Research on the Index System of BDS-3 Signal Quality Evaluating Methods Based on High-Gain Observations

More and more researches have focused on many aspects of Signal Quality Monitoring (SQM) algorithms which have advanced significantly over these years. However, traditional methods could disclose only the partial aspects of signal quality, little has been done on the comprehensive analysis of different parameters that could together reflect the whole characteristics of signal quality. In this paper, we provided a new method for synthetic power spectrum deviation evaluating, and the analysis parameters related to signal power, waveform, frequency spectrum and correlation curve were further improved based on the traditional methods. The evaluating methods of repairing capability, which is unique for BDS-3, and signal polarization mode were proposed and suggested to be added to SQM algorithms. Based on this, we presented a comprehensive analysis of SQM algorithms. Finally, based on the latest data collected by the 40-m large-aperture antenna at the Haoping Radio Observation from May to September of 2020, the initial signal quality analysis of the new-generation BDS-3 navigation signals for all the thirty in-orbit satellites were given. Results showed that compared with the traditional signal quality assessment system, the satellite signal quality assessment system presented in this paper can fully reflect the merits and disadvantages of satellite navigation signals. Research results can further complement the existing signal quality evaluation system, and provide guide reference for BDS and other GNSS satellite in signal performance testing at various stages.