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http://dx.doi.org/10.7843/kgs.2022.38.11.43

A Study on the D-InSAR Method for Micro-deformation Monitoring in Railway Facilities  

Kim, Byung-Kyu (Advanced Railroad Civil Engrg. Division, Korea Railroad Research Institute)
Lee, Changgil (Advanced Railroad Civil Engrg. Division, Korea Railroad Research Institute)
Kim, Winter (Advanced Railroad Civil Engrg. Division, Korea Railroad Research Institute)
Yoo, Mintaek (Advanced Railroad Civil Engrg. Division, Korea Railroad Research Institute)
Lee, Ilhwa (Advanced Railroad Civil Engrg. Division, Korea Railroad Research Institute)
Publication Information
Journal of the Korean Geotechnical Society / v.38, no.11, 2022 , pp. 43-54 More about this Journal
Abstract
The settlement at the railroad foundation is often the leading cause of track irregularity and potential derailment. The control of such deformation is considered necessary in track maintenance practice. Nevertheless, the monitoring process performed by in situ surveying requires an excessive amount of manpower and cost. The InSAR, a remote sensing technique by RADAR satellite, is used to overcome such a burden. The PS-InSAR technique is preferred for a long-term precise monitoring method. However, this study aims to obtain relatively brief analysis results from only two satellite images using the D-InSAR technique, while a minimum of 25 images are required for PS-InSAR. This study verifies the precision of D-InSAR within a few millimeters by inspecting railroad facilities and land settlements in Korea Railroad Research Institute's test track with images from TerraSAR-X Satellite. Multiple corner reflectors were adopted and installed on an embankment and the building roof to raise the surface reflectivity. Those reflectors were slightly adjusted periodically to verify the detecting performance. The results revealed the optimum distance between corner reflectors. Further, the deformation of railway tracks, slopes, and concrete structures was analyzed successively. In conclusion, this study indicates that the D-InSAR technique effectively monitors the short-term deformation of a broad area such as railway structures.
Keywords
Corner reflector; D-InSAR; InSAR; Railway; Remote sensing;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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