导航卫星一般采用近圆轨道，当卫星轨道偏心率或者轨道倾角接近于零时，利用GPS卫星开普勒轨道根数拟合卫星广播星历会出现一些问题。
When their orbit eccentricity or inclination are near zero, some problems may occur when the GPS Kepler orbit elements fitting method is applied to fit their broadcast ephemeris parameters.
本方法具有以下优点： （1）本方法适用于任意偏心率的卫星轨道。
This method has following advantages: (1)The method is useful for satellite orbit of any eccentricity.
并且根据卫星群偏心率与倾角综合的分离思想，讨论了两种策略，使得卫星群的构形可通过每个成员的轨道要素简单表出。
The satellites follow a combined eccentricity and inclination vector separation strategy, so that the group geometry can be expressed simply by the orbital elements of each member.
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