The GPS control segment includes satellite command and control, mission planning, constellation management, monitoring stations, and ground antennas.

GPS控制段包括卫星指挥和控制、任务规划、协同管理、检测站以及地面天线。

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For enhancing the ability of survivability and auto-control, the requirement of autonomous navigation is brought forward to the formation flying spacecraft and satellite constellation.

为了提高自主生存与自主管理能力，对各类星座及编队飞行的航天器提出了自主导航与定位要求。

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Then a control method considering the J2 perturbation based on Encke's linearization equation is proposed to maintain the relative motion of the constellation.

进而导出了带有J2项摄动的环绕星相对运动方程，并给出了基于惯性笛卡尔坐标系运动学变量的相对轨道控制方法。

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Then a control method considering the J2 perturbation based on Encke's linearization equation is proposed to maintain the relative motion of the constellation.

进而导出了带有J2项摄动的环绕星相对运动方程，并给出了基于惯性笛卡尔坐标系运动学变量的相对轨道控制方法。

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