Combined adjustment project of national astronomical geodetic networks and 2000' national GPS control network  

作　　者：YANGYuanxi ZHAMing SONGLijie WEIZiqing WANGZhouping OUYANGGuichong XUBilin WUXiaoping WANGJunqin 

机构地区：[1]Xi＇anResearchInstituteofSurveyingandMapping,Xi＇an710054,China [2]Xi＇anInformationalandTechnicalCenterofSurveyingandMapping,Xi＇an710054,China [3]ZhengzhouInstituteofSurveyingandMapping,Zhengzhou450052,China [4]TheFirstSurveyingTeamofTianjin,Tianjin300140,China [5]Xi＇anResearchInstituteofSurveyingandMapping,Xi＇an710054,China

出　　处：《Progress in Natural Science:Materials International》2005年第5期435-441,共7页自然科学进展·国际材料（英文版）

基　　金：Supported by National Natural Science Foundation of China (Grant Nos. 49825107, 40274002, 40174009 and 40474001)

摘　　要：The combined adjustment project of the nationwide astronomical geodetic networks and 2000’ national GPS control network involve 48519 terrestrial observational stations and 2666 GPS observational stations. In the terrestrial network, 25107 stations are height fixed and 23412 stations are in three dimensions. 440793 terrestrial observations and 183668 unknowns are involved in the adjustment. The three-dimensional observational models for the adjustment have been established. The crustal deformation influences and corrections are researched. Fast methods of solving partitioned adjustment for super large-scale geodetic network have been studied. The standard deviations of three-dimensional coordinates for all stations are evaluated. As a result of the combined adjustment, a unified national geodetic network with nearly 50000 stations is established, the high accurate three-dimensional geocentric coordinates are obtained. The standard deviation for geoid is averagely 0.2 m, for vertical deflection is about 1.5″, for the horizontal position is about 0.12 m, for the geodetic height is about 0.14 m, and for the three-dimensional position is averagely 0.3 m.The combined adjustment project of the nationwide astronomical geodeticnetworks and 2000' national GPS control network involve 48519 terrestrial observational stations and2666 GPS observational stations. In the terrestrial network, 25107 stations are height fixed and23412 stations are in three dimensions. 440793 terrestrial observations and 183668 unknowns areinvolved in the adjustment. The three-dimensional observational models for the adjustment have beenestablished. The crustal deformation influences and corrections are researched. Fast methods ofsolving partitioned adjustment for super large-scale geodetic network have been studied. Thestandard deviations of three-dimensional coordinates for all stations are evaluated. As a result ofthecombined adjustment, a unified national geodetic network with nearly 50000 stations isestablished, the high accurate three-dimensional geocentric coordinates are obtained. The standarddeviation for geoid is averagely 0.2 m, for vertical deflection is about 1.5', for the horizontalposition is about 0.12 m, for the geodetic height is about 0.14 m, and for the three-dimensionalposition is averagely 0.3 m.

关 键 词：astronomical geodetic network GPS network combined adjustment DATUM geocentric coordinates 

分 类 号：P228.4[天文地球—大地测量学与测量工程]