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本文阐述了地基干涉雷达测量的基本原理,介绍了地基干涉雷达中集成的两项关键技术,分析了地基干涉雷达应用于大型桥梁动态挠度监测的优点,构建了测量形变值向挠度值转换的变换模型。结合IBIS-S型地基干涉雷达安庆长江铁路大桥监测实例,选取了热、估信噪比这两个指标分析了所采集数据的质量,并且结合数据的特点,在无载的情况下讨论了地基干涉雷达的测量精度。最后基于动载条件下的数据分析了桥梁动态挠度变化的特征规律。
This paper describes the basic principle of ground-based interference radar measurement, introduces two key technologies integrated in ground-based interference radar, analyzes the advantages of ground-based interference radar applied to the dynamic deflection monitoring of large bridges, constructs the transformation to measure the change of deflection value model. Combined with the monitoring example of IBIS-S interference radar Anqing Yangtze River Railway Bridge, the quality of the collected data was analyzed by two indexes of heat and estimated signal-to-noise ratio. In the light of the characteristics of the data, the foundation Interference radar measurement accuracy. Finally, based on the data of dynamic load conditions, the characteristic law of dynamic deflection of bridge is analyzed.