Optimal Methods of RTK-GPS/Accelerometer Integration to Monitor the Displacement of Structures

Sensors

Jinsang Hwang²  Hongsik Yun²  Sun-Kyu Park²  Dongha Lee¹ 

[1] Department of Civil, Architectural & Environmental Engineering, Sungkyunkwan University, Suwon 440-746, Korea;

关键词: RTK-GPS;    accelerometer;    integration;    displacement monitoring;   

DOI  :  10.3390/s120101014

来源: mdpi

【 摘 要 】

The accurate measurement of diverse displacements of structures is an important index for the evaluation of a structure’s safety. In this study, a comparative analysis was conducted to determine the integrated RTK-GPS/accelerometer method that can provide the most precise structure displacement measurements. For this purpose, three methods of calculating the dynamic displacements from the acceleration data were comparatively analyzed. In addition, two methods of determining dynamic, static, and quasi-static displacements by integrating the displacements measured from the RTK-GPS system and the accelerometer were also comparatively analyzed. To ensure precise comparison results, a cantilever beam was manufactured onto which diverse types of displacements were generated to evaluate the measurement accuracy by method. Linear variable differential transformer (LVDT) measurements were used as references for the evaluation to ensure accuracy. The study results showed that the most suitable method of measuring the dynamic displacement with the accelerometer was to calculate the displacement by filtering and double-integrating the acceleration data using the FIR band-pass filter. The integration method that uses frequency-based displacement extraction was most appropriate for the integrated RTK-GPS/accelerometer method of comprehensively measuring the dynamic, static, and quasi-static displacements.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland