An integrated GPS-accelerometer data processing technique for structural deformation monitoring
An integrated GPS-accelerometer data processing technique for structural deformation monitoring
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DOI：
10.1007/s00190-006-0092-2
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发表时间：
2006-12-01
影响因子：
4.4
通讯作者：
Dai, W. J.
中科院分区：
文献类型：
--
作者：
Chan, W. S.;Xu, Y. L.;Dai, W. J.
全球定位系统（GPS）正积极应用于大型土木工程结构在风荷载作用下的静、动力位移响应测量。然而，多路径效应和低采样频率影响GPS位移测量的精度。另一方面，加速度计不能可靠地测量静态和低频结构响应，但可以精确地测量高频结构响应。因此，本文探讨了将GPS测量信号与加速度计测量信号相结合，以提高结构总（静态加动态）位移响应测量精度的可能性。综合数据处理技术，使用经验模式分解（EMD）和自适应滤波器。一系列的运动模拟台测试，然后在现场使用三个GPS接收器，一个加速度计，和一个运动模拟台，可以模拟各种类型的运动定义的输入波的时间历史在一个预定义的静态位置。所提出的数据处理技术应用于记录的GPS和加速度计数据，以找到静态和动态位移。将这些结果与运动模拟台产生的实际位移运动进行比较。对比结果表明，该方法可以显著提高结构总位移的测量精度。
Global Positioning System (GPS) is being actively applied to measure static and dynamic displacement responses of large civil engineering structures under winds. However, multipath effects and low sampling frequencies affect the accuracy of GPS for displacement measurement. On the other hand, accelerometers cannot reliably measure static and low-frequency structural responses, but can accurately measure high-frequency structural responses. Therefore, this paper explores the possibility of integrating GPS-measured signals with accelerometer-measured signals to enhance the measurement accuracy of total (static plus dynamic) displacement response of a structure. Integrated data processing techniques using both empirical mode decomposition (EMD) and an adaptive filter are presented. A series of motion simulation table tests are then performed at a site using three GPS receivers, one accelerometer, and one motion simulation table that can simulate various types of motion defined by input wave time histories around a pre-defined static position. The proposed data processing techniques are applied to the recorded GPS and accelerometer data to find both static and dynamic displacements. These results are compared with the actual displacement motions generated by the motion simulation table. The comparative results demonstrate that the proposed technique can significantly enhance the measurement accuracy of the total displacement of a structure.