基于可变仰角阈值的低轨道量子卫星切换策略及性能分析Handover strategy of low orbit quantum satellite based on variable elevation angle threshold and its performance analysis
聂敏,车俊丽,杨光,裴昌幸
摘要(Abstract):
为了解决低轨道量子卫星之间的切换问题,根据量子卫星和地面站的连线与水平面之间夹角即仰角的变化,通过对该仰角的实际测量,提出基于可变仰角阈值的低轨道量子卫星切换策略。在达到最小仰角阈值时,地面服务中心发出切换指令,将对地服务卫星切换到下一颗量子卫星,使得星地量子通信保持连续。在此根据仰角大小的不同,分析仰角对卫星通信中量子态生存函数、信道误码率及信道容量的影响,建立它们之间的定量关系。仿真结果表明,当仰角θ=20°和θ=70°时,自由空间量子态生存函数、信道误码率及信道容量分别为0.56,0.033,0.5和0.92,0.012,0.97,由此可见,仰角大小对量子卫星通信性能有显著的影响。因此,为了保证卫星切换的成功率,根据对不同通信性能的要求,应自适应调整卫星的仰角阈值。
关键词(KeyWords): 低轨道量子卫星;仰角测量;卫星切换;量子通信;信道容量;生存函数
基金项目(Foundation): 国家自然科学基金资助项目(61172071);国家自然科学基金资助项目(61201194);; 陕西省自然科学基础研究计划基金资助项目(2014JQ8318);; 陕西省国际科技合作与交流计划基金资助项目(2015KW-013);; 陕西省教育厅科研计划项目(16JK1711)~~
作者(Author): 聂敏,车俊丽,杨光,裴昌幸
DOI: 10.16652/j.issn.1004-373x.2018.17.001
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