地基SAR与地基RAR模式形变监测对比

采用地基SAR与地基RAR模式监测铁路桥在列车经过时的纵向垂直挠度形变，结果表明：1）2种模式提取的桥梁纵断面形变趋势与挠度基本一致，对应监测点的纵向垂直挠度形变精度最大偏差为1.85 mm，实现了桥梁的mm级形变监测；2）地基RAR模式数据处理快速简单，具有实时处理与直观可视化的精细形变表达能力；地基SAR模式数据量较大，数据处理存在一定的技术难度，但可同时反映面状整体形变趋势，具有全面捕捉形变的能力，也可提取特征点、线、面的形变量。

Comparative Experiment of Ground-Based SAR and Ground-Based RAR Mode Deformation Monitoring

We use ground-based RAR mode and ground-based SAR mode to monitor longitudinal vertical deformation of railway bridges as the train passes by. The experimental results show that: 1) the deformation trends and deflection are basically consistent between the two modes. Moreover, the RAR mode and SAR mode corresponding monitoring point of longitudinal vertical deflection deformation precision maximum deviation is 1.85 mm. Through external verification and analysis, both RAR and SAR modes can realize millimeter level deformation monitoring of the bridge. 2) RAR mode has fast and simple data processing, which has real-time processing and visualization capability. SAR mode has a relatively large amount of data, so it is technically difficult to process the data, but it can reflect the trend of planar deformation at the same time and has the ability to capture deformation of the object. SAR mode can also extract the deformation of feature point, lines and planes.