Control of railway level crossings, uses radio detectors at each end of monitoring zone on either side of crossing to compare radio signal reflected from train with threshold value to initiate operation of level crossing control devices

摘要

The level crossing control detects (1,6,9) the presence of the train (5) using a modulated radio signal directed along the railway line. A detector is placed at each end of the monitored zone and at the level crossing. The wave reflected by the train is detected and compared to a threshold value to detect the presence of the train in the monitored zone and operate (17) barriers and/or signals.