Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Structural Engineering and Mechanics Volume 89, Number 6, March25 2024 , pages 589-599 DOI: https://doi.org/10.12989/sem.2024.89.6.589 |
|
|
|
High-rate Single-Frequency Precise Point Positioning (SF-PPP) in the detection of structural displacements and ground motions |
||
Mert Bezcioglu, Cemal Ozer Yigit, Ahmet Anil Dindar, Ahmed El-Mowafy and Kan Wang
|
||
| Abstract | ||
| This study presents the usability of the high-rate single-frequency Precise Point Positioning (SF-PPP) technique based on 20 Hz Global Positioning Systems (GPS)-only observations in detecting dynamic motions. SF-PPP solutions were obtained from post-mission and real-time GNSS corrections. These include the International GNSS Service (IGS)-Final, IGS real-time (RT), real-time MADOCA (Multi-GNSS Advanced Demonstration tool for Orbit and Clock Analysis), and real-time products from the Australian/New Zealand satellite-based augmentation systems (SBAS, known as SouthPAN). SF-PPP results were compared with LVDT (Linear Variable Differential Transformer) sensor and single-frequency relative positioning (SF-RP) solutions. The findings show that the SF-PPP technique successfully detects the harmonic motions, and the real-time products-based PPP solutions were as accurate as the final post-mission products. In the frequency domain, all GNSS-based methods evaluated in this contribution correctly detect the dominant frequency of short-term harmonic oscillations, while the differences in the amplitude values corresponding to the peak frequency do not exceed 1.1 mm. However, evaluations in the time domain show that SF-PPP needs high-pass filtering to detect accurate displacement since SF-PPP solutions include trends and low-frequency fluctuations, mainly due to atmospheric effects. Findings obtained in the time domain indicate that final, real-time, and MADOCA-based PPP results capture short-term dynamic behaviors with an accuracy ranging from 3.4 mm to 8.5 mm, and SBAS-based PPP solutions have several times higher RMSE values compared to other methods. However, after high-pass filtering, the accuracies obtained from PPP methods decreased to a few mm. The outcomes demonstrate the potential of the high-rate SF-PPP method to reliably monitor structural and earthquake-induced ground motions and vibration frequencies of structures. | ||
| Key Words | ||
| high-rate GNSS; precise point positioning; real-time; RT-PPP; SBAS; SF-PPP; single-frequency; structural health monitoring | ||
| Address | ||
| Mert Bezcioglu: Department of Geomatics Engineering, Gebze Technical University, Gebze, Turkiye Cemal Ozer Yigit: Department of Geomatics Engineering, Gebze Technical University, Gebze, Turkiye Ahmet Anil Dindar: Department of Civil Engineering, Gebze Technical University, Gebze, Turkiye Ahmed El-Mowafy: School of Earth and Planetary Sciences, Curtin University, Perth, Australia Kan Wang: National Time Service Center, Chinese Academy of Sciences, Xi'an, China; University of Chinese Academy of Sciences, Beijing, China | ||