Use of Coded Signals to Wheel Train Detection

PATRICIO DONATO; JESÚS UREÑA; JUAN JESÚS GARCÍA; MANUEL MAZO; ÁLVARO HERNÁNDEZ

Lisboa (Portugal)

Conferencia; 9th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA 2003); 2003

Universidade Nova de Lisboa

The detection of the passage of railway units by certain points of the railway line (mainly in the junctions or bifurcations of the routes), of reliable way, is a functionality of great importance for the safe management of the circulation. Most of the existing systems to that end bases its operation on the detection of the disturbance that undergoes a magnetic flux (generated by means of coils) to the passage of the wheel of the train. With the system proposed here, we make this detection with the coils located next to the rail of the route, but without additional electronics located in this place. All the electronic systems are concentrated in a point that can be to a considerable distance from the rail. This make easier the tasks of maintenance of the equipment, in addition to protecting it of the noises and aggressions of the environment. In order to compensate the attenuation of signal in the wires and the external noise, we propose a codification of the signal sent to the emitting coil by means of pairs of Golay complementary sequences.