全球动态场景下非静止轨道通信星座干扰发生概率和系统可用性  

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

作　　者：靳瑾 李娅强 张晨 匡麟玲[1] 晏坚[1] JIN Jin;LI Yaqiang;ZHANG Chen;KUANG Linling;YAN Jian(Tsinghua Space Center,Tsinghua University,Beijing 100084,China;School of Aerospace Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学宇航技术研究中心,北京100084 [2]清华大学航天航空学院,北京100084

出　　处：《清华大学学报（自然科学版）》2018年第9期833-840,共8页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(91738101,91438206)

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。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 O3 bsystem 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.

关 键 词：卫星通信 非静止轨道(NGSO)卫星 干扰分析 建模仿真 链路夹角概率分析 

分 类 号：TN927[电子电信—通信与信息系统]