6G will integrate the physical and digital worlds, and ubiquitous 6G service will seamlessly reach users worldwide. The concept of space-air-ground integrated networks has been proposed to integrate these three subnetworks homogenously. However, the ocean accounts for about 71 percent of the global area, and underwater networks play an important role in the defense field and the construction of the intelligent marine Internet of Things. To seize future development opportunities, this article introduces the space-air-ground-sea integrated network (SAGSIN) and related technologies, including the shape-adaptive antenna and radar-communication integration. The proposed shape-adaptive antenna is made of flexible materials, thereby allowing its physical shape to be changed in real time and for a specific radiation beam to be formed according to the functional requirements. The requirements and feasibility of radar communication integration are also analyzed comprehensively, and a detailed analysis and simulation verification are carried out for UAV detection.

中文翻译：

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6G SAGS物联网关键技术：形状自适应天线和雷达通信集成

6G 将整合物理世界和数字世界，无处不在的 6G 服务将无缝覆盖全球用户。提出了天地一体化网络的概念，以将这三个子网络同质化。然而，海洋约占全球面积的71%，水下网络在国防领域和海洋智能物联网建设中发挥着重要作用。为抓住未来发展机遇，本文介绍了天地海一体化网络（SAGSIN）及相关技术，包括形状自适应天线和雷达通信一体化。提出的形状自适应天线由柔性材料制成，从而允许实时改变其物理形状，并根据功能要求形成特定的辐射束。还综合分析了雷达通信集成的要求和可行性，并对无人机探测进行了详细的分析和仿真验证。