Celestial：面向LEO Edge的虚拟软件系统测试平台
Celestial: Virtual Software System Testbeds for the LEO Edge
摘要：
随着SpaceX和Telesat等私营航天公司正在建造大型LEO卫星星座以提供全球宽带互联网接入，研究人员提出将计算服务嵌入卫星星座，以在LEO边缘提供计算服务。虽然LEO的优势目前还只是理论上的，但预计供应商将迅速开发他们的卫星技术，以在新的太空竞赛中占据上风。在本文中，我们回答了研究人员如何探索LEO边缘计算的可能性并在准确的运行时环境中评估任意软件系统以及具有成本效益的可扩展性的问题。为此，我们提出了天体，一个基于微虚拟机的LEO边缘的虚拟测试平台。天体可以有效地模拟单个卫星及其运动，以及地面站服务器与现实的网络条件和应用程序不可知的方式，我们的经验表明。此外，我们探讨的机会和影响，部署一个实时遥感应用程序的LEO边缘基础设施的案例研究天体。
英文摘要：
As private space companies such as SpaceX and Telesat are building large LEO satellite constellations to provide global broadband Internet access, researchers have proposed to embed compute services within satellite constellations to provide computing services on the LEO edge. While the LEO edge is merely theoretical at the moment, providers are expected to rapidly develop their satellite technologies to keep the upper hand in the new space race. In this paper, we answer the question of how researchers can explore the possibilities of LEO edge computing and evaluate arbitrary software systems in an accurate runtime environment and with cost-efficient scalability. To that end, we present Celestial, a virtual testbed for the LEO edge based on microVMs. Celestial can efficiently emulate individual satellites and their movement as well as ground station servers with realistic network conditions and in an application-agnostic manner, which we show empirically. Additionally, we explore opportunities and implications of deploying a real-time remote sensing application on LEO edge infrastructure in a case study on Celestial.
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