Position-Detecting System Based on the Global Positioning System: Potential Use in Improving Car Body Tilt Control


Kimiaki Sasaki

Document Type

Journal Article

Publication Date


Subject Area

infrastructure - track, mode - rail, mode - car


Trains, Train detectors, Tilting trains, Tilt control, Site selection, Railroad trains, Placement (Location), Operational tests, Narrow gage track, Location, Locating, Japan, GPS, Global Positioning System, Demonstration projects, Curved track, Automatic train location, Algorithms, Accuracy


The Railway Technical Research Institute has developed a position detection system based on a new Global Positioning System (GPS). This system uses GPS to detect the approximate location of a train and then selects one of three algorithms to process the location data and determine the train’s precise location. Running tests performed on the system showed that its position error was less than 4 m. This system has the potential to be used to control the car body tilting of tilt trains accurately and allow them to run at the maximum possible speed through the tight curves typical of the narrow-gage lines found in Japan. In addition, the automatic map created by this system makes it much easier to maintain the accuracy of the on-board database.