摘要
针对普通广域差分ＧＰＳ实时定位系统中对数据通讯链的高要求，提出分布式广域差分ＧＰＳ实时定位系统，解决了预报精密星历、外推卫星相对钟差等技术难点。经过对该系统的中试实践，证明该系统对改善ＧＰＳ实时定位精度是有保障的。该系统的特点是降低数据通讯链工作频度和实时性的要求，并通过增设区域性差分基准站来计算卫星相对钟误差和电离层改正，以减少主控站的计算工作量。
A technology of “Distributed Wide Area Differential GPS (DWADGPS)”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. DWADGPS 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 DWADGPS 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 DWADGPS technology is suitable for a developing country like China.
出处
《测绘学报》
EI
CSCD
北大核心
1998年第1期1-8,共8页
Acta Geodaetica et Cartographica Sinica
