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When the GNSS signal is overshadowed by the wide-range radio noise incited by a solar burst event, a potential interference would happen. Theoretical analysis shows the solar radio burst could impact GNSS signal in the way of a directional interference. A new parameter, Solar Radio Burst Index (SRBI), is put forward to indicate the severity of impact on signals. The SRBI is defined on the variation of carrier-to-noise ratio (C/N0) of GNSS signal under solar burst impacts with respect to the quiet period of solar activity. Based on SRBI, a model on signal fading caused by the interference is developed further. The model is tested with GNSS observation from significant solar burst events from 2001 to 2017. The result shows an accuracy of 80% has been achieved. The SRBI and signal fading model could be used to monitor the solar burst with GNSS signal itself.