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低轨道卫星通信网络具有低时延的全球覆盖优势。文中提出了一种新的低轨卫星的波束判断方法。该方法首先需要确定用户是否在中心波束,如果不在中心波束,通过两个步骤确定用户所在的边缘波束:第一步采用二维波束算法;第二步采用三维波束算法。基于这些算法,在OPNET平台上实现了具有动态节点和网络协议的铱星通信仿真系统,并获得仿真结果。结果显示,最长可视时间准则明显增加了卫星服务的时间,并且验证了波束宽度模型的应用。
Low-orbit satellite communications networks have the advantage of low latency global coverage. In this paper, a new method for beam estimation of LEO satellites is proposed. The method first needs to determine whether the user is in the center beam, and if it is not in the center beam, determine the user’s edge beam in two steps: the first step uses a two-dimensional beam algorithm; the second step uses a three-dimensional beam algorithm. Based on these algorithms, Iridium satellite communication simulation system with dynamic nodes and network protocols is implemented on the OPNET platform and the simulation results are obtained. The results show that the longest visual time criterion significantly increases the satellite service time and validates the application of the beamwidth model.