Abstract

Air or satellite borne radar systems has shown millimeter accuracy in change detection by realizing the phase of the returned signal, which has put the radar system a useful piece of tool in structural monitoring and disaster prevention [1]. However the temporal availability of data is very limited due to long revisiting time. This problem could be solved by using a ground based radar system, which provide continuous monitoring of the area of interest. When operated in synthetic aperture mode, the data frequency is in order of minutes, while when operated in real aperture mode, the data frequency is a fraction of second, allowing not only long term displacement but also vibration mode analysis. The ground based synthetic aperture radar system by LiSALAB was used in this study to demonstrate monitoring of a railway bridge in real aperture and synthetic aperture mode.

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