Author(s)

U. Schneider & J. Troelsen

Abstract

Introducing digital map information into train positioning systems: chances and risks U. Schneider & J. Troelsen Institute of Flight Guidance and Control, Technical University of Braunschweig, Germany. Abstract The use of digital map in a Global Positioning System (GPS) supported navigation systems has been investigated. For the position of a train to be useful, not only the earth referenced geometric position (geometric position), but also the railway reference referred position (topologic position) must be known. The use of a digital map enables the mapping between these two reference systems. This mapping makes integrity monitoring of the train location possible, since the navigation systems position solution can easily be compared with the railway commanded position in the topologic reference system. The most significant factor, dictating the absolute accuracy of the traditional technical navigation system position solutions, is the accuracy of GPS and the dif

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