Slope Network Monitoring System Based On Embedded Multifrequency GNSS-RTK Location

The imperceptible and dangerous slope deformation will cause serious geological disasters such as mudslides and landslides.Such geological disasters have caused a large number of personal safety accidents and economic and property losses all over the country in recent years.Therefore,real-time monitoring of slope stability and early warning of upcoming geological disasters have always been a research direction that has attracted much attention in the field of engineering safety.With the upgrading of deformation monitoring technology and the successful networking of Beidou satellite navigation system,the Global Navigation Satellite System(GNSS)is more and more widely used in the field of slope displacement deformation and geological disaster monitoring.In this paper,through the analysis of the slope deformation monitoring requirements and the combination of GNSS-RTK differential technology and embedded technology,a set of cost-effective,high-precision and simple layout GNSS embedded slope displacement monitoring system is designed.This paper takes the high-risk slope prone to deformation as the research object,and designs a set of GNSS-based deformation monitoring technology and The real-time stability three-dimensional deformation monitoring system of the high-risk slope based on Linux system embedded technology,and the system reliability and simulated displacement experiments were carried out.The project in this paper is taken from the key research and development project of Shaanxi Province "Application Research on Intelligent Networked Landslide Monitoring and Early Warning Technology Based on Domestic Independent Controllable and 5G Platform(No.2021SF-483)".This system can realize GNSS slope displacement at low cost It has great theoretical significance and practical application value in monitoring and early warning.In the process of designing an embedded GNSS monitoring system,this paper first studies the principle model of carrier phase difference technology,the feasibility and advantages of using GNSS-RTK technology for displacement monitoring,and analyzes the overall function and performance requirements of the slope monitoring system.Reasonable random model.Secondly,an embedded multi-functional monitoring terminal software and hardware platform based on the ARM-Linux system is built,and the GNSS receiver,core calculation software application,and communication link are integrated under the low-cost embedded terminal,realizing multiple monitors in the same environment.Functional high-precision differential analysis,and then design two base station systems and a variety of monitoring station network communication methods,and realize the displacement monitoring accuracy of the CORS network base station and self-designed reference station dual-system differential monitoring in the horizontal direction of millimeter(mm).Corresponding matching design is carried out on the server side and the webpage side,and the server-side GNSS receiving software is developed and the webpage side monitoring is provided to the user to realize intuitive real-time display,so as to realize the user-oriented three-dimensional baseline data display.Design experiments to verify the reliability and stability of the system,conduct data collection experiments to verify the data quality,use different base station systems for differential,compare the positioning accuracy effects of different satellite systems and different baseline lengths,and verify the combined system and short baseline positioning effects,basically It is verified that the threedimensional direction error within the 10-kilometer baseline of the system is less than ±15mm.Finally,a simulated displacement experiment is carried out to prove that the low-cost self-built reference station and the embedded GNSS monitoring station have reliable deformation monitoring capabilities.