中文摘要：

为了解决采用地面GPS连续运行参考站进行高精度定轨问题，采用轨道积分方法，利用国家测绘局8个GPS连续运行参考站和9个中国周边IGS连续运行参考站，设计了多种天数的区域性定轨计算方案，研究了轨道确定的理论、步骤和参数设置规律。结果表明：3天轨道解的平均精度为0．19m，5天轨道解的平均精度为0．21m，7天轨道解的平均精度为0．28m，3天解平均定轨精度最高，优于0．2m，证明了并非随着地面数据天数的增加而精度随之增加，可以用最少的数据量获得最优的定轨结果。定轨试验计算的是区域性轨道，与全球轨道相比，存在一定的偏差。该成果对我国定轨研究特别是未来的广域增强系统轨道预测具有一定的指导意义和参考价值。

英文摘要：

To resolve the problem of GPS orbit determination using GPS CORS stations, the orbit arc method was used, based on 8 GPS CORS station from SBSM（State Bureau of Surveying and Mapping） and 9 GPS CORS station closer to China which belong to IGS organization, the data processing project about GPS orbit determination of different days in local area was designed, And the detailed approach and various parameter setup of GPS orbit determination were described. The conclusion was drawn that the average precision of GPS orbit determination about 3 days was 0.2 meters, the average precision of GPS orbit determination about 5 days was 0.21 meters, the average precision of GPS orbit determination about 7 days was 0.28 meters, and 3 days result which better than 0.2 meters is the best result in the several days result. It was proved that GPS orbit precision was not improved with the day number increasing, the best orbit determination would be achieved by least data. Another conclusion was that these GPS orbit determination was local orbit, and systemic error was occurred when compared to global orbit. This research has certain guiding significance and reference value for GPS orbit determination in WAAS system and maybe valuable.