中文摘要：

基于星载GNSS的低轨卫星精密定轨是目前大地测量领域的研究热点,也是解决我国对地观测卫星精密轨道确定最有效的手段。讨论了目前低轨卫星星载GNSS精密定轨的精度评价方法,并通过对GRACE卫星的实测和仿真数据的处理和分析,讨论了这些方法在不同观测条件下的有效性与局限性。

英文摘要：

Based on satellite-bone GNSS,the precision orbit determination（POD） for low earth orbit satellites is becoming one of hot spots in the realm of geodesy and geomatics.It is also one of means of POD for the domestic earth-oriented satellites.In this paper,accuracy evaluation methods used currently are discussed in details as well as their advantages and disadvantages.The experimental results are carried out so as to verify the related methods on different conditions and to check their validity and limitations.