Bridge deformation monitoring usually adopts contact sensors,and the implementation process is often limited by the environment and observation conditions,resulting in unsatisfactory monitoring accuracy and effect.Gro...Bridge deformation monitoring usually adopts contact sensors,and the implementation process is often limited by the environment and observation conditions,resulting in unsatisfactory monitoring accuracy and effect.Ground-Based Synthetic Aperture Radar(GBSAR)combined with corner reflectors was used to perform static load-loaded deformation destruction experiments on solid model bridges in a non-contact manner.The semi parametric spline filtering and its optimization method were used to obtain the monitoring results of the GBSAR radar’s line of sight deformation,and the relative position of the corner reflector and the millimeter level deformation signals under different loading conditions were successfully extracted.The deformation transformation model from the radar line of sight direction to the vertical vibration direction was deduced.The transformation results of deformation monitoring and the measurement data such as the dial indicator were compared and analyzed.The occurrence and development process of bridge deformation and failure were successfully monitored,and the deformation characteristics of the bridge from continuous loading to eccentric loading until bridge failure were obtained.The experimental results show that GBSAR combined with corner reflector can be used for deformation feature acquisition,damage identification and health monitoring of bridges and other structures,and can provide a useful reference for design,construction and safety evaluation.展开更多
为了提高地基雷达系统的监测精度,提出一种新的高精度的地基合成孔径雷达干涉GBSAR(Ground Based SAR)监测技术。融合了GBSAR关键技术以及数据处理理论,对影响测量精度的误差项进行了分析研究并从3个方面(雷达系统、数据获取、数据处理...为了提高地基雷达系统的监测精度,提出一种新的高精度的地基合成孔径雷达干涉GBSAR(Ground Based SAR)监测技术。融合了GBSAR关键技术以及数据处理理论,对影响测量精度的误差项进行了分析研究并从3个方面(雷达系统、数据获取、数据处理)具体给出了相应的精度提高措施。基于变形监测系统(IBIS-S)对GBSAR理论研究进行实验验证。实验表明GBSAR技术对于目标体的监测精度较高。最终得到GBSAR技术产生的误差的途径主要源自数据采集的过程。展开更多
GBSAR(Ground Based SAR)技术可实现静态动态结合的高精度高分辨率的形变监测。介绍了GBSAR技术的工作原理,并分析了该技术的精度影响因素。利用该技术对天津新海河大桥进行静态加载试验,结果表明GBSAR技术可测定桥梁的高精度挠度变化...GBSAR(Ground Based SAR)技术可实现静态动态结合的高精度高分辨率的形变监测。介绍了GBSAR技术的工作原理,并分析了该技术的精度影响因素。利用该技术对天津新海河大桥进行静态加载试验,结果表明GBSAR技术可测定桥梁的高精度挠度变化且可进行频谱分析。展开更多
基金Science and Technology Innovation Program of Hunan Province(No.2021RC4037)National Natural Science Foundation of China:Deformation Monitoring Key Technology and Damage Mechanism Research on Data Fusion among GB-SAR and Multi-sensors(No.41877283)Scientific Research Project of Hunan Provincial Department of Natural Resources(No.2021-18)
文摘Bridge deformation monitoring usually adopts contact sensors,and the implementation process is often limited by the environment and observation conditions,resulting in unsatisfactory monitoring accuracy and effect.Ground-Based Synthetic Aperture Radar(GBSAR)combined with corner reflectors was used to perform static load-loaded deformation destruction experiments on solid model bridges in a non-contact manner.The semi parametric spline filtering and its optimization method were used to obtain the monitoring results of the GBSAR radar’s line of sight deformation,and the relative position of the corner reflector and the millimeter level deformation signals under different loading conditions were successfully extracted.The deformation transformation model from the radar line of sight direction to the vertical vibration direction was deduced.The transformation results of deformation monitoring and the measurement data such as the dial indicator were compared and analyzed.The occurrence and development process of bridge deformation and failure were successfully monitored,and the deformation characteristics of the bridge from continuous loading to eccentric loading until bridge failure were obtained.The experimental results show that GBSAR combined with corner reflector can be used for deformation feature acquisition,damage identification and health monitoring of bridges and other structures,and can provide a useful reference for design,construction and safety evaluation.
文摘为了提高地基雷达系统的监测精度,提出一种新的高精度的地基合成孔径雷达干涉GBSAR(Ground Based SAR)监测技术。融合了GBSAR关键技术以及数据处理理论,对影响测量精度的误差项进行了分析研究并从3个方面(雷达系统、数据获取、数据处理)具体给出了相应的精度提高措施。基于变形监测系统(IBIS-S)对GBSAR理论研究进行实验验证。实验表明GBSAR技术对于目标体的监测精度较高。最终得到GBSAR技术产生的误差的途径主要源自数据采集的过程。
