随着人工智能、云计算等新兴技术的渗透赋能，卫星系统正朝着人在环路外的高度集成化、自主化、智能化方向快速发展。然而，在有限的星载感知、计算、存储、能源等资源下，单体卫星能够达到的智能化水平显著受限。同时，针对智能卫星的现有研究大多聚焦于卫星智能化或卫星组网的单一维度，对网联化智能星群的系统性研究仍显不足。为此，本文首先提出了智能星群系统的概念，该系统依托卫星组网实现多星协同智能，增强系统整体智能化水平。在此基础上，本文分析总结了智能星群系统的典型用例，并分析了这些典型用例对卫星组网提出的要求。针对上述需求，本文进一步提出面向智能星群系统的星联网（Internet of Satellites, IoS）概念，相应设计了星联网的逻辑架构与物理架构，阐述了其关键支撑技术。最后，本文介绍作者团队在关键技术研究上已取得的研究进展与代表性成果，讨论了后续研究所面临的困难与挑战。本文通过从系统的角度研究智能星群系统与面向该系统的星联网，旨在加快形成智能网联卫星技术的共识，推动相关技术的创新发展与标准化建设，提升未来大规模卫星系统的智能服务能力。

The integration of emerging technologies such as artificial intelligence and cloud computing is accelerating the development of intelligent and autonomous satellite systems. However, limitations in onboard sensing, computing, storage, and energy resources continue to constrain the intelligent functionalities of individual satellites. Currently, most studies focus on either satellite intelligence or satellite networking, while systematic studies on their integration remain scarce. To address this gap, this paper introduces the concept of an intelligent satellite cluster system, which leverages satellite networks to enable collaborative intelligence among satellites, thereby enhancing the overall system intelligence. After summarizing the typical use cases of the intelligent satellite cluster system, we analyze the corresponding demands on network capabilities. Based on these demands, we propose the concept of the Internet of satellites (IoS) tailored to support the intelligent satellite cluster system. Specifically, we design both the logical and physical architectures of IoS and elaborate on its key enabling technologies. Finally, we present the research progress and outcomes achieved by our team on these core technologies, and discuss the challenges that remain. This paper aims to build consensus around intelligent and connected satellite technologies, promote innovation and standardization, and enhance the intelligent service capabilities of future large-scale satellite systems.