Research On Bridge Deformation Monitoring Based On High Rate GNSS

With the development of China's economy,various large-scale complex projects are increasing day by day.Especially in recent years,the construction and use of large-scale bridges have made bridge deformation monitoring a hot topic.With the development of the GNSS modernization process,the functions of software and hardware systems have been continuously improved.GNSS deformation monitoring is becoming more and more common in large bridges.This article is based on the Jinma Lake Bridge monitoring test as the data source,focusing on the application of GNSS in bridge monitoring,in-depth analysis of some influencing factors in bridge monitoring,the work done is summarized as follows:In order to verify the detection ability of high-frequency GNSS for height difference changes,according to the characteristics of Gaussian white noise in high-frequency GNSS deformation monitoring,Kalman filtering method is used to filter the GPS and GPS / BDS dynamic deformation monitoring simulation data.The results show that high Frequency GNSS can detect sub-centimeter-level distortion.After comparing the accuracy of the GPS system and the GPS / BDS system,the combined positioning of the GPS / BDS dual system can greatly increase the number of visible satellites,improve the spatial geometric distribution structure of the satellite,and the positioning accuracy is better than the GPS single system.This proves the high accuracy and reliability of GPS / BDS dual system combined positioning.Based on the GNSS dynamic deformation monitoring of the bridge,it is applied to practical cases to test the feasibility of its practical application.Through preliminary analysis of the sampling data of the GNSS deformation monitoring of the Jinmahu Bridge,the factors that affect the accuracy and reliability of its monitoring system are analyzed.The sample data uses wavelet filtering to reduce the impact of high-rate random noise and multipath effects.The high-rate GPS / BDS positioning results of the bridge observation station are filtered.Finally,based on the filtering results,a multi-faceted analysis is carried out to verify the effectiveness and practical development of the research method in this paper.The analysis results of the measured data show that the method is effectively extracted Bridge deformation information has important practical significance.