomaly monitoring technology, and comprehensively evaluates the signal quality of the receiver from five categories of indicators: time domain index, frequency domain index, modulation domain index, correlation domain index and measurement domain index, respectively. The acquisition methods of each signal quality index and its indication are also discussed. The relationship between the standard and the performance of navigation signal is introduced.