利用GRACE A 卫星的星载GPS 观测数据，采用非差动力学低轨卫星定轨方法，解算了2012年1月11日至18日的卫星轨道，将得到的结果与G FZ发布的RS O轨道进行对比分析，并通过SLR观测数据进行轨道的校验。结果表明：定轨精度满足低轨卫星精密定轨的要求，与RS O轨道比较，在 X、Y 、Z方向的均方根误差的平均值分别为4．7 cm、4．3 cm和4．9cm ；通过SLR观测数据进行校验，残差平均值为-1．6cm，均方根误差为4．7cm．%Using zero-difference satellite-borne GPS data ,the orbit of GRACE A satel-lite by dynamic method with GPS observations is determined during the period from January 11 to 18 ,2012 .The orbit results will be compared with RSO which were released by GFZ , and be verified by SLR observation .The comparison results show that the accuracy of orbit determination can meet the requirement of LEO satellite .Compared with the RSO orbit in X ,Y ,Z direction ,the average of RMS is 4 .7 cm ,4 .3 cm and 4 .9 cm respectively .Calibra-ted with SLR observation ,the mean of residuals is -1 .6 cm ,and the RMS is 4 .7 cm .
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