Design of a Hybrid Multi-layer Satellite Backbone Network Architecture
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摘要: 卫星骨干网络将向宽带与中继融合方向发展，为陆、海、空、天基用户提供全球骨干传输、宽带接入、全域通联等服务。该文针对全域用户通联的新需求，创新采用“卫星骨干网络/全域用户接入”模型，提出一种具有层内、层间星间链路的中高轨混合的多层卫星骨干网络架构(3GEO+3IGSO/24MEO)。对该架构的全域覆盖性计算分析，得出该多层卫星骨干网络能够实现地球表面到地球同步轨道高度(约36000 km)全域100%覆盖，并为全域用户提供多重接入能力。进一步对路径数、最少跳数、最小时延等关键网络性能指标分析比较，说明了该架构中轨卫星与高轨卫星之间存在层间星间链路的必要性。分析结果表明：该架构能够满足全域宽带接入和全球骨干传输的需求。Abstract: The space-based backbone transmission network will develop in the direction of broadband and relay integration, providing services such as global backbone transmission, broadband high-speed access and heterogeneous network interconnection for land, sea, air and space users. According to the service requirements of different users, a multi-layer satellite backbone network architecture for medium and high orbit (3GEO+3IGSO/24MEO) is proposed to use the "Satellite Backbone Network/All-Domain Users Access" model. Through the calculation and analysis of the spatial coverage of the architecture, it is concluded that the multi-layer satellite network can achieve 100% coverage of the whole airspace from the earth's surface to the Geostationary Earth Orbit altitude (about 36000 km), and provide multiple access capabilities for All-Domain users. Furthermore, through the analysis and comparison of the key network performance indicators such as path numbers, minimum hops and delay, the necessity of the existence of inter satellite links between medium orbit satellites and high orbit satellites in the architecture is proved. The analysis results show that the architecture can satisfy the broadband access and backbone transmission needs of all kinds of users in the whole airspace.
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表 1 各轨道星座参数
轨道类型 卫星数 轨道面 轨道高度(km) 轨道倾角(°) 轨位 平近点角 GEO 3 1 ～36000 0 定点于110°E,11°W,130°W – IGSO 3 1 ～36000 65 升交点经度145°E,25°W,95°W – MEO 24 3 20000 55 – 每个轨道上首颗卫星初始时刻平近点角分别为
0°, 15°, 30°，其余依次增加45°
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表 2 3种卫星网络的覆盖率(%)
时间 高度 0 km 1000 km 20000 km 36000 km 高轨层 中轨层 多层 高轨层 中轨层 多层 高轨层 中轨层 多层 高轨层 中轨层 多层 6:00 100 100 100 100 100 100 100 100 100 100 100 100 12:00 100 100 100 100 100 100 100 100 100 100 100 100 18:00 100 100 100 100 100 100 100 100 100 100 100 100 24:00 100 100 100 100 100 100 100 100 100 100 100 100
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表 3 典型应用场景
场景1 场景2 场景3 场景4 场景5 场景6 场景7 场景8 场景9 场景10 源节点 高轨用户 高轨用户 高轨用户 高轨用户 中轨用户 中轨用户 中轨用户 低轨用户 低轨用户 地面用户 目的节点 高轨用户 中轨用户 低轨用户 地面用户 中轨用户 低轨用户 地面用户 低轨用户 地面用户 地面用户
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