分布式广域差分GPS实时定位系统.pdf

测绘学报98011.htm 测 绘 学 报 科技期刊 ACTA GEODAETICA et CARTOGRAPHICA SINICA 1998年 第27卷 第1期 No.1 farbary 1998 分布式广域差分GPS实时定位系统* • 陈俊勇 刘经南 张燕平 胡建国 葛茂荣 (国家测绘局，北京，100830) ON DISTRIBUTED WIDE AREA DIFFERENTIAL GPS REAL TIME KINEMATIC POSITIONING SYSTEM Chen Junyong ，Liu Jingnan, Zhang Yanping, Hu Jianguo, Ge Maorong (National Bureau of Surveying and Mapping, Beijing，100830) Abstract　A technology of “Distributed Wide Area Differential GPS (D- WADGPS) ”is suggested and described in the paper in order to solve the so called “key difficult problem ”, i. e. the telecommunication chain in the WADGPS. 　　D-WADGPS is base on the techniques and corresponding software for the computation of prediction precise ephemerides of GPS satellites and their clock biases according to the data collected at the permanent tracking stations in China. After the practical test, it is demonstrated that with the D-WADGPS technology the accuracy for the real time kinematic positioning at a moving GPS receiver is around 1~3 meters within a distance of more than 1 500 km. 　　The behaviors for the technology are to set up some regional GPS fiducial station in the operational area. The main tasks of these stations are to compute and transmit GPS satellite clock biases and ionosphere corrections by using the prediction precise ephemerides. Then it can obviously reduce the frequency and the need of the real time computation of the main station, and the telecommunication between the main station and tracking stations as comparison with the tradition WADGPS. Therefore D-WADGPS technology is suitable for a developing country like China. Keywords GPS,Rea