我国沿海多岛屿，大量海域具有明显的群岛环境特征。群岛环境的海洋立体实时观测，既要有效利用多岛的海面组网便利，又要克服群岛和浅海带来的复杂水下环境，以实现空中、海面和水下联合组网。本项目提出跨空间协作动态接入和信息传输机制以实现群岛环境下空海地跨介质一体化组网。研究内容包括建立群岛环境的三维立体网络模型；在此基础上，深入研究物理层通信链路、介质访问控制等传统的单一介质网络相关内容，使其满足空海地一体化跨介质组网的要求；然后重点研究稀疏跨介质自组织网络动态接入、机会路由和传输控制等空海地组网理论；最后实现空海地一体化网络软硬件演示验证系统，选取舟山海域这一代表性群岛环境进行海试验证。本项目的空海地一体化网络研究有助于提升群岛环境下的水下、海上和空中的海洋立体观测能力，对海洋科学研究、海洋环境保护和海洋经济发展均具有重要意义。

Considerable area of sea in our country is featured with archipelago. The real-time ocean three-dimensional observations of the archipelago environment require not only effective use of the multi-island communication convenience but also overcoming the complex underwater environment brought by archipelago and shallow water in order to achieve joint air, sea and underwater networking. This project proposes a cross-space collaborative dynamic access and information transmission mechanism to realize the cross-media integrated networking under the archipelago environment. The research contents include establishing a three-dimensional network model of archipelago environment. On this basis, we further study the traditional single medium network such as physical layer communication links and media access control to meet the requirements of the integrated cross-media networking. Then, we research the theories of air-ground network such as dynamic access, opportunistic routing and transmission control of sparse cross-media ad hoc networks and finally implement the demonstration system. This project will help to enhance the ocean three-dimensional observation capability in the archipelago environment and will be of great significance to marine scientific research, environmental protection and marine economy.