Train-position locating device and train-position locating method

A train-position locating device comprising:

• an onboard control device incorporated in a train;
• a ground control device installed on a ground;
• and
• a train detection device installed on the ground and configured to detect the presence of trains on a plurality of tracks,
• the onboard control device being connected to the ground control device by wireless communication,
• the onboard control device being configured to:
• determine a track on which the train is present based on position information detected by a GPS receiver incorporated in the train and a result of a nearest track search,
• transmit identification information for identifying the own train and track information to the ground control device at the time of switching to a different track from among the plurality of tracks, and
• shift to an onboard-oriented train control mode upon receiving a response indicating “position is located” from the ground control device, and
• the ground control device being configured to:
• transmit a response indicating “tentative position is normal” to the onboard control device when another train is not present on the track decided as a tentative position received from the onboard control device, and
• transmit the response indicating “position is located” to the onboard control device when a change from the track to the different track from among the plurality of tracks received from the onboard control device is correct.