Wavelet Analysis of Received Port Signal of Centre-fed Boundless Track Circuits

Abstract

In order to solve the problem that the unbalanced traction current submerge the detection signal of centre-fed boundless track circuits, according to the character of wavelet, which can detach the signals with different frequency, the current signals of received port in the broken rail modes and normal modes were analyzed by the db10 wavelet function when traction current overlay sending port of track circuit .the result presents that: the d3 detail signal band which was obtained by decomposed current signal of received port with db10 wavelet include the detection signal, so the d3 detail signal can be regard as detection signal .By comparing d3 detail signal amplitude of the normal model with the broken model, whether the rail had broken can be determined. A new analysis method is provided to make sure broken detection accuracy of track circuit.