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中文摘要：
在分析低轨卫星轨道变化特征的基础上，考虑GPS广播星历参数的物理意义明确、生成速度快、精度高、参数少等特点，设计了一套适于低轨卫星在轨位置计算的星历参数，并对其算法进行了试算。同时对GPS广播星历15参数法与设计的25参数法进行了拟合对比，结果表明，同样条件下25参数法应用于低轨卫星轨道拟合时精度较高。
英文摘要：
On the basis of the orbit character of the LEO satellite and the advantages of definite physical meanings, quickly creating, high precision, fewer parameters of GPS broadcast ephemeris, a new sort of ephemeris parameters for calculating LEO satellite location is designed and analyzed through a example. Some significant comparisons are made between the 15-parameter method of GPS broadcast ephemeris and the designed 25-parameter method, the results show that the designed 25 parameters method has a higher precision for LEO satellite orbit fitting under the same condition.
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