This paper outlines recent advances in the acquisition, processing and interpretation of GPR data in relation to a high-speed train-mounted multiple-antenna GPR system for non-destructive assessment of the railway trackbed. A novel way of collecting data of good integrity at line speeds of 60 miles per hour and above has been presented. Automatic processing tools are developed to extract ballast layer thickness, reduce the effect of non-steel sleepers in the data and identify surface objects along the line (e.g. AWS Magnets, isolated pieces of rail on the track, footbridges etc). Results are presented of a high-speed performance trial (HSGPR Trial) to collect approximately 320 miles of radar data carried out on the UK railway system, with detailed slow-speed follow-up tests and Automatic Ballast Sampling (ABS) for accurate depth assessment and ballast quality characterization. The results indicate that the feasibility of obtaining accurate interpretation results from high-speed rail surveys using advanced GPR in near real-time.
GPR for high-speed rail trackbed investigations
Bodenradar für Untersuchungen von Hochgeschwindigkeits-Gleisbetten
2006
7 Seiten, 13 Bilder, 11 Quellen
Conference paper
Storage medium
English
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