地面微波干涉雷达与GPS测定桥梁挠度的对比试验分析

Comparative Test Analysis for Determining Bridge Deflection by Using Ground-Based SAR and GPS

将步进频率连续波技术、合成孔径雷达技术和干涉测量技术相结合而构成的地面微波干涉雷达系统,可实现对地面目标的静动态高精度监测。介绍了利用该技术的IBIS系统在武汉阳逻长江公路大桥所开展的动态挠度测试情况,并与GPS测量结果进行对比分析。结果表明,地面微波干涉雷达技术不仅可以精细地测量桥梁挠度的动态变化,且精度高,可以真实地反映结构物的动态变形特征。

By the stepped frequency-continuous wave technology,synthetic aperture radar and interferometric techniques,combining integrated ground-based SAR,can achieve high-precision monitoring of static and dynamic targets on the ground.This paper describes the dynamic deflection test carried out by the IBIS in the Wuhan Yangluo Yangtze River Bridge,and GPS measurements were compared.The results show that the ground-based SAR can not only fine to measure the dynamic changes in the bridge deflection,high accuracy;and can truly reflect the structure of the dynamic deformation characteristics,its high sampling rate feature provides a new means of technology for the bridge vertical bending test.