Fast and accurate measurement of radiated emission of moving trains according to IEC 62236

This work deals with the experimental characterization of the spectrum of electromagnetic radiated emissions (RE) of moving trains. In particular, a fully-automated measurement system and an optimized measurement procedure are designed and implemented, conforming to requirements of the current International Standards IEC 62236-2 and EN 50121-2. The proposed system represents an optimization of a previous version, obtained by resorting to a unique hybrid biconical/log-periodic antenna instead of the two separate antennas (biconical and log-periodic), as suggested in the aforementioned Standards. As a result, the measurement system is simpler, cheaper, it allows minimization of the number of required train runs (i.e. testing time and thus costs) and, as a whole, it leads to improved performance of the measurement process. Full compliance of the proposed measurement procedure and system with IEC 62236 and CISPR 16 in terms of measurement uncertainty is discussed. As a specific example, test results obtained with measurements carried out along the high-speed railway line interconnecting Milan to Bologna, Italy, are reported.