Low cost obstacle detection for smart railway infrastructures

In this work an intelligent infrastructure is shown, which allows to detect obstacles in railways, based on optical emitters. The sensorial system is based on a barrier of emitters and another of receivers, placed each one of them at one side of the railway. Apart from the disposition of the sensorial system, is also presented a codification method of the emission in order to detect the reception or the non-reception of transmissions between an emitter and a receiver. The presented method is based on a signal codification using complementary sequence pairs, suitably adapted for their simultaneous emission through the transmission channel. A high reliability under adverse conditions is achieved with the developed system, being possible to detect the presence of obstacles, and to inform about their situation.