In this paper, the result of the analysis on the impact of unintentional GNSS jamming on national infra-facilities is presented. In particular, actual test results on GNSS jamming at K-city, a driving test site for autonomous-vehicle, in Hwasung city, S. Korea are presented. Frequency spectrum analysis is performed on the received GNSS L-band signals to determine the presence of the jamming signal and, in parallel, a 2-D correlation was performed to identify the jamming signal type. The degradation of positioning performance by jamming in major facilities is assessed by comparing J/S ratio and GNSS-RTK positioning results for the same measured received signal. As a result of the analysis on the actual data, the jamming signal in the L2 band was detected and its type was identified in the form of intermittent Chirp and CWI.

Keywords: jamming, GNSS, autonomous-vehicle