Reliability enhancing mechanism for train positioning based on cyclic check cross coding inductive loop wire for medium-low speed maglev

As a form of urban rail transit, medium-low speed maglev transportation system also requires safety-critical design in its operation and control system (OCS), for the OCS system relates to not only operation efficiency, but system reliability and safety as well. The train positioning system, which is the most important component in OCS, counts the real-time train position and helps OCS to give the correct, safe train dispatching order. Cross coding inductive loop wire has been recognized as one of the most suitable technique in solving the positioning problem of train which has no contact with the track, however, reports on the train positioning system based on cross coding inductive loop wire for medium-low speed maglev are still rare to be seen, especially reports on enhancing the positioning reliability. In this paper, a reliability enhancing mechanism for train positioning based on cyclic check cross coding inductive loop wire for medium-low speed maglev has been proposed, by adding check inductive loop bits according to cyclic check principle onto the original address code sequence in each minimum positioning section, the reliability of acquiring the correct original address code for the positioning system can be enhanced. Simulation has been done to verify such enhancement, and the comparison of positioning performance between parity check and cyclic check cross coding inductive loop wire has also been done in this paper.