The development of integrated space-air-ground network (SAGIN) requires sophisticated satellite Internet emulation tools that can handle complex, dynamic topologies and offer in-depth analysis. Existing emulation platforms struggle with challenges like the need for detailed implementation across all network layers, real-time response times, and the ability to scale. Plotinus, a new digital twin system based on microservices for satellite Internet emulation, aims to solve these problems. It features a modular design, allowing for easy replacement of the physical layer to emulate different aerial vehicles and analyze channel interference. It also enables the replacement of path computation methods to simplify testing and deploying algorithms. In particular, Plotinus allows for real-time emulation with live network traffic, enhancing the realism of network models. Evaluation result shows that Plotinus's effective emulation of dynamic satellite networks with real-world devices. Its adaptability for various communication models and algorithm testing highlights Plotinus's role as a vital tool for developing and analyzing SAGIN systems, offering a scalable, real-time response, and flexible digital twin system.

翻译：空天地一体化网络（SAGIN）的发展需要能够处理复杂动态拓扑并提供深度分析的卫星互联网仿真工具。现有仿真平台面临诸多挑战，如需要跨所有网络层进行详细实现、达到实时响应时间以及具备可扩展性。基于微服务架构的新型卫星互联网数字孪生系统Plotinus旨在解决这些问题。该系统采用模块化设计，可灵活替换物理层以仿真不同飞行器并分析信道干扰，同时支持替换路径计算方法以简化算法的测试与部署。特别地，Plotinus能够通过实时网络流量实现动态仿真，从而增强网络模型的真实性。评估结果表明，Plotinus能够有效仿真使用真实设备的动态卫星网络。其在多种通信模型与算法测试中的适应性，凸显了Plotinus作为开发和评估SAGIN系统关键工具的价值——提供了一种可扩展、实时响应且灵活的数字孪生系统。