中文摘要：

GEO卫星频繁的轨道机动对高精度、实时不间断的导航服务需求提出了更高要求.针对该问题,提出了基于机动力模型的轨道确定与外推方法,尝试利用机动期间的卫星推力信息建立机动力模型.从而实现连续的动力学定轨,保证了机动期间导航服务的实时性和高精度要求.利用北斗系统中GEO卫星实测数据进行了定轨试验与分析.结果表明：采用基于已知机动力模型的轨道位置确定精度优于50 m,明显优于目前几何法定轨的精度,为机动期间导航卫星定轨提供一种的新技术思路,对于提高导航服务精度和连续性具有一定的参考意义.

英文摘要：

Real time,continuous and high precision navigation service is needed during the course of geostationary orbit （GEO） satellite maneuvering,which is very frequent for about every 20 days.How to determine the orbit for the GEO satellite is a key factor for the navigation system.A new strategy of precise orbit determination （POD） and predication was studied in this paper,which was based on the modeling of thrust force during the maneuvering course.Telemetry and telecontrol data during satellite maneuvering were adopted to establish thrust force model,with the orbit before satellite maneuvering adopted as initial orbit,the orbit could be determined and predicated in a dynamical method,meeting the navigation user requirements.Precise and continuous satellite service could be ensured in this new strategy.The results indicated that：during the GEO satellite maneuvering,position accuracy could be achieved less than 50 m,which was better than that of geomctric method.This strategy enabled a new technical method for the orbit determination during the satellite maneuvering,which could become a significant progress for the precision and continuity indexes in the satellite system.