Train Velocity Measurement and Positioning System Based on Spatial Filter

For train velocity measurement and positioning system in train control system, Doppler radar or accelerometer is usually utilized to detect the slip/slide. However, the complicated environmental conditions or the uneven rail brings the big measurement error and the poor reliability. In this paper, the train velocity measurement and positioning system based on spatial filter has been described with the advantage of simple structure, high measurement precision, high robustness, and the non-contacted measuring method. In the train velocity measurement and positioning system architecture, the wheel speed sensor and spatial filter speed sensor are integrated to detect the train speed, and the beacon system is utilized to localize the position of the train. The fault diagnosis and fusion algorithm is depicted in detailed. According to the field test results, the slip/slide can be detected accurately and reliably, and the train speed compensation can be implemented by fusing the spatial filter sensor.