A Real Data Based Carrier-to-Noise Density Ratio Evaluation of GNSS Signal in Interference Environment

The radio frequency interference has become a rising problem to the signal of Global Navigation Satellite System (GNSS). Many researchers have analyzed the impact of interferences, and the effective Carrier-to-Noise density ratio (C/N0) of receivers after post-correlation has been deduced in theory. However, few outdoor tests have been done to verify the theory of jamming impact because it is illegal to broadcast high-power interference in open area. In this paper, an outdoor experiment as well as the data analysis is presented to compare the performances of GNSS signals under jamming with their theoretical performances, including the signals of Global Position System and BeiDou system. The real data result shows that the software defined receiver can maintain its tracking loop under the Jamming-to-Signal power ratio up to 45dB in the test condition, and the descending trend of real data C/N0 matches the theoretical curve of effective C/N0.