Test and Evaluation of GNSS-based Railway Train Positioning under Jamming Conditions

Satellite-based positioning has become a significant technical feature of next-generation railway train control systems. However, the Global Navigation Satellite System (GNSS) enabled train positioning is susceptible to the threat from radio frequency interference, which may lead to risks to the safe and efficient train operation. It is of great necessity to evaluate the influence of GNSS jamming in developing specific anti-attack solutions in the railway applications. In this paper, tests of GNSS jamming scenarios are carried out through a jamming injection platform, with which the different signals that can be utilized in jamming are investigated, including (non-)coherent continuous wave, amplitude modulation, frequency modulation and bandwidth limited noise. The trackmap database is involved to evaluate the precision level of localization under jamming-injected conditions. The result analysis in terms of the cross-track error illustrates the degradation of the receiver under the threats from interferences, although there are different levels and characteristics among the involved jamming signals.