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基于空间隔离的低轨卫星系统频谱共享方法

张泓湜 蒋伯峰

张泓湜, 蒋伯峰. 基于空间隔离的低轨卫星系统频谱共享方法[J]. 北京航空航天大学学报, 2018, 44(9): 1909-1917. doi: 10.13700/j.bh.1001-5965.2017.0732
引用本文: 张泓湜, 蒋伯峰. 基于空间隔离的低轨卫星系统频谱共享方法[J]. 北京航空航天大学学报, 2018, 44(9): 1909-1917. doi: 10.13700/j.bh.1001-5965.2017.0732
ZHANG Hongshi, JIANG Bofeng. Spatial isolation methodology for spectral coexistence in LEO satellite systems[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(9): 1909-1917. doi: 10.13700/j.bh.1001-5965.2017.0732(in Chinese)
Citation: ZHANG Hongshi, JIANG Bofeng. Spatial isolation methodology for spectral coexistence in LEO satellite systems[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(9): 1909-1917. doi: 10.13700/j.bh.1001-5965.2017.0732(in Chinese)

基于空间隔离的低轨卫星系统频谱共享方法

doi: 10.13700/j.bh.1001-5965.2017.0732
详细信息
    作者简介:

    张泓湜  男, 博士研究生。主要研究方向:无线通信系统

    蒋伯峰  男, 博士, 教授级高工, 博士生导师。主要研究方向:无线通信系统

    通讯作者:

    蒋伯峰, E-mail: jiangbofeng@bj.xinwei.com.cn

  • 中图分类号: V412.4+1;TN927+.21

Spatial isolation methodology for spectral coexistence in LEO satellite systems

More Information
  • 摘要:

    随着业务需求的全球性增长,传统低频波段有限的频谱资源已不能满足低轨(LEO)卫星的业务承载要求,采用Ka频段的LEO星座系统设计成为了主流。然而,采用Ka频段的LEO星座系统不可避免地会对同频段已经存在的静止轨道(GEO)卫星系统产生干扰。首先,通过基于空间隔离的干扰规避方法,采用对LEO与GEO的频谱共用系统设置隔离角来进行上下行场景的干扰消除,使该LEO系统能满足国际电信联盟(ITU)对同频段内通信干扰的约束条件;然后,通过引入GEO带的概念,分析并研究了干扰规避区域的确定方法和其对LEO星座密度的影响。最后,通过仿真得出了干扰隔离角、GEO带与LEO星座密度的关系,得到了在采用隔离角的方式进行干扰避让时满足LEO星座系统业务不中断所需要的最小卫星数量,对LEO星座设计具有一定的指导意义。

     

  • 图 1  GEO带示意图

    Figure 1.  Schematic of GEO band

    图 2  LEO-GEO上行干扰场景

    Figure 2.  LEO-GEO uplink interference scenario

    图 3  LEO-GEO下行干扰场景

    Figure 3.  LEO-GEO downlink interference scenario

    图 4  αθ和地面站位置关系示意图

    Figure 4.  Schematic of relationship amongα, θand ES location

    图 5  下行场景αθ和地面站天线仰角关系示意图

    Figure 5.  Schematic of relationship among α, θ and elevation angle of ES antenna in downlink scenario

    图 6  上行场景αθ和地面站天线仰角关系示意图

    Figure 6.  Schematic of relationship among α, θand elevation angle of ES antenna in uplink scenario

    图 7  多用户上行干扰场景

    Figure 7.  Multi-user uplink interference scenario

    图 8  LEO天球规避区域示意图

    Figure 8.  Schematic of avoidance area on LEO celestial sphere

    图 9  地面站可视区域规避带示意图

    Figure 9.  Schematic of avoidance band in visible area of ES

    图 10  星座密度参数示意图

    Figure 10.  Schematic of constellation density parameters

    图 11  上行多用户干扰场景EPFD值

    Figure 11.  EPFD values of multi-user uplink interference scenario

    图 12  下行干扰场景EPFD值

    Figure 12.  EPFD values of downlink interference scenario

    图 13  αθ关系仿真结果

    Figure 13.  Relationship between α and θ in simulation

    图 14  不同θ值时星座密度参数仿真结果

    Figure 14.  Simulation result of constellation density parameter at different θ

    图 15  θ与星座卫星数量关系

    Figure 15.  Satellite amount in constellation versus θ

    表  1  仿真参数

    Table  1.   Simulation parameters

    参数 数值
    LEO轨道高度/km 850
    GEO轨道高度/km 35 786
    地球半径/km 6 371
    地面站最小仰角/(°) 10
    轨道倾角/(°) 87
    发射功率/dBw 0
    载波带宽/MHz 54
    上行频率/GHz 28
    下行频率/GHz 18.2
    LEO地面站天线口径/m 1.2
    GEO地面站天线口径/m 1
    LEO卫星天线口径/m 0.4
    GEO卫星天线口径/m 3a
    地面站天线增益 见文献[17]
    LEO卫星天线增益 见文献[18]
    GEO卫星天线增益 见文献[16]
    地面站密度/(°) 1b
    注:a.上行EPFD值对2~4区间的变化不敏感; b.设沿纬度线均匀分布,在赤道线上地面站间隔经度值为1°。
    下载: 导出CSV

    表  2  干扰门限[4]

    Table  2.   Interference threshold [4]

    干扰场景 载波频率/GHz EPFD门限/(dB(W·m-2))
    上行场景 27.5~28.6 -162
    下行场景 17.8~18.6 -164
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-11-22
  • 录用日期:  2017-12-29
  • 刊出日期:  2018-09-20

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