Abstract
A distance-restrained atmospheric parameter correction (DR-APC) model is presented in this study to reduce the influences of atmospheric parameters and electromagnetic wave power attenuation on dynamic deflection measurement of bridges using ground-based synthetic aperture radar (GB-SAR). The proposed model considers electromagnetic wave transmission distance together with factors of bridges geometric configuration, instrument layout and atmospheric refractive index. First, the theoretical DR-APC model is derived with restrictions of the wave propagation distance, the height from radar unit to bridge lower surface and the elevation angle of radar unit. Second, the DR-APC model is determined based on continuous time-series displacement of 12 corner reflectors fixed on tripods in a stable environment area. Finally, the DR-APC model is applied to GB-SAR monitoring signals of three bridges to verify its effectiveness. The results show that the proposed model has an ability to improve the accuracy of dynamic deflection measurement using GB-SAR.
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