On Impulsive Noise from Shinkansen

Measurements of impulsive noise radiating from individual bullet trains on the New Tokaido Line (called Shinkansen in Japanese) have been performed with the APD-CRD measuring apparatus using dipole antennas of vertical and horizontal types. Both an APD and a CRD have been simultaneously measured in a narrowband and at two frequencies of 50 and 100 MHz for noise samples taken in time succession for individual bullet trains. Based on the analysis of these measured APD's and CRD's, the following remarkable results have been obtained: APD's and CRD's, together with the parameters derived from individual APD's, average, rms, antilog of noise amplitudes, and the statistical parameter V0.1, can be grouped into three different environments of train speed and acceleration or deceleration. on. A model for the impulsive noise is presented, saying that any elementary section of overhead electric wire radiates impulses with amplitudes varying randomly during the time interval when it makes contact with pantographs on the top of vehicles. Good fits are shown between time variations of values of the statistical parameter V0.1 obtained as individual trains pass in front of the measuring site, and those of a certain related electric field calculated based on this model.