Author(s)

Th. Luck, E. Lohnert, B. Eissfeller & P. Meinke

Abstract

Track irregularity measurement using an INS- GPS integration technique Th. Liick\ E. Lohneif, B. Eissfeller^ & P. Memke^ ^Institute of Geodesy and Navigation, University FAF Munich, Neubiberg, Germany. Abstract The knowledge of geometric track irregularities which are dangerous to dy- namic safety (DYSAF) of railways becomes evident with rising use of tilt- ing trains like the German ICES or ICT, as irregularities may lead to train derailment. To identify track defects, a new measuring technique using dif- ferential GPS and an inertial navigation system to determine the position of the track measuring system is presented. The paper discusses the system design and integration technique and presents experimental results from the laboratory test vehicle. Also critical aspects of high-precision DGPS/INS integration are outlined. 1 Introduction The goal is to measure long wavelength track irregularity with up to 150 m wavelength within mm accuracy. The length of the test track section

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