Application And Certain Technical Question Research Of Precise Positioning Service Based On CORS

CORS (Continuous Operational Reference System) can provide continuous high precision spatialization criterion for Survey department, provide continuous and comprehensive real-time GPS monitoring data for timing, navigation and disaster monitoring, and also provide real-time, reliable, and efficient spatial information services for traffic management, urban construction, and earthquake prediction, etc.. In recent years, with the continuous improvement and widely practical applications of CORS positioning theory, construction of integrated CORS network has entered a period of rapid development in China, national and regional CORS comprehensive service systems have been built or are under construction. With the different levels of CORS comprehensive service systems' appear, large amount of GNSS continuous tracking station observation data not only has greatly changed the field operations in GPS positioning, but also makes a major change on the mode of high-precision GPS data processing. Therefore, how to apply rich CORS network data resources efficiently to mapping and related fields become the hot spot and difficult point. For high-effect usage of rich CORS data resource and going deep into the latent service excavating ability of the system, this paper will deep analysis CORS system for high-precision positioning technology, that including operation pattern, static and dynamic state high precision GNSS data processing etc..Thesis includes the following aspects:1. Detailed analysis any group network operation mode's effect on original group edge operation and group net operation based on CORS system, and give some opinion and suggestion with guidance function.2. Go deep into the high precision static state GPS data processing technique based on CORS, the main contents include consideration factor of static state data processing, influence of different network pattern for static solution, convergence of the static solution and precise point positioning based on CORS system correct information. Through researching high-precision static data processing based on CORS network, we know CORS network has not only changed the original static measurement mode, but also greatly improved the efficiency of static measurement and precision of location, thus promoting the rapid development of the static measurement.3. Study high precision dynamic state GPS data processing technique based on CORS. The main contents are analysis of dynamic solutions and quasi-dynamic solution accuracy, and high-precision monitoring of landslide hazard analysis.4. Study the stability and motion characteristic of the CORS sites. Since GPS data processing is affected by various errors, the time series of CORS site coordinate not only containing white noise but also random walk noise and flicker noise. The paper decompose and reconstruct the CORS site coordinate time series in multi-resolution, analysis stability and motion characteristic of CORS sites.