Research And System Implementation On Key Technology Of Automatic High Precision Measurement Based On Beidou

The traditional measuring technique is difficult to meet the requirements of current automatic high precision measurement due to its large workload and serious dependence on measuring personnel.In earthquake monitoring,landslides,terrain deformation monitoring,engineering deformation monitoring,and other fields,not only requires high precision of measurement data,but also have all-weather automatic remote monitoring,put forward the big challenge for high precision measurement technology.With the continuous development of satellite navigation technology,the positioning accuracy has been greatly improved,so that the satellite positioning technology is widely used in the field of high-precision measurement.This paper studies the development status of BDS(BeiDou Navigation Satellite System)and GPS in the field of high-precision measurement,especially in the field of deformation monitoring,designed and implemented a high-precision measurement system based on BDS+GPS,providing technical support for high-precision measurement.The system can automatically collect,transmit and settle GNSS data,and that result can meet the accuracy of millimetre-grade,and predict the deformation of the measurement area by solving result.Aiming at the functional requirements of high precision and automation of engineering measurement,this paper expounds GNSS positioning principle and observation data error,studies BDS+GPS combination positioning measurement technology,and analyzes the difference between BDS and GPS system.Paper discusses the overall design of high precision measurement system,expounds the object and content of high precision measurement,as well as the system research idea and technical route,and designs the overall architecture of high precision measurement system.By referring to the data types and measurement methods collected by the " Ashtech ProMark 220" receiver,the project's GNSS terminal was designed,and the project's server and client were designed with reference to the C/S architecture.Based on this architecture,a set of high precision measurement systems including GNSS terminals,servers and clients are designed and implemented.The system collects GNSS data automatically through the GNSS terminal,and then uploads the data file to the server regularly.By accessing the server and downloading the GNSS data file,the client can obtain the coordinate information of the location of GNSS terminal,and can remotely check whether its position has changed at any time,so as to achieve the purpose of automatic monitoring.Paper for high-precision measuring server and client software system design and implementation in detail,and also focus on the high-precision measuring terminal software and hardware system design and implementation.At the end of the paper,according to the needs of geotechnical landslide monitoring project of Niushou Mountain in Nanjing,the automatic high-precision measurement system based on BDS is applied to this project.Through this project,a series of steps required for the implementation of high-precision measurement project are introduced in detail,from the process of laying out points,selecting datum points,to data automatic transmission,data processing,data analysis,etc.,and the high-precision measurement system is tested,the software operation interface is displayed,and the transformation from laboratory project to engineering project is realized.