中国国家A级GPS网的数据处理和精度评估.pdfVIP

25 2 Vol. 25, No. 2 1996 5 ACTA GEODAET ICA et CART OGRAPHICA SINICA Ma , 1996 A GPS * 李毓麟 刘经南 葛茂荣 陈俊勇 ( , 100830) DATA PROCESSING AND RESULT ACCURACY ANALYSIS OF CHINA NATIONAL A-ORDER GPS NETWORK Li Yulin, Liu Jingnan, Ge Maorong, Chen Jing ong ( N ational B ur eau of Surv ey ing and Map p ing , 100830) Abstract China National A-Order GPS Network is consisted b 27 stations, w hich is distributed evenl nationall and the average length of baselines is about 650km. During the period from Jul 25 to August 5 of 1992( i. e. , from da 208 to da 2 17 of the ear) , All of GPS dual frequenc receivers in the A-Net sites were measured sumultaneousl and continuousl . Fiducial Point T echnolog and Relax-Orbit T echnolog have been used for data processing of the A- Order GPS Netw ork. Some global tracking stations and t he national tracking stations, which have accu- rac ECEF coordinates and has observed data during the period, are constrained weightil to force the A- Order GPS Network refer to IT RF9 1 Frame. GAMIT GPS anal sis softw are was used for data process- ing. Results show ed that for single-da solut ions, the repeatabilit of baseline horizontal components is 10mm+ 0. 6 @ 10- 8@ S , and the one of baseline vertical components is better t han 40mm+ 0. 5@ 10- 8 @ S , where S is distace betw een GPS points w ith unit of mm. After network adjustment, t he relative accurac of baseline horizontal components is about 1@ 10- 8 . T he ECEF coordinate accurac of thd A- Order points in IT RF9 1 Reference Frame is beter than 0. 2m. Key words GPS Netw ork, Data pr