Great Xi'an CORS Construction And Evaluation Of Use

With the development of national economy, city construction is in an unprecedented period of rapid development. The theory, technology, equipment and methods of mapping have rapidly changed as well. The appearance of CORS completely changed vicious circle of the measure on "control points laid - destroyed - and then laid again" and become a new hot spot in city mapping. However, as a new generation of measurement mode, how does the CORS work? Does its measuremental accuracy meet the requirements of the city? What are the defects of CORS in the city mapping? The paper basing on the CORS system which has been completely set up by Xi'an Institute of Surveying and Mapping, carries out comprehensive and systematic analysis, for providing the useful reference to the future construction of CORS system in other cities.Firstly, in the light of CORS system of Xi'an Institute of Surveying and Mapping, the paper obtains reasonably reliable conclusions basing on evaluation to the distribution and ionospheric delay of reference station, noise ratio of the carrier signal, multipath pseudo range. Secondly, basing on the test data, the authenticity of CORS is illustrated from the inner and outer precision measurement results. Then, by experimental practice in two fields, it is proved the system is not perfect, and the improvement is necessary. Finally, fitting the national slogan of "West Ham integration, mark, the customs - Tianshui Economic Zone", a feasibility study to extend the system program is presented, and the difficulties in CORS points will be marked with extension the system. Hence, it has guided significance on the future development and application of Xi'an CORS.