Large-scale CORS Benchmark Stability Monitoring Study

Today the majority of provinces and cities in China have built their own CORS system along with a continuous run positioning services integrated system(Continuously Operating Reference Stations,abbreviated to CORS)construction booms in recent years and Most of them have been put into operation and achieved good results.As one of the important infrastructure of geo-spatial framework in our country,the CORS system needs to provide for the customers with accurate three-dimensional positioning services.So its stability of the reference station network of CORS system is critical to protect the accuracy and reliability of distribution data of the CORS system,and that is one of key factor to ensure that the system can operate normally and provide services with high quality.It is also an important content in the process of system operation and maintenance.This paper take part of the base station site of yunnan province integrated positioning service system(YNCORS)as an example to explore the way to use the GAMIT/GLOBK software to study and analyze each base station site stability of the CORS system in a wide rangeand ensure the accuracy and effectiveness of base station site coordinates.At last,CORS site stability conclusions are drew according to the research results and put forward the corresponding solutions.The conclusion show that:all of the base stations contains are stable in the study area,at the same time it proved that the method in the stability analysis of large-scale CORS station is feasible.