| Deformation is an extremely common phenomenon.Objects in nature will deform under the action of various external forces.Deformation that exceeds a certain threshold will pose a threat to human life and property safety,so deformation monitoring is becoming increasingly important.According to the monitoring object and the size of the deformation body,the deformation monitoring can be divided into global deformation monitoring,regional deformation monitoring and engineering deformation monitoring.Compared with conventional measurement,deformation monitoring has higher requirements on measurement accuracy,which generally needs to reach the millimeter level.Satellite navigation and positioning technology has become one of the important technical means in the field of deformation monitoring due to its advantages of all-weather capabilities,high position accuracy,fully automatic,real-time,no limitation of weather conditions in observation,and the ability to simultaneously measure three-dimensional coordinates.With the establishment and improvement of Bei Dou Navigation Satellite System,the Beidou and GNSS multi-system combined positioning presents a strong advantage in the accuracy of deformation monitoring data,and has great research space and application prospects.This topic is aimed at the problem of engineering deformation monitoring,one of the deformation monitoring.The key technology for high-precision measurement data calculation automation based on Beidou / GNSS is analyzed at home and abroad,and the Beidou / GNSS automatic calculation system is designed and implemented.The system can automatically collect,store,manage,calculate and analyze Beidou / GNSS data with an accuracy of up to millimeters,which meets the needs of general engineering deformation monitoring applications.During the research of the Beidou / GNSS automatic calculation system,systematically studied the calculation principle of Beidou / GNSS data,focusing on analyzing the sources of errors in the process of data calculation,and thus discussing the overall system design,formulate system research ideas and technical routes,design the overall architecture of the system,and introduce the key techniques in detail involved in the realization of data calculation automation.On this basis,a complete set of the Beidou / GNSS automatic calculation system including Beidou / GNSS monitoring terminal and Beidou / GNSS automatic calculation platform was designed and implemented The detailed design of the Beidou / GNSS monitoring terminal and the Beidou / GNSS automatic calculation platform system server and the system client are classified description.The system automatically collects the original observation data of Beidou + GPS satellites through the Beidou / GNSS monitoring terminal,and uploads it to the Beidou / GNSS automatic calculation platform in time after the collection is completed.The platform system will complete the function of automatic data calculation and deformation analysis after receiving the restrictions entered by the user.Then the coordinate data gathered after completing automatic data calculation and deformation analysis data can be personalized in the form of multiple types of charts.At the same time,the operation monitoring and configuration management functions of the Beidou / GNSS monitoring terminal can be realized.At the end of the paper,the Beidou / GNSS automatic calculation system is appling to the actual engineering deformation monitoring project to provide monitoring guarantee for the construction process of the excavation during the construction of the Nanjing Garden Expo Park in Jiangsu.Through this project,the system application situation and results were introduced in detail.Through the Beidou / GNSS monitoring network established at the construction site,the surrounding landslide-prone points with high-risk factor were monitored to avoid serious construction accidents and turn the theory achievement into the achievement of practicing. |
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