交点周期 meaning in English

node cycle

In the first , this article introduces the knowledge of orbit designing , then this article summarizes the basic methods and principles of orbit designing . in the later , this article describes the conception of node period about orbit designing emphatically which has been advanced by the writer . at the same time , this article describes the process of the writer ' s analysing and designing the orbit of earth spying satellite particularly with the conception . in the last , this article describes the wirter ' s analysing and simulating the designing results
本文首先介绍了轨道设计的基本知识，然后总结了轨道设计的基本的方法和原则。在随后部分重点对卫星轨道设计中交点周期的概念提出了自己的看法，同时应用此结果详细分析和设计了对地侦察卫星的太阳同步回归轨道，最后对此设计结果进行详细仿真分析。