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

作　　者：聂敏 车俊丽 杨光 裴昌幸[3] NIE Min;CHE Junli;YANG Guang;PEI Changxing(School of Communications and Information Engineering,Xi’an University of Posts and Telecommunications,Xi’an 710061,China;School of Electronics and Information,Northwestern Polytechnical University,Xi’an 710072,China;State Key Laboratory of Integrated Service Networks,Xidian University,Xi’an 710071,China)

机构地区：[1]西安邮电大学通信与信息工程学院,陕西西安710061 [2]西北工业大学电子信息学院,陕西西安710072 [3]西安电子科技大学综合业务网国家重点实验室,陕西西安710071

出　　处：《现代电子技术》2018年第17期1-5,10,共6页Modern Electronics Technique

基　　金：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)~~

摘　　要：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。According to the change of the included angle(elevation angle)between the line connecting the satellite with ground station and horizontal plane,a low orbit quantum satellite handover strategy based on variable elevation angle threshold is proposed by means of the actual measurement of the elevation angle to solve the handover problem between low orbit quantum satellites.When the elevation angle threshold reaches the minimum value,the handover instruction is sent from the ground service center to switch the serving?ground satellite to the next quantum satellite,which makes the satellite?ground quantum communication continuous.According to the different elevation angles,the influence of elevation angle on the quantum state survival function,channel bit error rate and channel capacity in satellite communication is analyzed,and the quantitative relationship among them is established.The simulation results show that,as the elevation angleθ=20°,the free space quantum state survival function,channel bit error rate and channel capacity are 0.56,0.033,0.5 respectively;as the elevation angleθ=70°,the free space quantum state survival function,channel bit error rate and channel capacity are 0.92,0.012,0.97 respectively,which shows that the elevation angle has a significant effect on quantum satellite communication performance.The elevation angle threshold of the satellite should be adjusted adaptively according to the requirements of different communication performances to ensure the success rate of satellite handover.

关 键 词：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 

分 类 号：TN927-34[电子电信—通信与信息系统]