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With the distance between the rover and reference station increasing, conventional RTK technology which positioning accuracy and reliability of the reduced scope of services was limited (generally less than 10km), the cost increased and operational efficiency was low, data link communications was narrow, the difficulties of ambiguity and so on, which has been far from satisfying people’s needs. Therefore, the city continuously operating reference station network system came into being.In this paper, Ningbo continuously operating reference station system (NBCORS) as an example to obtain the following results:Briefly introduces the purpose and significance of this topic, research status, of the objectives, content, and methods; and CORS establishment of the station’s four mainstream technology (VRS, FKP, MAC, ARS) of doing a detailed analysis of for the construction of CORS system provides technical support; of the CORS error sources and ways to eliminate or weaken.The CORS system of the entire testing process as such:base stations selection and construction of base stations, base station network and coordinate the joint measurement of conversion issues, the system detection method of positioning accuracy, availability of space, time availability, system compatibility study.Positioning accuracy in the detection system, the summary of the reliability of positioning accuracy have been tested CORS method (known as static detection method, real-time dynamic observed and compared the results after the detection method, the geometric dynamic rules relative path detection methods and baseline length of the detection method, etc.) based on the proposed new detection methods have different detection time, detection of different elevation, the surrounding environment detection, the system reliability of the detection method is more complete; in space availability, select the open terrain, nearby high-rise buildings, trees, lakes edge, hillside, valley and other places to study; availability in time to study the impact of the system initialization time positioning accuracy and a variety of factors:the effective number of satellites, GODP value to the reference station has been the distance and the surrounding environment, and has done a quantitative analysis; in the system compatibility, choose 8 different models of dual-frequency receivers were studied.
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