BDS/GPS Data Processing And Analysis For High-rise Building Deformation Monitoring

In recent years, more and more high-rise buildings appear in people’s vision, and many of them are more than 500 meters. With the increasing height of the building, in order to ensure safety, deformation monitoring is necessary in the process of construction and after completion. GNSS technology can effectively overcome the inadequate of traditional monitoring methods to achieve real-time monitoring, which is provided with considerable practical value. Especially when construction environment is complex and satellite occlusion is severe, BDS/GPS dual system co-locating can enhance system reliability, improve processing efficiency and calculate baseline fast.In this paper, "Ping’an International Financial Center" is taken as an example. In order to meet the need of deformation monitoring, BDS-compatible receivers are used, data collection methods and post-processing algorithms in complex construction environment are discussed, problems caused by poor data quality are solved, and monitoring data are processed effectively. The main research work include following aspects:(1)Relying on BDS/GPS dual system data, compare coordinate errors got by combinations of different monitoring points to put forward a new baseline solver program. Based on this program, height of the building is measured and affection of temperature and external loads are analyzed.(2)Considering defects of root mean square error and signal to noise ratio as denoising performance metrics, smoothness indicator is added in this paper. Relying on BDS/GPS dual system data, combine three indicator values to determine optimal parameters. Based on this program, data is processed by wavelet threshold to complete gross error detection and repairment, deformation feature extraction and natural frequency calculation in north-south, east-west and elevation directions.(3)Threshold value is a key factor for denoising effect. In order to determine the most appropriate value, the paper summarizes and optimizes common threshold formulas, and takes BDS/GPS dual system data as a case to analyze and compare.For using BDS/GPS dual system to do real-time dynamic deformation monitoring of high-rise buildings, research work and achievements of this paper have important reference and significance in theory and practice.