Advances in Geodesy and Geoinformation, vol.73, no.2, pp.1-11, 2024 (ESCI)
This study investigates the effectiveness of
geodetic methods in Structural Health Monitoring (SHM), focusing on the
utilization of the High-Rate Global Navigation Satellite System (HR-GNSS) and
Robotic Total Station (RTS) for monitoring structural movements. Experiments
were conducted on a horizontal single-axis shake table to simulate various
frequencies and amplitudes. Data were analyzed using time series and Fast
Fourier Transform (FFT) techniques to evaluate the performance of geodetic
measurement methods in SHM studies. Two applications were conducted using a
single-axis shake table. In the first, the table oscillated at 0.25 Hz
frequency and 20 mm amplitude, while data from a GNSS receiver on the upper
table underwent processing with the TRACK module of GAMIT/GLOBK software using
the kinematic post-process (KPP) GNSS technique. In the second, the reflector
on the shake table moved through eight oscillations at various amplitudes and
frequencies, monitored automatically with a LEICA TPS1200 RTS. Time series and
FFT analyses were performed on all application data to determine oscillation
frequencies and amplitudes. Method accuracy was assessed by comparing these
values with data from the shake table's high-precision position sensor (Linear
Variable Differential Transformer-LVDT). Results showed good agreement between
HR-GNSS measurements and LVDT data, with a -1.6 mm amplitude difference for KPP
GNSS. Additionally, RTS measurements accurately determined frequency values,
with amplitude differences ranging from 0.2 mm to 6.5 mm. Root Mean Square
Error (RMSE) values for eight RTS tests, covering frequencies between 0.25-0.50
Hz and amplitudes between 4.5 - 73.4 mm, varied from 2.1 mm to 6.3 mm,
reflecting performance variability across different conditions.