Research On Operation And Its Applications Of Single Base Station CORS

Single base station CORS system with its flexible layout,operation simple maintenance,scalable sex is strong,low cost advantage,better meet the districts and counties and large project area small and medium scale continuous location service need,also for academics and other agencies to carry out the satellite navigation and positioning and performance testing instruments and equipment for teaching and scientific research offers the most cost-effective infrastructure construction plan.However,the traditional single base station CORS operation and maintenance is based on the receiving equipment supporting software for routine static data continuous archiving,differential data transmission and user background real-time monitoring and other functions.With the increasing accuracy,availability and reliability of the single-base station CORS system provided by users,especially in the face of prominent problems such as frequent atmospheric and space extreme weather changes and moderate geomagnetic storms in recent years,it is urgent to upgrade the traditional data-oriented operation and maintenance mode to data-oriented data quality and completeness.To carry out more scientific and reasonable theoretical research on CORS operation and maintenance of single base station.This thesis focuses on the prominent problems existing in the operation and maintenance process of CORS in the above single base station,and focuses on the daily data management,data quality evaluation standards and corresponding evaluation software development,as well as the completeness issues of space weather anomalies and extreme weather transit,and the quality verification of dynamic positioning service.The following research is carried out:(1)Aiming at the problem that traditional mainstream software is difficult to carry out all-round and multi-level quality check for multi-system,multi-mode and multi-frequency hybrid reference station data.Anubis software was introduced,and its secondary development was carried out to meet the construction of the operation and maintenance platform,and its availability was verified according to its performance in different positioning environments.The results show that the operation and maintenance platform developed based on Anubis is more flexible in providing data services to users,especially in multi-system fusion data monitoring,realizing the monitoring and visualization of raw data quality indicators,improving user service efficiency,and improving the operation and maintenance system.(2)Based on the developed data center operation and maintenance platform of single-base station CORS system,the impact of extreme environment on data quality indicators is studied.The abnormal environmental events were statistically analyzed and the monitoring performance of the platform under extreme environment was verified.The monthly data with frequent extreme environmental events were used to monitor the data quality index of CORS of single base station.The results show that when the ionosphere or troposphere is active,it will affect the data quality indexes such as data utilization,cycle hop,multipath effect and signal-to-noise ratio.Especially under the influence of snow,the signal-to-noise ratio(SNR)will have a certain loss,and the multipath effect will fluctuate significantly.(3)The lack of effective means for space weather monitoring in the region.Through the ionosphere and troposphere delay model and using the related data interpolation model,to reflect over the CORS station of ionospheric disturbance situation in the area of the ionosphere IRIM completeness indexes in the troposphere and reflect the troposphere perturbation completeness evaluation the TRIM annual statistics,to verify the effectiveness of the method for regional space weather monitoring.The experimental results show that when the IRIM and TRIM values exceed a certain range,users should be warned in time.(4)Aiming at the problem that the accuracy of RTK provided by CORS station will be affected in extreme environment,and it cannot provide users with centimeter-level positioning.By collecting the measured data,the PPK positioning accuracy in extreme environment is further analyzed and verified,and the UAV is used as the carrier to verify and analyze its service scope.The results show that in extreme space weather,although PPK is post-processing,its accuracy is still affected and a large number of floating point solutions appear.The accuracy of PPK technology based on UAV is similar to that of RTK in campus service,both of which can reach centimeter level.When the service distance exceeds 20 km,the accuracy begins to decline greatly.