海洋强国和战略资源竞争是发展海洋科技的国际大背景，国家“透明海洋”战略部署急需水下高速无线传输技术实时或及时传输海域三维立体高分辨率观测数据。目前水下声无线传感网传输距离远但速率低、功耗大、成本高、破坏海洋生态，水下光通信速率高但组网难、通信距离短。本项目拟提出一种光声融合的水下无线传感网，利用光通信实现近距离高速传输、利用声通信传输控制命令及节点定位，通过定向光传输及多跳机制实现光通信远距离传输，研究全空间覆盖的光中继器解决光通信组网难问题。本项目在物理层将实现自适应光声切换及编码调制解调，在数据链路层接入时利用光的定向传输特性引入空分多址技术提高数据传输效率，研究可提高网络生命周期并适应网络拓扑频繁变化的路由协议，研究网络能量效率评价机制和优化策略。本项目研究功耗小成本低网络健壮性强的新型无线传感网，解决海洋探测中实时视频和图像高速无线传输难题，为海洋信息探测领域提供高速传输新方案。

Marine power and competition of strategic resources are the important international background of the development of the marine science and technology, national "Transparent Ocean" strategy urgently needs the high-speed underwater wireless transmission technology to real-time or timely transmit the three-dimensional high-resolution observation data. Currently, underwater acoustic sensor networks have obtained high transmission distance, but with low date rate, high power consumption, high cost and damage to marine ecology. Meanwhile, underwater optical communications can achieve high date rate, but with difficult networking and short communication distance. This project intends to propose an optical-acoustic fusion underwater wireless sensor network, which can use the ability of optical communication to achieve high-speed transmission at close range and use the characteristics of acoustic communication to transmit control command and node localization, and achieve long-distance optical transmission through the directional optical communication and multi-hop transmission mechanism. It also intends to design the whole space optical repeater to solve the problem of difficult networking. The physical layer can realize adaptive optical-acoustic switch, code modulation and demodulation to meet the needs of different communication scenes. With the characteristics of directional optical transmission, the data link layer employs the space division multiple access technology to improve the data transmission efficiency, designs a routing protocol to improve the network life cycle and adapt to the network topology changes frequently, and provides the analysis of the network energy efficiency and the optimization strategy. With the advantages of low power consumption, low cost, and strong network robust, the proposed system will solve the high-speed wireless transmission problem of real-time video images in marine exploration and provide new solutions for the high-speed transmission of marine information detection.