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中文摘要：
本文探讨了利用星载GPS数据实现平方根推广卡尔曼滤波（SR—EKF）定轨的方法，采用SR—EKF对两颗GRACE卫星进行了定轨试验计算，并将计算结果与Bernese5．0的计算结果进行了比较，比较分析表明：采用SR—EKF方法进行GRACE卫星定轨可以得到优于10cm的定轨精度；经验力参数可以平衡几何观测信息和动力模型信息，但增大了观测异常对定轨结果的影响；对位置和速度进行噪声补偿可以减弱观测异常对定轨结果的影响，但有可能使轨道出现系统性偏差。
英文摘要：
This paper discusses square root extended Kalman filtering（SR-EKF） for satellite orbit determination with onboard GPS observations. Two GRACE satellites orbits are computed by using SR-EKF, and compared with the orbits of satellites computed by Bernese 5. 0. By comparison and analysis, the following conclusions can be drawn： The orbits of GRACE which are computed by using SR-EKF are better than 10 cm; Empirical accelerations parameter can balance the observational information and dynamic information, but it increases the influence of abnormal measurement; The influence of abnormal measurement can be decreased when the noise of the satellite position and velocity are compensated, but systematic error may appear in the orbit in this case.
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