SPOT BEAM JUDGEMENT ALGORITHM IN LEO SATELLITE BASED ON OPNET  

基于OPNET的低轨卫星的点波束确定算法(英文)

作　　者：于佳[1] 宗鹏[1] 

机构地区：[1]南京航空航天大学航天学院

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2011年第3期269-275,共7页南京航空航天大学学报（英文版）

摘　　要：Low earth orbit（LEO）satellite constellation networks have a predominance of global coverage with low propagation delays.A new spot beam judgement algorithm is presented in LEO satellite constellation.At first,judgement of central spot beam is considered.Then the judgement of outlying spot beam is achieved by two algorithms.One is 2-D space judgement algorithm and the other is 3-D space judgement algorithm.Based on these algorithms,an Iridium model implemented on OPNET with dynamic topology nodes and network layer protocols is presented and simulation results are obtained.The simulation results show that the satellite serving time has obviously increased through the method of longest visible time criterion and the equal beam width model is validated.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。

关 键 词：satellite communication spot beam JUDGEMENT CONSTELLATION longest visible time 

分 类 号：TN927[电子电信—通信与信息系统]