Construction And Application Of CORS

Since twenty-first Century, with the rapid development of geo spatial informationscience, electronic science, computer technology, network technology andcommunication technology, modern science and technology,"3S"(the global positioningsystem (GPS), geographic information system (GIS) and remote sensing (RS)technology)is developing rapidly, the traditional surveying and mapping science hasexperienced a profound technological change. Continuously Operating Reference Station(CORS) emerge as the times require, CORS is the combination of the global positioningtechnology and network technology, communication technology and other disciplines.The emergence of CORS technology makes the geodetic survey, engineering survey andmany other space technology development to achieve breakthrough. CORS technologybecomes the core technology of the earth mass spatial data acquisition. In order to meetthe needs of social development and economic construction, China has accelerated thedevelopment and construction of CORS integrated service system, many city, industryhas built the CORS system, and has been officially put into use, has made tremendousbenefits.According to the characteristics of CORS technology, the present situation, thecore principle, application of the development of the. In Beijing, the global satellitepositioning service system as an example, introduces the construction andimplementation of the system function. And with the application of CORS technology inthe actual mapping work as the research object, combined with the actual engineering theapplication analysis. The main contents are as follows:In this paper, the development of CORS technology, and in the construction anddevelopment of the inside and outside the country are investigated; systematicallyexpounded the GNSS positioning principle, mathematical model, the basic theory ofCORS system, CORS system’s basic structure and composition; a detailed analysis ofprinciple and characteristics of RTK technology when the network before themainstream; This paper introduced the application of RTD technology. The coordinatetransformation method, and its accuracy of estimation model is reviewed;The core principle of CORS system is analyzed considering the various errorcorrection model, establish, convective motion coordinates differential correction. Adetailed analysis of the error sources of CORS positioning system, and eliminate or weaken the control measures, summarizes some classical correction model; introducesthe CORS system testing program and the accuracy evaluation method;The Beijing Continuously Operating Reference Station service system (BJCORS)construction and application is introduced. This paper describes the system structure andfunction, introduces the service provided; introduces the system test function of BJCORS,through testing the data accuracy analysis of BJCORS system; the current operation andapplication, summarizes the characteristics of the system and advantage;Combined with the implementation of the project, the application of CORS inmunicipal road were analyzed and discussed. The paper introduces the general situationof the project implementation plan, introduces the CORS system based on network RTKin zonal topographic mapping, road center line, the construction control survey,investigation and measurement, discusses the issues in the RTK network link in the needto pay attention to. Measuring method is compared to conventional, analyses theadvantage of network RTK in engineering. To test the network RTK measurement results,and the test data for statistical analysis, get the accuracy of evaluation result; theadvantages and disadvantages of RTK based on network application of CORS system inmunicipal road engineering is summarized.Current situation of the development and application of CORS system is reviewed inthis paper. The future development trend is prospected. Combined with the constructionand application experience of BJCORS, summarizes the construction, Beijing CORSsystem maintenance, development, application of successful experience; the developmentprocess of domestic CORS construction problems and deficiencies are summarized, andput forward the improvement scheme. Combined with the characteristics and advantagesof CORS, the development trend of CORS is prospected, the development trend of CORSwas deduced, the future construction of CORS model are discussed.