At Which Station Am I?: Identifying Subway Stations Using Only a Pressure Sensor

This paper presents the first study to identify a current station in a large subway network using only a pressure sensor. The air pressure in a train is changed by geographical and structural factors such as the difference in elevation and air flow caused by vents etc. This gives us a good clue in locating our present position especially in underground tunnels. We applied this method to the actual data of the air pressure measured in the Tokyo Metro including 9 lines with 192 stations, and achieved 85 % accuracy to infer at which station we are.