发射窗口 meaning in English

launch window

So combine the item of " space environment primary numerical simulation platform " , this thesis is focus on the research of orbit design and analysis . the main achievements in this thesis can be summarized as follows : 1 . introduce the reference frame and time system used in orbit design particularly
本文结合“空间环境利用初级数值仿真平台”课题，进行轨道设计与分析的研究，主要作了以下几方面的工作： 1 、详细介绍了用于轨道设计的坐标系统和时间系统，分析了二体轨道特性和发射窗口的基本特性。
So combine the item of “ space targets surveillance photoelectricity telescopes arrays system ” , this thesis does research in developing space targets visualization system . the main achievement in this thesis can be summarized as follows : 1 . expatiate e the basic theory of satellite track dynamic , analyse the orbit characteristic of two - body problem and launch window , subastral point calculation , visibility and coverage analysis , two - line element sets
本文结合“空间目标监视光电望远镜阵系统”课题,进行了空间目标可视化系统的设计和研究,主要作了以下几方面的工作: 1 、阐述了卫星轨道动力学的基本原理,分析了二体轨道特性和发射窗口的基本特性,星下点轨迹计算、可见性和覆盖分析和两行根数。