GPS數(shù)據(jù)的處理方法在結(jié)構(gòu)變形監(jiān)測的應(yīng)用_外文翻譯

摘要

全球定位系統(tǒng)(GPS)現(xiàn)在正積極應(yīng)用靜態(tài)和動態(tài)位移法在有風(fēng)的情況下對大型土木工程結(jié)構(gòu)進(jìn)行監(jiān)測。然而,多路徑效應(yīng)和低采樣頻率的精度影響GPS位移測量。另一方面,加速度計靜態(tài)和低頻不能有效的措施結(jié)構(gòu)反應(yīng),但可以精確測量高頻結(jié)構(gòu)的反應(yīng)。因此,本文僅探討GPS與測量結(jié)合的可能性，信號提高對測量準(zhǔn)確度的(靜態(tài)加上動態(tài))一個結(jié)構(gòu)的位移響應(yīng)。集成數(shù)據(jù)處理技巧,利用兩個經(jīng)驗?zāi)Ｊ椒纸?EMD)和自適應(yīng)濾波的方法。一系列的運動模擬臺試驗，然后根據(jù)站點使用三個GPS接收器,一個加速度、“桌子”和一個運動仿真可以模擬各種類型的運動定義為輸入，在波時間歷程一個預(yù)先定義的靜態(tài)的位置。該數(shù)據(jù)處理技術(shù)應(yīng)用：記錄的GPS和加速度計數(shù)據(jù)，發(fā)現(xiàn)兩者都有靜態(tài)和動態(tài)位移。這些結(jié)果通過實測位移運動產(chǎn)生運動仿真的“桌子”。比較結(jié)果表明,該技術(shù)能顯著提高測量準(zhǔn)確度。

關(guān)鍵詞：GPS變形監(jiān)測、結(jié)構(gòu)、加速度計；綜合數(shù)據(jù)處理、靜態(tài)和動態(tài)位移法、EDM的經(jīng)典分解模式；自適應(yīng)濾波器


Abstract

Global Positioning System (GPS) is being actively applied tomeasure 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 highfrequency 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.

Keywords：GPS structural deformation monitoring ・Accelerometer ・ Integrated data processing ・ Static and dynamic displacements ・ Empirical mode decomposition (EMD) ・ Adaptive filter