Evaluation of Noise Immunity of Channels with Rail and Inductive-Rail Lines

Modern train interval control systems contain communication channels between traffic organizers and the train locomotive, using rail and inductive rail as communication lines. The rail threads that make up these lines are an integral part of the traction network and, therefore, the traction current is channeled through them. Bearing this in mind, the signals of these channels operate under the conditions of strong interference from traction current. At present, continuous automatic locomotive signalling systems continue to improve, so it is necessary to have information on the relationship between the immunity of their channels, in particular under conditions of traction current interference, from different signal parameters, such as carrier frequency. This article deals with the method of evaluating the influence of the frequency of the carrier signal on the noise resistance of the channels comprising rail and inductive rail lines.