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Establishment of 2000 National Geodetic Control Network of China and It's Technological Progress

CHEN Jun-yong1,YANG Yuan-xi2,WANG Ming3,ZHANG Yan-ping1,TANG Ying-zhe2,LI Hui4,CHENG Peng-fei5,SUN Feng-hua6,ZHANG Peng1,GUO Chun-xi7(1.National Geomatics Center of China,Beijing 100044,China;2.Xian Research Institute of Surveying and Mapping,Shanxi Xian 710054,China;3.Seismological Prediction Institute,Beijing 100036,China;4.Seismological Institute,Wuhan 430071,China;5.Chinese Academy of Surveying and Mapping,Beijing 100039,China;6.Xian Information Technique Institute of Surveying and Mapping,Xi'an 710054,China;7.Geodetic Data Processing Center,Xi'an 710054,China)  
2000' National Geodetic Control Network of China is an important fundamental scientific engineering project in China.It consists of three parts which are establishment of 2000 National GPS Geodetic Network,its combination adjustment with national astro-geodetic network and 2000 National Gravity Fundamental network.There are five characteristics in the project:① various kinds of scientific branches involved,for example classical geodesy,space geodesy,physical geodesy,astronomy,modern data processing and computer science etc.② large amount and different sorts data to be processed,ex.2 600 GPS points,46 000 geodetic baselines,259 gravity points,nearly 50 000 geodetic points and 150 000 unknown variables in the combination adjustment of national astro-geodetic network and 2000 national GPS geodetic network.③ Long time span of the observed data in these geodetic networks,such as 12 years span of GPS observation data in 2000 national GPS geodetic network,and the national astro-geodetic network was completed almost 30 years ago.④ Large area covered by these geodetic networks,ex.the 2000 national GPS geodetic network and national astro-geodetic network cover most lands and islands of China,while 2000 national gravity fundamental network extends from main land to Hong Kong,Macau and Nansha islands.⑤ Many factors have to be taken into consideration in the data processing,e.g.the influence of crust movement,internal plate movement,and regional deformation on the geodetic data in the networks,the changes of geodetic datum,astronomy constants and epoch effect on the data reduction and processing of the networks.The major innovation of this project is in 3 parts:① Horizontal and vertical dimensions in national astro-geodetic network were separated from each other.After the combination adjustment with national 2000 GPS geodetic network a unified geocentric 3D coordinates for it was obtained.② To improve accuracy of geodetic coordinate frame 15 times which is from ±5 m to ±0.3 m and 4 times of gravity points which is from ±25×10-8 ms-2 to ±7×10-8 ms-2.③ To improve processing technique from classic least-square method to which is combination with least-square,robust estimation and variance component evaluation.The accuracy and reliability of results are enhanced.
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