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      Occurrence probability of co-frequency interference and system availability of non-geostationary satellite system in global dynamic scene


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          With the increase in the number of non-geostationary orbit (NGSO) satellite systems, the interference between NGSO satellite systems using the same frequency has become increasingly prominent. Because of the large number and time-vary relative motion of NGSO systems, the traditional interference analysis methods and evaluation index, which are aiming for geostationary orbit (GSO) satellite systems, are no longer suitable for NGSO scene. Based on the relevant rules and recommendations of the International Telecommunication Union, this paper establishes a mathematical model of the interference analysis for non-geostationary satellite systems, and proposes a link angle probabilistic analysis method for satellite constellation interference analysis. Aiming at the complicated features such as the large number of satellites consisting of NGSO constellations and the changing temporal and spatial relationship, the scheme of NGSO constellation global interference analysis is given. The probability calculation method of harmful interference between satellite constellations and the index of satellite constellation usability are proposed. On the basis of the actual satellite network data, taking OneWeb system and O3b system as an example, the range of the link angle of the interference protection between the satellite systems is calculated. The angle of the satellite link, the interference state and the probability distribution of the availability ratio on a global scale are given, provides a means for NGSO constellation interference analysis.


          摘要 随着非静止轨道 (non-geostationary orbit, NGSO) 卫星系统数量的增加, 使用相同频率的NGSO卫星系统之间相互干扰的问题日益凸显。由于NGSO卫星系统干扰场景具有卫星数目众多和相对关系时变等特点, 因此针对静止轨道 (geostationary orbit, GSO) 卫星系统间干扰的传统仿真方法和评价体系不再适用。该文根据国际电信联盟相关的规则和建议, 建立了NGSO卫星系统干扰分析数学模型, 提出了卫星星座干扰分析的链路夹角概率分析方法; 针对NGSO卫星数目众多和时空关系时变等复杂特征给出了全球场景下NGSO全星座干扰分析的方案, 提出了星座间产生有害干扰的概率计算方法和星座可用性指标。在实际卫星网络资料的基础上, 以OneWeb系统和O3b系统为例, 计算了卫星系统间干扰保护的链路夹角限值范围, 并给出了全球范围内卫星链路夹角、干扰状态及可用性比例的概率分布结果, 为NGSO星座干扰分析提供了一种可参考的手段。

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          Author and article information

          J Tsinghua Univ (Sci & Technol)
          Journal of Tsinghua University (Science and Technology)
          Tsinghua University Press
          15 September 2018
          19 September 2018
          : 58
          : 9
          : 833-840
          [1] 1Tsinghua Space Center, Tsinghua University, Beijing 100084, China
          [2] 2School of Aerospace Engineering, Tsinghua University, Beijing 100084, China
          Copyright © Journal of Tsinghua University

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 Unported License (CC BY-NC 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by-nc/4.0/.

          Software engineering,Data structures & Algorithms,Applied computer science,Computer science,Artificial intelligence,Hardware architecture
          satellite communication,non-geostationary orbit satellite,link angle probabilitic analysis,interference analysis,modeling and simulation


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