Research on power flux-density at the earth’s surface produced by emissions from the steerable beam of LEO constellation system

Ying HUANG; Wei LI; Chen JIAN; Kang YAN

doi:10.11959/j.issn.1000-0801.2022073

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Research on power flux-density at the earth’s surface produced by emissions from the steerable beam of LEO constellation system

Topic: Satellite Network | 更新时间：2024-06-05

- Research on power flux-density at the earth’s surface produced by emissions from the steerable beam of LEO constellation system
- Telecommunications Science Vol. 38, Issue 4, Pages: 49-58(2022)
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- DOI：10.11959/j.issn.1000-0801.2022073
  CLC： TN927.2
- Published Online：2022-04，
  
  Published：20 April 2022
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Ying HUANG, Wei LI, Chen JIAN, et al. Research on power flux-density at the earth’s surface produced by emissions from the steerable beam of LEO constellation system[J]. Telecommunications science, 2022, 38(4): 49-58.
DOI：

Ying HUANG, Wei LI, Chen JIAN, et al. Research on power flux-density at the earth’s surface produced by emissions from the steerable beam of LEO constellation system[J]. Telecommunications science, 2022, 38(4): 49-58. DOI： 10.11959/j.issn.1000-0801.2022073.

摘要

功率通量密度是评估空间业务系统保护地面业务系统的一项干扰评价指标。给出了低轨星座系统可控波束的功率通量密度的计算方法和特定可控角下功率通量密度限值的符合性判定算法。在此基础上，提出了一种基于仰角遍历的功率通量密度限值的符合性判定算法。结合低轨星座系统的特征，论证了简化最大功率通量密度计算需要满足的条件。以Starlink系统为分析场景，计算分析了其Ka/E频段馈电波束的功率通量密度，并与SpaceX公开的结果对比验证了所提方法的正确性。结果表明，Starlink系统Ka频段馈电波束到地功率通量密度在仰角低于20°时不满足《无线电规则》规定的限值要求。

Abstract

The power flux-density (PFD) is an interference criterion for protecting terrestrial service systems from space service systems.A calculation method on the PFD produced by the emissions from the steerable beam of low earth orbit (LEO) constellation system was given

and thus a compliance determination algorithm of the limits of PFD under specific steering angle was presented.On this basis

a compliance determination algorithm of the limits of PFD based on elevation traversal was proposed.Combined with the characteristics of LEO constellation system

the conditions to simplify the calculation of maximum PFD of steerable beam were demonstrated.Taking the Starlink system as the typical scenario

the PFD produced by the gateway beam was analyzed

and the correctness of the proposed method was verified by comparison with the results published by SpaceX.The results showed that the PFD of the gateway beam of the Starlink system in Ka frequency band atelevations below 20° exceeded the limits given in Radio Regulations.

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