The variations of velocity difference have obvious periodicity, which coincides with the satellite orbitperiod.
速度差各分量的变化具有很明显的周期性且与卫星轨道的运行周期相吻合。
2
Global coverage and sun synchronization are the essential properties of the earth observation satellites, which are assumed by designing the orbitperiod and inclination.
对地观测卫星轨道具有全球目标覆盖和太阳同步两种特性,通过设计轨道周期和轨道倾角可以获得这些特性。
3
The shape of this orbit isn't consistent; it varies over time, over a period of about a thousand years.