Improving Integrated Navigation Systems in Railway Applications by Using Digital Map Information

Ulrich Schneider, Jens Speckels, Jan Troelsen

Abstract:	Knowledge of the train-position is essential for the or-ganisation and safeguarding of the transport management system in order for the railways to successfully function as a transport service . The position fixes of the respec-tive trains are basic parameters in any operation control system providing functions for a reliable operation and optimal traffic dispatching. This paper presents an innovative technology for railway applications to determine the fixed position in real-time within an accuracy of two meters along and across the track. The high accuracy is primarily realised through the ab-solute accuracy of GPS (Global Positioning System) and the differential correction data provided by telemetry. Additional sensor information facilitates a continuous determination of position and thus increases the reliabil-ity of the system but does not improve the position accu-racy as long as DGPS is available. The advantages of the rather complex system architecture are evident under unfavourable conditions. During peri-ods of GPS dropouts complementary sensors maintain the systems accuracy. A sophisticated system concept guar-antees high accuracy, reliability and integrity.
Published in:	Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999) June 27 - 30, 1999 Royal Sonesta Hotel Cambridge, MA
Pages:	525 - 532
Cite this article:	Schneider, Ulrich, Speckels, Jens, Troelsen, Jan, "Improving Integrated Navigation Systems in Railway Applications by Using Digital Map Information," Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999), Cambridge, MA, June 1999, pp. 525-532.
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