Correlation receiver of a numerical code signal of automatic locomotive signaling with a useful signal restoration function

Abstract

Rail transport is the most important kind for sustainable growth of the economy of the Russian Federation as a whole and the Eastern Siberian region in particular. At the same time, the efficiency of rail transport is most often characterized by the speed of passengers and cargo delivery. Increasing the speed of trains, in turn, imposes increased requirements on the systems that ensure the safety of train traffic, one of which is automatic locomotive signaling. This system is subject to intense interference that occurs due to the complex electromagnetic environment at railway transport facilities. Existing means of protecting locomotive safety devices do not meet the requirements for devices of this kind and require technical re-equipment. This work is aimed at modeling and evaluating the receiving device of automatic locomotive signaling with the function of restoring the useful signal, which is intended for the modernization of receiving devices of automatic locomotive signaling. The operating principle of the proposed device is to calculate the mutual correlation function between the signal/noise mixture coming from the receiving locomotive coils and the ideal signal of the numerical code. In the future, the device automatically determines the numerical code arriving at its input based on the VKF level. Using simulation modeling, the threshold signal/noise ratio was estimated for all code messages under the action of stationary harmonic and random pulse interference. In all cases, the value of this ratio is within acceptable limits and is several dozen times higher than the value of this ratio in the existing FL-25/75M filter, which indicates the operability of the developed device. Semi-natural measurements were carried out to verify the restoration of the numerical code under the influence of intense electromagnetic interference when the locomotive was moving along double-track electrified sections of the East Siberian Railway.