Strategy for Vertical Deformation of Railway Bridge Monitoring using Polarimetric Ground-based Real Aperture Radar System

Zou, Lilong ORCID:, Nico, Giovanni, Alani, Amir Morteza and Sato, Motoyuki (2024) Strategy for Vertical Deformation of Railway Bridge Monitoring using Polarimetric Ground-based Real Aperture Radar System. Structural Health Monitoring. ISSN 1475-9217

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The health monitoring of infrastructure is vital for ensuring the safety and structural integrity of bridges. Recently, ground-based real aperture radar (GB-RAR) systems have been successfully utilized in the dynamic and static monitoring of bridges. In this study, a comprehensive and innovative approach is presented to monitor the vertical deformation of a long-span metallic railway bridge and a reinforced concrete Shinkansen bridge in Japan using a polarimetric GB-RAR system. Distinct from conventional signal processing procedures, the proposed method omits the coherent scatterer selection step. Instead, polarization analysis is employed to evaluate the properties of scatterers and identify those corresponding to bridge sections requiring monitoring, while considering the structural characteristics of the bridge. Simultaneously, the signal-to-noise ratio for monitoring is enhanced by combining co-polarization responses from scatterers.
Furthermore, the radar look angle is determined by accounting for the spatial configuration of the survey and
the polarization orientation angle. Lastly, vertical deformation is assessed by projecting line of sight deformation in the vertical direction. The findings reveal the dynamic responses of the two bridges under diverse loading conditions, which include the transit of a low-speed train and a high-speed Shinkansen bullet train. The results demonstrate that the polarimetric GB-RAR interferometry technique, coupled with the developed algorithms, can be effectively applied to monitor any type of bridge with unparalleled spatial and temporal resolutions.

Item Type: Article
Identifier: 10.1177/14759217231226128
Keywords: Bridge monitoring, Ground-based Real Aperture Radar (GB-RAR), Interferometry, radar polarimetry, Shinkansen bridge, vertical deformation
Subjects: Construction and engineering
Depositing User: Lilong Zou
Date Deposited: 17 Apr 2024 09:04
Last Modified: 06 Jun 2024 08:45


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