China's high-precision GPS geodetic control network built _20

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China's high-precision GPS geodetic control network established
 
 
Net adjustment associated units. The network coordinate projection, adjustment had used 3 different software with the adjustment calculated for each examination and comparison of edge,You are not allowed to view links. Register or Login, this three kinds of software are GAMIT, Beinese, GPSADJ (Wuhan University of Surveying and Mapping preparation) 3 software difference between the calculated maximum soil each 3 ~ ± 5cm = National GPS Network as B-class observation time lasted more than 4 years,You are not allowed to view links. Register or Login, and the use of different types of GPS equipment, plus more measuring points. Therefore,You are not allowed to view links. Register or Login, according to year of observation and instrument type, the corresponding number of sub-divided into the same is very natural. But in the whole network adjustment,You are not allowed to view links. Register or Login, the operator must return to a decadent epoch a single. Then the coordinates of each sub-network to be corrected, mainly taking into account the measuring point where the rate of crustal movement through the same adjustment to correct. Results in 3 selected as the final result with a value. Its accuracy with the situation on the A-GPS for horizontal repeatability better than 2 × lO,You are not allowed to view links. Register or Login, the vertical direction is not less than 7 × lO. Absolute accuracy (relative to 12 -) no less than = o1111. Of B is decorated with GPS. Better than 4 × 10_, respectively, and 8 × 10, the absolute accuracy (relative center of the earth) of not less than ± 1111 National A-and B-class GPS geodetic control network built. Indicates that China has a decimeter absolute accuracy of 3-dimensional geodetic coordinate system has been basically established, it will be China's space technology and space for the basic data, such as moving the old real-time location technology to provide an accurate and reliable frame of reference. In addition, the Chinese A-and B-class GPS ground control most of the same potential. Were carried out with a joint measurement standards to determine their normal. At the same time many of the same points and the original is also determined by the classical earth and coastal tide gauge stations were measured together. All of these will monitor the crustal movement in China. China's demand of local geoid set, the new boss to net splicing and conversion, and global change monitoring of sea level rise in the provision of basic data. The early 21st century sustainable development of China's economic and social contribution