Infrastructure Non-Linear Deformation Monitoring Via Satellite Radar Interferometry

The advantages of satellite radar interferometry for displacement monitoring are demonstrated in the cases of monitoring man-made structures, i.e., buildings, bridges and dams. The application of PSInSAR methodology using ENVISAT radar images in urban area of Bratislava (Slovakia) allowed for detecting the changes over areas, that were out of interest of any regarding conventional monitoring technique. The PS derived results over structures with an existing geodetic measurements (levelling, GNSS) are compared. In other case, ascending vs. descending combination is examined. The comparison with GNSS and levelling data indicates good correlation and confirms achievable precision of InSAR measurements. As a whole, the investigated urban area of Bratislava is stable with the linear displacement trends within a ±3 millimetres per year. However, the non-linear approach reveals small movements on the structures without the prior interest of particular monitoring technique. Thanks to technology driven progress in the development of high resolution SAR sensors (e.g. TerraSAR-X) many permanent scatterers can be found in one individual man-made construction. Moreover, with the shorter revisit times it is possible to process a long series of SAR data and expand standard PS model to account for a seasonal expansion due to changes in temperature, water levels, pressure, etc. The topic of separation between deformations and seasonal movements is discussed within the exploitation of TerraSAR-X data for deformation monitoring of Plover Cove Dam and high-rise building of Hyatt Hotel, both located in Hong Kong. Data have been processed using advanced multi-temporal processing techniques implemented in SARPROZ. These techniques show high potential for continuous monitoring of ground motion and structure stability in civil surveillance. * Corresponding author. Tel.: +421-917-669-453; fax: +421-2-5292-5476. E-mail address: [email protected] 2 Author name / Procedia Technology 00 (2014) 000–000 © 2014 The Authors. Published by Elsevier Ltd. Peer-review under responsibility of the Organizing Committees of CENTERIS/ProjMAN/HCIST 2014