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Development of a 3-DOF Structural Displacement Sensor Based on a Two-Stage Kalman Filter

  • Jun Yeon Chung
  • Kiyoung Kim
  • Jaemook Choi
  • Hoon Sohn
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

Structural displacement is one of the important indicator for monitoring and assessing the safety of civil infrastructures. GPS-RTK has been one of the widely used sensor for displacement measurement, but the GPS-RTK has low sampling rate and its precision and accuracy are easily affected by stability of satellite and environmental conditions. To overcome the limitations of GPS-RTK, a novel 3-DOF structural displacement sensor is developed in this study. The developed sensor measures 3-DOF displacement, velocity and acceleration of large-scale civil structures based on data fusion of acceleration measured from a force feedback accelerometer, and velocity and displacement obtained from a low cost GPS-RTK using two-stage Kalman filtering. The developed 3-DOF structural displacement sensor offers the following advantages over the existing GPS-RTK sensors: (1) The proposed sensor can measure 3-DOF displacement, velocity and acceleration simultaneously, (2) A better accuracy (around 2 mm) and a better sampling rate (up to 100 Hz) can be achieved, compared to the conventional GPS-RTK sensors, and (3) The performance is less affected by weather conditions and multi path problems, which deteriorate the performance of conventional GPS-RTK sensors. The performance of the proposed sensor was validated through a series of lab scale tests and a field test conducted on Yeongjong Grand Bridge.

Keywords

Displacement estimation Sensor data fusion Two-stage Kalman filter Civil engineering structures monitoring GPS-RTK 

Notes

Acknowledgment

This research was supported by the Field-oriented Support of Fire Fighting Technology Research and Development Program funded by the Ministry of Public Safety and Security (MPSS-소방안전-2015-72)

References

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Copyright information

© The Society for Experimental Mechanics, Inc. 2019

Authors and Affiliations

  • Jun Yeon Chung
    • 1
  • Kiyoung Kim
    • 1
  • Jaemook Choi
    • 1
  • Hoon Sohn
    • 1
  1. 1.Department of Civil and Environmental EngineeringKorea Advanced Institute of Science and TechnologyDaejeonSouth Korea

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