The semi-physical node controls the interface of Ethernet according to the satellite orbit and simulates the handoff of ISL, and so changes the topology of satellite network.

其中半实物仿真节点是自行设计的。 仿真节点根据卫星运行轨道通过控制以太网接口模拟卫星网络星际链路切换，改变网络拓扑结构。

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The key points of the design under the restrained conditions, such as orbit node period, regressive cycles, regressive period, repeat period and others, were also presented.

并给出了在轨道交点周期、回归圈数、回归周期、重复周期和其他因素等约束条件下的轨道设计要点。

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