Research On The Application Of GNSS-RTK Technology In The Dynamic Deformation Monitoring Of Super High-rise Buildings

Compared with the general types of buildings, super high-rise structure under the influence of wind loads, sunshine effect, earthquakes and other factors will have a more pronounced dynamic deformation. With the application of GPS-RTK technology and dynamic deformation monitoring Kalman filtering method, long-term real-time dynamic monitoring develops rapidly. However, a single constellation system does exist some limitations in all aspects of continuity, accuracy, efficiency, availability and reliability.In this paper, Tianjin TV Tower is used for monitoring object with GPS/GLONASS/BDS and GPS/GLONASS GNSS-RTK system in the dynamic deformation monitoring test carried out on super high-rise structure. The main research results are as follows:Firstly, GPS/GLONASS/BDS GNSS-RTK system can receive GPS, GLONASS, BDS satellite constellation signals, which will greatly increase the number of visible satellites and the satellite geometry, have a better distribution of the composition, reduce the accuracy of the dilution factor and improve the positioning accuracy. GPS/GLONASS/BDS system not only improves the constellation-redundancy, but also enhances the positioning accuracy and reliability.Secondly, through the actual test ultra-high dynamic deformation monitoring, particularly the compare between GPS/GLONASS/BDS and GPS/GLONASS GNSS-RTK system, the BDS system have played a very important role in the monitoring system to enhance the continuity, accuracy, efficiency, availability and reliability of each aspects. It is foreseeable that, with the continued development and improvement of the BDS system, GNSS-RTK technology will be further improved.Thirdly, using Kalman filtering method and the program of Matlab Software for processing and analysis of dynamic deformation monitoring data can effectively eliminate the effects of low-frequency noise and get a more accurate value after the structural vibration frequency spectrum analysis, and has been monitoring the vibration track, main vibration direction and vibration curve structure to verify the feasibility of GNSS-RTK technology combined with Kalman filtering in the dynamic deformation monitoring and data processing analysis of super high-rise structure. With the development and improvement of the corresponding software program, its usefulness will be more prominent.Fourthly, on the use of GNSS-RTK technology, we carried out Tianjin TV Tower dynamic deformation monitoring in three wind conditions. Calculation and analysis of monitoring data emerges vibration frequencies correspond to different wind loads, and the vibration frequencies are consistent with the structure's natural vibration frequency. This proves the applicability and accuracy of GNSS-RTK technology in super high-rise structure's dynamic deformation monitoring.Finally, with the analysis of the error sources in GNSS-RTK dynamic deformation monitoring and the data analysis of dynamic deformation monitoring in Tianjin TV Tower test, we obtained specific methods of error reduction.