Dynamic displacement monitoring of long-span bridges with a microwave radar interferometer

Bochen Zhang, Xiaoli Ding, Charles Werner, Kai Tan, Bin Zhang, Mi Jiang, Jingwen Zhao, Youlin Xu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

47 Citations (Scopus)


Structural health monitoring of long-span bridges is a critical process in ensuring the operational safety of the structures. In this paper, we present experimental results of monitoring the displacements of two long-span bridges in Hong Kong Ting Kau Bridge (TKB) and Tsing Ma Bridge (TMB) with a terrestrial microwave radar interferometer named the GAMMA Portable Radar Interferometer (GPRI). A technique for fusing the measurements from two receiving antennas of the radar instrument is proposed. In addition, a two-step phase unwrapping approach is also tested. The results reveal the bridge dynamic responses under different loading conditions, including winds, vehicle traffic, and passing trains. The results also show that the terrestrial microwave radar interferometer can be used to monitor the dynamics of long-span bridges with unprecedented spatial and temporal resolutions.

Original languageEnglish
Pages (from-to)252-264
Number of pages13
JournalISPRS Journal of Photogrammetry and Remote Sensing
Publication statusPublished - Apr 2018


  • Displacements
  • Dynamics
  • Long-span bridge
  • Microwave radar interferometer
  • Structural health monitoring (SHM)

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Computer Science Applications
  • Computers in Earth Sciences


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