Fusion of dual polarization Sentinel-1 data for monitoring deformation of large bridges
In response to the problem of low density and accuracy of point like targets in some areas when facing complex bridges with synthetic aperture radar,this paper proposes a method of integrating dual polarization Sentinel-1 data to monitor large bridges.Firstly,the time-series deformation results of bridge VV and VH polarization were obtained using PS-InSAR and SBAS-InSAR techniques;Then,based on the difference in response ability of different polarization data to the same area,a dual strategy is used to optimize and fuse the dual polarization results to improve the density and accuracy of bridge deck point targets.Finally,compare and analyze the differences between dual polarization and single polarization results.The results show that in the low coherence area on the bridge deck,VV and VH polarization data can complement each other,and the fusion result increases the number of point targets by 15％to 20％compared to a single polarization result.The results indicate that the dual polarization fusion method proposed in this article improves the utilization and mining of radar image information,and significantly improves the deformation monitoring results of suspension and cable-stayed bridges,making it suitable for most bridges.
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