Research On Deformation Monitoring Of Long-span Bridges Based On Beidou System

With the rapid development of economy and technology,more and more large-scale bridges are constantly being built,but due to the difficulty of construction when building large-scale bridges,the design structure of large-scale bridges is also complex and diverse,and the bridges are regularly carried out throughout the day The monitoring of real-time and real-time automatic measurement is very necessary,but most of the existing bridge deformation monitoring methods use GPS system.In order to get rid of the dependence on GPS system,the Beidou system independently developed by China is mainly used for high-precision monitoring of bridge deformation.research direction.This article aims at the characteristics of the Beidou system,lists the different methods of satellite positioning,analyzes the characteristics of these methods and the accuracy of the measurement,to list the various causes of errors in the measurement process and the methods of eliminating errors.The most important algorithm for determining the whole-week ambiguity in the positioning solution is studied,and the results obtained from the operation data processing process are analyzed to determine the feasibility of the Beidou system in the field of bridge deformation monitoring.This article aims to study the application of Beidou system in the field of bridge deformation monitoring,mainly including the following research contents and corresponding conclusions:(1)Summarize the research results at home and abroad,analyze the existing bridge monitoring methods and summarize the advantages and disadvantages of various methods,and summarize the advantages and implementation methods of the Beidou system in the field of bridge deformation monitoring.In order to study the realization method of bridge deformation monitoring,the content and composition of the bridge deformation monitoring system are designed according to the method and precision requirements of the bridge deformation monitoring by discussing the meaning and method of deformation monitoring;(2)Introduce the positioning principle of the Beidou navigation system in high-precision positioning,analyze the advantages and disadvantages of several differential positioning methods in carrier phase measurement,and summarize the error items generated by the Beidou system during the positioning process.After analyzing the errors,a method to reduce the errors is proposed to ensure that high-precision positioning can be achieved;(3)Research on the high-precision algorithm for the Beidou system positioning.The most important thing for the Beidou system to perform high-precision measurement is to determine the full-period ambiguity of the carrier phase signal.After introducing several ambiguity determination algorithms,the LAMBDA algorithm is used for ambiguity.The degree is fixed.The main features of the LAMBDA algorithm are the relatively accurate calculation results and short calculation time.Then use Turbo Edit method to improve the cycle slip phenomenon that may occur in the process of determining the overall cycle ambiguity of the carrier phase signal.The improved method can effectively detect the location of the cycle slip phenomenon;(4)Explain the advantages of precision single-point positioning technology,analyze the feasibility of the application of precision single-point positioning technology in the field of bridge deformation monitoring,and lay out the principles and locations of the measurement points in the process of using the Beidou system bridge deformation monitoring For analysis.Explain the data calculation process of Beidou system,introduce software data acquisition,data processing,parameter setting methods and data calculation.The error value of most stations is within 10 cm,and the error values of each station in the E direction are 0.03 m,0.02 m,0.04 m,0.02 m,0.08 m,0.02 m,0.04 m,0.03 m,0.05 m,0.03 m,the error values in the N direction are 0.05 m,0.03 m,0.03 m,0.03 m,0.12 m,0.02 m,0.02 m,0.02 m,0.04 m,0.04 m,the error values in the U direction are 0.04 m,0.09 m,0.07 m,0.10 m,0.16 m,0.05 m,0.04 m,0.06 m,0.12 m,0.06 m.From these results,it can be seen that most of the positioning errors are within 10 cm.The positioning accuracy of the Beidou system can basically meet the deformation monitoring requirements of large-span bridges.Application in the field of bridge deformation monitoring becomes possible.