Introduce the reference frame and time system used in orbit design particularly. Analyzed the orbit characteristic of two-body problem and launch window.
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。
With the increase in use of mega-frame structures, the main frame beam-column reasonable arrangement becomes the key problem of a design.
随着巨型框架结构应用的日益增多，主框架梁柱的合理布置成为巨型框架设计的关键问题。
The basic design frame of the hardware and software of the whole control system is given here and some concrete problem in the experiments is described here in detail.
基本勾勒出整个控制系统的硬件和软件设计基本框架，详细描述一些实验中的具体的细节问题。
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