Application Of Beidou-3 Dynamic Positioning In Vibration Monitoring Of Super High-Rise Buildings

The Beidou navigation system,as a satellite navigation and positioning system independently developed by China,has developed rapidly in the past few years.The construction of the Beidou-3 will be completed in June,when Chinese satellite positioning and navigation will also be at the world leading level.With the rapid development of Beidou,the actual application field is more and more wide.It is an important application field to use Beidou to monitor the deformation of super high-rise buildings.In this paper,the data of Beidou-3 is used to monitor the swing of super highrise buildings,and the research is carried out from the aspects of data quality,data processing,monitoring methods,and the establishment of swing model.The details are as follows:(1)The Beidou data quality is analyzed,and the collected Beidou data is analyzed from the aspects of data integrity rate,signal-to-noise ratio,multi-path effect,satellite visibility,water vapor and other influences.The integrity rate of collected data is above 90%,basically reaching 100%.The new ratio of satellites is analyzed from different angles,the signal-to-noise ratio of satellites of different constellations in different frequency bands,the signal-to-noise ratio of the same satellite in different frequency bands and the signal-to-noise ratio of Beidou-2 and Beidou-3 satellites are analyzed.The multipath effects of satellites of three constellations in different frequency bands are analyzed,and the multipath effects of Beidou-2 and Beidou-3 satellites are compared and analyzed.The visibility of the satellite on that day is analyzed,and the data quality affected by water vapor and multi-path effect is analyzed according to the phase residuals of sky map.(2)Using the standard time and frequency analysis method on the data of two monitoring time-frequency analysis,discovered the two cycles,respectively,in 3 to 5 hours,frequency of change within 3 to 5 Hz signal,explain the motion of the tall building is fixed,but also illustrate standard time and frequency analysis method can be applied in the high-rise building deformation monitoring.(3)The Beidou data using different calculating method,and compared with GPS,and BDS + GPS,three calculating result is close to formation of the original time series,the data precision of calculating result were similar,among the big dipper in some time will be better than that of GPS data precision,and the tendency of the whole BDS than GPS closer combination system,illustrates the possibility of applying single Beidou system in deformation monitoring.With the construction of the Beidou-3 system getting faster and faster and the number of satellites put into use increasing,the overall quality of the Beidou data and the accuracy of the calculation will become higher and higher.(4)In high-rise building deformation monitoring in GNSS methods,at the same time the InSAR auxiliary measurement of foundation,the foundation of the InSAR measuring way different from the traditional way,high measuring precision,but unable to long-term monitoring,therefore in the measurement of the same period of time will be the foundation of the InSAR results compared with the results of GNSS,the change trend of both basic consistent,illustrates the feasibility of using the results obtained from monitoring of Beidou.(5)The time series analysis method was used to model the x and y coordinates of the monitoring points,and a good change model was obtained.Good results were obtained in the short-term prediction,which did not differ much from the measured values.