| 摘要: |
| 针对低轨卫星互联网系统架构，聚焦该系统的鲁棒性分析，利用复杂系统理论中的级联失效模型，结合低轨卫星互联网的系统结构与运行机制，构建了面向控制-通信相依网络的失效传播模型。针对系统特征，提出了最大连通子图比例与归一化网络效能两项鲁棒性评价指标，并通过仿真实验验证指标的合理性。研究结果表明，相依节点连接策略选择同配连接（Assortative Linking，AL）时，系统整体鲁棒性优于随机连接（Random Linking，RL）和异配连接（Disassortative Linking，DL）；降低相依网络间节点的固定耦合依赖系数，可使系统在遭受外部攻击后提升系统最大连通子图比例，提高系统的抗毁性；若控制网恢复系数提高至0.6以上，且节点受攻击比例处于0.5~0.6区间时，系统归一化网络效能指标可提升100%~130%。 |
| 关键词: 低轨卫星互联网 级联网络 鲁棒性分析 复杂网络分析 网络效能 连接策略 |
| DOI：10.20079/j.issn.1001-893x.250228001 |
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| 基金项目:教育部第二批新工科研究与实践项目(E-XTYR20200661)；四川省科技成果转移转化示范项目（2024ZHCG0046）； |
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| Robustness Analysis of Low Earth Orbit Satellite Internet System Architecture Based on Cascade Networks |
| WU Jianguang,YAO Yuanfei,CAI Fangkai |
| (School of Network & Communication Engineering，Chengdu Technological University，Chengdu 611730，China) |
| Abstract: |
| For the system architecture of low Earth orbit（LEO） satellite Internet，with focus on the robustness analysis of this system，a failure propagation model for control-communication interdependent networks is constructed by applying the cascading failure model in complex system theory and the structure and operation mechanism of LEO satellite Internet.According to the system characteristics，two robustness evaluation metrics，the ratio of maximum connected subgraph and normalized network performance,are proposed,and the rationality of the metrics is verified through simulation experiments.The results show that:①When adopting assortative linking(AL) for interdependent node connection strategies，the system demonstrates superior overall robustness compared with random linking(RL) and disassortative linking(DL)；②Reducing the fixed coupling dependency coefficient between interdependent networks will increase the ratio of maximum connected subgraph under external attacks，significantly improving the system’s survivability；③When the control network recovery coefficient is exceeded above 0.6 and the node attack proportion ranges between 0.5 and 0.6，the normalized network efficiency metric shows 100% |
| Key words: LEO satellite Internet cascade network robustness analysis complex network analysis network efficiency connection strategy |
《电讯技术》编辑部 