Generally, tachometer generators are used to calculate the train running distance under on-board units, and transponders are used to detect the train position. However, with this approach the effects of wheel skidding or slipping need to be compensated, which would require a large number of transponders. Therefore, a method is under development using both a tachometer generator and inertial sensors, to calculate train running distances independently of the number of wheel rotations and train position detection, using curved line sections. The results of simulation analyses using managed time-stamped data show that it is possible to compensate train running distance using this method, even when wheel skidding or slipping occurs, and that it is possible to detect train position.
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