中文摘要：

为了满足工程需求，充分利用观测资料信息，快速提供较好的卫星位置预报精度是必要的。在精密定轨的基础上，结合某GEO（地球同步轨道）卫星连续3天的测距观测资料，研究了使用GEO卫星的不同弧长的观测资料进行定轨和轨道预报的精度。结果表明，每天间隔11小时选取该段观测开始30分钟后的5分钟资料进行定轨，可以得到一个为期2天、精度好于15m的预报轨道。

英文摘要：

For satisfying the requirement of the project it is necessary to predict quickly a high-precision orbit of the satellite making full use of the observations. Based on the precise orbit determination and the three days＇ continual ranging observation of the GEO artificial satellite, the attainable precision in predicting and determining the orbit of the GEO artificial satellite is studied for the different arc-lengths＇ observation data. The result shows that by extracting 5 minutes＇ observation data at an interval of 11 hours＇ in one day, the prediction precision can be better than 15m for the 2 days＇ arc-length.