Research On The Application Of GPS Technology In The Control Measurement Of High-speed Railway Bridge

With the rapid development of national economy,more and more high-speed railway projects are emerging,and most high-speed railway lines are in the form of Bridges.Before the 20 th century,the traditional measuring methods were used in the construction control network of large Bridges,that is,the angle-side network or triangular network measured by theodolite and rangefinder.The traditional measuring method is restricted by the topography,the workload and the external environment.With the generation of GPS and the continuous development and improvement of technology,the layout of construction control network of large high-speed railway Bridges has become extremely simple.Horizontal position accuracy of GPS can reach mm level,which can completely meet the precision requirements of construction control network.The application of GPS technology to high-speed railway construction control network is of great significance for both the development of GPS technology and the control survey for large Bridges.In this paper,the GPS technology application in high speed railway construction control network control measurement and precision analysis is studied,first elaborated the development of GPS and the basic principle of GPS satellite positioning,secondly it introduces the design of GPS control network and data preprocessing,finally combining Ann nine railway Yangtze river bridge on the north approach span control network measurement as an example,the GPS application in high speed railway Bridges measure control network was studied and the precision analysis,The result sini cate that relative static GPS positioning can satisfy the precision requirement of the large bridge construction control network of high speed railway.The research content and results include:(1)The research of GPS technology in bridge control network includes technical design,layout principle,survey method,data processing and precision analysis,etc;(2)The precision of GPS measurement results meets the requirements after research and analysis,and the measurement results of GPS technology can meet the plane control requirements of super-long bridges;(3)The precision of GPS control survey results is studied and demonstrated by means of traverse survey.The results show that all precision indexes of GPS control survey results fully meet the requirements and can be used for on-site construction survey.