Interferometric Synthetic Aperture Radar For Track Condition Monitoring. Case Study on Malmbanan
Abstract: There is over 15,000 km of track in the Swedish railroad network. This network is vital for the transport of people and goods across the country. It is important that this network is monitored and maintained to ensure good function and safety. In recent decades the development of Interferometric Synthetic Aperture Radar (InSAR) and Time Series techniques has allowed researchers, geotechnicians and engineers to measure ground deformation over a large area remotely with high frequency and accuracy. The purpose of this study is to evaluate the use of InSAR technique for track condition monitoring and compare it to a conventional track condition monitoring techniques. The northern Malmbanan which is used to transport iron ore from Kiruna mines to ports Narvik in Norway was used as a case study for this project. Coordinate matching of measurements from the provided Small Baseline Subset (SBAS) InSAR data and Optram data from survey trains was performed. Then measured changes over different time spans in the two systems were overlapped and classified with different thresholds to see if there is correlation between the two systems. The results from the classification showed that there was too much variation in correlation to draw a clear conclusion about the use of InSAR for track condition monitoring. The SAR data which was captured with the Sentinel 1A/B constellation lacks the resolution or coherence to be practically useful for track condition monitoring.
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