The third chapter presents the constellation model, basic theory of aerospace dynamics and the LEO/MEO perturbation analysis. Finally, it introduces numerical simulation evaluation method of satellite coverage performance.
第三章重点对星座模型、航天动力学的基本理论和中低轨轨道摄动分析进行阐述，文末并对卫星覆盖性能的数值仿真评估方法进行了介绍。
参考来源 - 模型多目标演化算法（OMEA）在星座优化设计中的应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Yet satellite coverage doesn't always allow for good snapshots; nor does the weather, which can put clouds in the way.
然而，卫星的覆盖范围并非常常可以拍到清晰的快照；由于有云层的遮挡，气候也无法保证快照的效果。
The answer was: by continuous, day-and-night telecommunications coverage broadcast via satellite and projected on giant video screens in each city.
答案是：通过连续的，昼夜不停的卫星通信广播录制，并且在每个城市的巨型电视屏幕上投影。
The main selling-points of satellite radio are its crystal-clear sound, near-universal coverage and a broad choice of advertising-free content, from sports to chat to music.
卫星广播的主要卖点是其清晰语音，无广告干扰的丰富的内容选择——从体育到谈天到音乐。
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