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Li Yulin, Liu Jingnan, Ge Maorong, Chen Jingyong (National Bureau of Surveying and Mapping,100830)  
China National A Order GPS Network is consisted by 27 stations, which is distributed evenly nationally and the average length of baselines is about 650km. During the period from July 25 to August 5 of 1992(i.e., from day 208 to day 217 of the year), All of GPS dual frequency receivers in the A Net sites were measured sumultaneously and continuously. Fiducial Point Technology and Relax Orbit Technology have been used for data processing of the A Order GPS Network. Some global tracking stations and the national tracking stations, which have accuracy ECEF coordinates and has observed data during the period, are constrained weightily to force the A Order GPS Network refer to ITRF91 Frame. GAMIT GPS analysis software was used for data processing. Results showed that for single day solutions, the repeatability of baseline horizontal components is 10mm+0.6×10 -8 × S , and the one of baseline vertical components is better than 40mm+0.5×10 -8 × S , where S is distace between GPS points with unit of mm. After network adjustment, the relative accuracy of baseline horizontal components is about 1×10 -8 . The ECEF coordinate accuracy of thd A Order points in ITRF91 Reference Frame is beter than 0.2m.
【CateGory Index】: P228.4
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