Patent ID: 11938983
Assignee: HITACHI, LTD.
Field: Measurement (Instruments)
Classification: CPC B  G | IPC B  G

Claim 0:
1. A train position estimation device comprising:
a surroundings shape measurement unit installed to a vehicle traveling on a path and configured to measure a surroundings shape at a current position of the vehicle and output data of the measured surroundings shape as measured surroundings shape data; and
a map storage unit configured to store control surroundings shape data that is data of a surroundings shape at each position measured in advance,
wherein the measured surroundings shape data is compared to the control surroundings shape data to calculate a position of the vehicle,
the train position estimation device comprising:
a start position estimation unit configured to store a presence probability at each position where the vehicle may be present;
a map retrieval section determination device configured to output the control surroundings shape data at the position in descending order of the presence probability; and
a matching processing device configured to compare the measured surroundings shape data to the control surroundings shape data outputted from the map retrieval section determination device to output a position at which the difference is a predetermined threshold or less,
wherein the start position estimation unit is configured to store a probability of position loss at a position where positional information is lost in a past to acquire the presence probability based on the probability of position loss.